Hence, we can write:1.9 kN > RCD⇒ 1.9 kN > 4.1 kN - P⇒ P < 4.1 kN - 1.9 kN⇒ P < 2.2 kN
Therefore, the maximum load P that can be applied to the truss is P < 2.2 kN.So, the greatest load that can be applied to the truss in Figure 1 is 2.2 kN.
Given Data:Maximum tension load that each bar can bear = 2.2 kN Maximum compressive load that each bar can bear = 1.9 kNTo find:The greatest load P that can be applied to the truss in Figure 1
Approach:First of all, we need to find the bar which is subjected to maximum tension or compression force.Then, we can calculate the maximum load that the bar can bear.Using the method of joints, we can find the load in each bar of the truss.Finally, we can compare the load in each bar with the maximum load that it can bear, to find the maximum load P that can be applied to the truss.
Calculation:First, we will find the bar which is subjected to maximum tension or compression force.We can see that the bars AD and CD will have maximum tensile and compressive forces respectively in bar AD and CD.Using the method of joints,
we can calculate the force in each bar:∑Fy = 0⇒ RCD + RDA = P⇒ RDA = P - RCD∑FCD = 0⇒ RCD - 2.2 - 1.9 = 0⇒ RCD = 4.1 kNSo, we have found the force in bar DA as:RDA = P - RCDWe know that bar AD can bear a maximum load of 2.2 kN in tension. Hence, we can write:2.2 kN > RDA⇒ 2.2 kN > P - RCD⇒ P < RCD + 2.2 kN⇒ P < 4.1 + 2.2 kN = 6.3 kNWe also know that bar CD can bear a maximum load of 1.9 kN in compression.
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what happens after the helium flash in the core of a star?
After the helium flash in a star, the core quickly heats up and expands.
A helium flash is the very brief thermal runaway nuclear fusion of significant amounts of helium into carbon during the red giant phase of low mass stars (between 0.8 solar masses (M) and 2.0 M). The centre expands as a result of the core becoming warmer as a result of this.
Following the onset of helium nuclear reactions in a star's core, helium nuclei fuse to create carbon and oxygen.
Most of the time, the stars' positions in reference to one another remain constant. Convergence between Orion and Taurus is ongoing. Ursa Minor is never far from Draco. The stars appear to us as an endless backdrop painting in the sky that hardly moves in reference to one another.
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Help asaaap it's about doppler effect
The frequency that the bad guy hear is 12000 hz when the police car is moving with speed of 80m/s.
Frequencyfo=fs(vvov), where fo is the observed frequency, fs is the source frequency, v is the speed of sound, vo is the observer's speed, the top sign indicates the observer is approaching the source, and the bottom sign indicates the observer is leaving the source.Equation fo=800(80-65) fo = 12000 after substituting the variablesThe apparent change in frequency of a wave as a result of an observer moving with respect to the wave source is known as the Doppler effect or Doppler shift. It bears the name of the Austrian physicist Christian Doppler, who first described the phenomenon in 1842.For more information on doppler effect kindly visit to
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Which term describes the energy an object has due to the motion of its
particles?
A. Magnetic energy
B. Chemical energy
C. Elastic energy
D. Thermal energy
Answer: The answer is D. Thermal Energy.
Explanation:
Thermal energy is a type of kinetic energy owing to the fact that it results from the movement of particles.
a waterbed heater uses 450 w of power. it is on 35 % of the time, off 65 % . part a what is the annual cost of electricity at a billing rate of $0.13 per kwhr ? express your answer using two significant figures.
The annual cost of electricity at a billing rate of $0.13 per kWhr for a waterbed heater that uses 450 W of power is $36.51.
What is the usage of the waterbed heater in a day?For the calculation of the energy consumed, one must know the energy consumed by the heater per day. The energy consumed in one day can be calculated by multiplying the power consumed by the hours the heater is used. The power consumed by the heater is 450 W.
The heater is used 35% of the time and is off 65% of the time. The percentage of time the heater is used is calculated using the formula:
Percentage of time the heater is used = (Time heater is on/Total time) × 100
Percentage of time the heater is used = (35/100) × 100
Percentage of time the heater is used = 35%
The percentage of time the heater is off is calculated using the formula:
Percentage of time the heater is off = (Time heater is off/Total time) × 100
Percentage of time the heater is off = (65/100) × 100
Percentage of time the heater is off = 65%
Thus, the heater is used for 8.4 hours per day (i.e., 24 hours × 35%) and is off for 15.6 hours per day (i.e., 24 hours × 65%).
The energy consumed per day can be calculated by multiplying the power consumed by the time the heater is on. Energy consumed per day = Power consumed × Time heater is on
Energy consumed per day = 450 W × 8.4 hours
Energy consumed per day = 3780 Wh
Energy consumed per day = 3.78 kWh
The annual cost of electricity can be calculated by multiplying the energy consumed per year by the cost of electricity per kWh.
Annual cost of electricity = Energy consumed per year × Cost of electricity per kWh
Annual cost of electricity = 3.78 kWh × $0.13/kWh
Annual cost of electricity = $0.4914/day
Annual cost of electricity = $179.31/year
Hence, the annual cost of electricity at a billing rate of $0.13 per kWhr for a waterbed heater that uses 450 W of power is $36.51.
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A straight 2.40 m wire carries a typical household current of 1.50 A (in one direction) at a location where the earth's magnetic field is 0.550 gauss from south to north. *I know there's a lot of questions, but I will rate the you-know-what out of you a) Find the direction of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running from west to east. b) Find the magnitude of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running from west to east. c) Find the direction of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running vertically upward. d) Find the magnitude of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running vertically upward. e) Find the direction of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running from north to south. f) Find the magnitude of the force that our planet's magnetic field exerts on this cord if is oriented so that the current in it is running from north to south. g) Is the magnetic force ever large enough to cause significant effects under normal household conditions?
a) If the current is running from west to east, the force that our planet's magnetic field exerts on this cord is directed upwards
b) The magnitude of the force that our planet's magnetic field exerts on this cord if it is oriented so that the current in it is running from west to east is F =2.64 x 10^-4 N
c) If the current is running vertically upward, the force that our planet's magnetic field exerts on this cord is directed to the left. west
d) The magnitude of the force that our planet's magnetic field exerts on this cord if it is oriented so that the current in it is running vertically upward is F = 0 zero
e) If the current is running from north to south, the force that our planet's magnetic field exerts on this cord is directed east.
f) The magnitude of the force that our planet's magnetic field exerts on this cord if it is oriented so that the current in it is running from north to south is F = 2.64 x 10^-4 N
g) The magnetic force is not large enough to cause significant effects under normal household conditions.
EXPLANATION
a) The direction of the force that our planet's magnetic field exerts on the cord is perpendicular to both the direction of the current and the direction of the magnetic field, according to the right-hand rule. In this case, if the current is running from west to east, and the magnetic field is from south to north, the force will be directed upwards.
b) The magnitude of the force can be calculated using the formula:
F = BIL sin(theta)
where B is the magnitude of the magnetic field, I is the current, L is the length of the wire, and theta is the angle between the direction of the current and the direction of the magnetic field. In this case, theta is 90 degrees, so sin(theta) = 1. Substituting the given values, we get:
F = (0.550 x 10^-4 T) x (1.50 A) x (2.40 m) x 1
= 2.64 x 10^-4 N
Therefore, the magnitude of the force is 2.64 x 10^-4 N.
c) If the current in the wire is running vertically upward, the force will be directed towards the west.
d) Using the same formula as in part (b), we can calculate the magnitude of the force:
F = (0.550 x 10^-4 T) x (1.50 A) x (2.40 m) x sin(90)
= 0
Therefore, the magnitude of the force is zero.
e) If the current in the wire is running from north to south, the force will be directed towards the east.
f) Using the same formula as in part (b), we can calculate the magnitude of the force:
F = (0.550 x 10^-4 T) x (1.50 A) x (2.40 m) x 1
= 2.64 x 10^-4 N
Therefore, the magnitude of the force is 2.64 x 10^-4 N.
g) The magnitude of the magnetic force in this case is quite small, and under normal household conditions, it is unlikely to cause significant effects. However, in some situations, such as in electrical power transmission systems, the effects of the magnetic force may need to be taken into account.
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A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is:
(A) more than the speed it had when thrown upwards.
(B) the same as the speed it had when thrown upwards.
(C) less than the speed it had when thrown upwards.
A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is C. less than the speed it had when thrown upwards.
When a ball is thrown upwards, it gains kinetic energy due to the force exerted by the thrower. Then, as it ascends, it loses kinetic energy and gains potential energy as it moves higher up. Finally, the ball comes to a stop, its kinetic energy becoming zero, and its potential energy reaches its maximum value. At the top, the ball begins to fall back to the ground.The air resistance opposes the motion of the ball, slowing it down as it travels upwards.
When the ball starts coming back down, the air resistance exerts an additional force, which slows down the ball and reduces its speed. As a result, the speed with which it is caught is less than the speed it had when thrown upwards. Hence, option (C) is correct.
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Which of the following correctly compares the Sun's energy generation process to the energy generation process in human-built nuclear power plants?
Both processes involve nuclear fusion, but the Sun fuses hydrogen while nuclear power plants fuse uranium.
The Sun generates energy by fusing small nuclei into larger ones, while our power plants generate energy by the fission (splitting) of large nuclei.
The Sun generates energy through nuclear reactions while nuclear power plants generate energy through chemical reactions.
The Sun generates energy through fission while nuclear power plants generate energy through fusion.
The correct comparison of the energy generation processes is "The Sun generates energy by fusing small nuclei into larger ones, while our power plants generate energy by the fission (splitting) of large nuclei". Thus, the correct options are A and B.
What is Nuclear power?Nuclear reactions involve the alteration of an atom's nucleus in both cases. Nuclear power plants and the sun both use energy generated by these nuclear reactions to produce electricity. The difference is in the type of nuclear reaction that takes place.
In the Sun, nuclear fusion is the process by which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy. The energy produced in this way is what makes the Sun so hot and bright. In a nuclear power plant, nuclear fission is the process by which the nucleus of an atom is split into two smaller nuclei.
The energy that is released in the process is used to heat water, creating steam that drives a turbine, which in turn drives a generator to produce electricity.
Therefore, the correct options are A and B.
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a density bottle has a mass of 0.04kg when empty a mass of 0.20kg when some quality of steel ball bearing is added to it and a mass of 0.24kg when the remainder of the bottle is filled with water. if the density bottle weight 0.1kg when filled with water. calculate the relative density of the steel ball bearing.
Answer:
Bottle = .04
Bottle + Bearing = .20
Bottle + Bearing + Water = .24
Bottle + Water = .1
Full bottle of water weighs = .06
Weight of bearing = .16
What volume of water does the bearing replace????
It takes .14 of bottle to replace bearing leaving .06 of water
Density = 16 / 6 = 2.67
Check: probably should use volumes
write the equations for the balance of the forces in the horizontal and vertical directions for block a and for block b (four equations). start with the force exerted on block a in the horizontal direction.
The equations for the balance of forces in the horizontal and vertical directions for Block A and Block B are: Horizontal direction of Block A: T = 12.5 N,Vertical direction of Block A: W = 24.5 N,Horizontal direction of Block B: T = 22.5 N and Vertical direction of Block B: W = 44.1 N.
The forces acting on Block A are: Force of tension (T) and Force of gravity (W).The forces acting on Block B are: Force of tension (T) and Force of gravity (W).For Block A in the horizontal direction, the force exerted will be the force of tension (T).
Therefore: Horizontal direction of Block A: T = mA a ………………….. (1) For Block A in the vertical direction, the force exerted will be the force of gravity (W).
Therefore: Vertical direction of Block A: W = mA g ………………….. (2) For Block B in the horizontal direction, the force exerted will also be the force of tension (T).
Therefore: Horizontal direction of Block B: T = mB b ………………….. (3) For Block B in the vertical direction, the force exerted will be the force of gravity (W).
Therefore: Vertical direction of Block B: W = mB g ………………….. (4)
The equations can be solved by substituting the values of the masses and the acceleration due to gravity. Therefore, equations (1) to (4) will become:
Horizontal direction of Block A: T = 2.5 (5) = 12.5 N Vertical direction of Block A: W = 2.5 (9.8) = 24.5 N Horizontal direction of Block B: T = 4.5 (5) = 22.5 N Vertical direction of Block B: W = 4.5 (9.8) = 44.1 N
Therefore, the equations for the balance of forces in the horizontal and vertical directions for Block A and Block B are:
Horizontal direction of Block A: T = 12.5 N Vertical direction of Block A: W = 24.5 N Horizontal direction of Block B: T = 22.5 N Vertical direction of Block B: W = 44.1 N
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True or False: For a given water velocity (distance traveled per unit time), the greater the cross sectional area of a stream channel, the lower will be the stream flow (discharge: volume of water per unit time).
For a given water velocity (distance traveled per unit time), the greater the cross-sectional area of a stream channel, the lower will be the stream flow (discharge: volume of water per unit time)" is a false statement.
What is Stream discharge?Stream discharge is measured by the volume of water flowing per unit of time, which is calculated by multiplying the stream's cross-sectional area (flow width × flow depth) by its water velocity. As a result, the given statement is false.
According to the formula, an increase in the cross-sectional area of the stream will cause a rise in the stream flow (discharge: volume of water per unit time) because it is multiplied by the velocity. So, for a given water velocity, the greater the cross-sectional area of a stream channel, the higher the stream flow (discharge: volume of water per unit time) will be.
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a student pulls a 1500 kg suitcase along a flat sidewalk. if the cord on the suitcase breaks when the force is greater than 50n, what is the maximum acceleration that the student can achieve with the suitcase?
The maximum acceleration that the student can achieve with the 1500 kg suitcase is 50N/1500kg = 0.033 m/s2.
Acceleration is the change in velocity per unit time. Acceleration is a vector quantity that has both magnitude and direction. Acceleration is divided into deceleration acceleration and acceleration acceleration. Acceleration decreases meaning the direction of acceleration is opposite to the direction of velocity.
To calculate the maximum acceleration, we can use the following equation:
Force = Mass x Acceleration. Therefore, 50N = 1500kg x Acceleration
Solving for Acceleration, we get 50N/1500kg = 0.033 m/s2.
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Select the correct location on the image.
The image shows the visible light spectrum received from a star. Which three parts of the spectrum show the presence of elements in the star’s atmosphere?
The visible light spectrum is the range of wavelengths the human eye can detect, ranging from 380 to 700 nanometers.
What are visible light examples?People think of the sun, light bulbs, candles, and flames when they think of light, but visible light originates from many sources and in many hues. Other visible light sources include television and computer displays, glow sticks, and pyrotechnics.
This is why this area of the electromagnetic spectrum is known as the visible spectrum or colour spectrum. It primarily comprises of seven colours: violet, blue, green, yellow, orange, and red.
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Answer:
It is the three spots where there are lines. Between 400 and 500(the two lines), between 600 and 700(the two lines), and the one line between 700 and 800.
The electric flux through a spherical surface is4.3×104 N⋅m2/C. What is the net charge enclosed by the surface? The net charge enclosed by the surface isμC. The electric flux through a cubical box34 cmon a side is7.5×103 N⋅m2/C. What is the total charge enclosed by the box? The total charge enclosed by the box isμC
For the electric flux through a spherical surface is 4.3 x 10⁴ N⋅m²/C, then the net charge enclosed by the surface is μC, and for the electric flux through a cubical box 34 cm on a side is 7.5 x 10³ N⋅m²/C, the total charge enclosed by the box is μC.
The electric flux through a spherical surface is 4.3 x 10⁴ N⋅m²/C.
The net charge is Electric Flux = Charge / Surface Area,
so the net charge enclosed is 4.3 x 10⁴ / (4πr²) where r is the radius of the sphere.
Therefore, the net charge enclosed by the surface is μC.
The electric flux through a cubical box 34 cm on a side is 7.5 x 10³ N⋅m²/C.
The total charge is Electric Flux = Charge / Surface Area,
so the total charge enclosed is 7.5 x 10³ / (6a²)
where a is the length of one side of the cube.
Therefore, the total charge enclosed by the box is μC.
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Somewhat paradoxically, new parents report _____ marital satisfaction and _____ love for each other. less; more.
Somewhat paradoxically, new parents report less marital satisfaction and more love for each other. This statement may seem contradictory at first glance, but it is entirely reasonable when we examine it more closely.
Marriage satisfaction refers to the degree of satisfaction that a person derives from being in a relationship with their partner. It is essential to comprehend that the satisfaction levels may fluctuate over time, and external factors such as parenthood may influence the levels.
Parenthood, on the other hand, is characterized by the arrival of a new member into the family. As a result, new parents are required to balance and divide their time between their relationship and their child. This task is challenging and can take a significant toll on the couple's relationship, resulting in reduced marital satisfaction levels.On the other hand, the arrival of a new baby also brings an immense amount of joy and love into the couple's life.
The couple's love and affection for each other may intensify due to the shared experience of bringing a new life into the world. As a result, new parents may report more love for each other despite a decrease in marital satisfaction levels.In conclusion, new parents may report less marital satisfaction but more love for each other due to the challenges and demands of parenthood. Despite the challenges, parenthood may also bring an immense amount of love and joy into the couple's life.
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a suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 2.00 s. then security agents appear, and the man runs as fast as he can back along the sidewalk to his starting point, taking 12.6 s. what is the ratio of the man's running speed to the sidewalk's speed?
The ratio of the man's running speed to the sidewalk's speed is 6.3.
To solve the problem, we can start by using the formula:
distance = speed × time
Let's assume that the length of the moving sidewalk is L, and the speed of the man is v and the speed of the sidewalk is u.
When the man runs along the sidewalk from one end to the other, his speed relative to the ground is (v + u), and the distance he covers is L. Therefore, we have:
L = (v + u) × 2.00 s
When the man runs back along the sidewalk to his starting point, his speed relative to the ground is (v - u), and the distance he covers is also L. Therefore, we have:
L = (v - u) × 12.6 s
Now we can solve for v/u by dividing the two equations:
(v + u)/(v - u) = 2.00/12.6
Solving for v/u gives:
v/u = (2.00/12.6 + 1)/(2.00/12.6 - 1) = 6.3
Therefore, the ratio of the man's running speed to the sidewalk's speed is 6.3.
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a flat, circular loop has 17 turns. the radius of the loop is 12.5 cm and the current through the wire is 0.60 a. determine the magnitude of the magnetic field at the center of the loop (in t).
The magnetic field at the center of the loop is calculated to be 0.159 T.
The magnetic field at the center of a flat, circular loop with 17 turns, a radius of 12.5 cm, and a current of 0.60 A can be determined by using the equation B = µ₀.n.I/2.π.r, where
B is the magnitude of the magnetic field, µ₀ is the permeability of free space, n is the number of turns, I is the current, and r is the radius of the loop.Using this equation, the magnetic field at the center of the loop is calculated to be 0.159 T.
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Given the definition of EER, find the EER of an 8000 Btu/hour air conditioner that requires a power input of 1500 W. Express your answer numerically in British thermal units per hour per watt. EER = __________(Btu/hour)/W
EER is defined as the Energy Efficiency Ratio which is the ratio of cooling capacity in BTU/hr to the power input in watts.
The EER of the given 8000 Btu/h air conditioner is 5.33 Btu/hour per watt.
In the case of the given 8000 Btu/h air conditioner that requires a power input of 1500 W, the EER can be calculated as follows:
EER = (cooling capacity in Btu/hr) / (power input in watts)
EER = 8000 Btu/hour / 1500 W = 5.33 Btu/hour per wat.
Energy efficiency ratio (EER) is used in the USA and is defined as the system output in Btu/h per watt of electrical energy.
Coefficient of performance (COP) is the equivalent measure using SI units, which is widely used in the UK. A COP of 1.0 equates to an EER of 3.4.
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open the experiment file containing your pressure-temperature data. make sure that your graph displays temperature on the horizontal axis. if the relationship between pressure and temperature appears to be linear, fit a line to your data. if not, take the necessary steps to obtain a linear relationship. 2. is it correct to state that the pressure is proportional to the celsius temperature; i.e., does a doubling of the temperature produce a doubling of the pressure? if not, then manipulate your graph (logger pro) or use your equation to determine the celsius temperature at which the pressure of a gas should drop to zero. your instructor may guide you in this process. compare your experimental value to the accepted value for this temperature. 3. write a statement relating pressure to the absolute temperature of a gas.
The absolute temperature is determined by the Kelvin scale, which is the sum of the Celsius temperature and 273.15.
What is a temperature scale?A temperature scale is a system used to measure and quantify the degree of hotness or coldness of an object or substance. It defines a set of numerical values that correspond to specific temperatures, which can be used to compare temperatures and measure changes in temperature over time.
To open the experiment file containing your pressure-temperature data, first launch the Logger Pro software. From there, you can access your file and adjust the graph's axes accordingly. If the data appears to follow a linear relationship, then fit a line to the data by clicking on the Linear Fit option from the Analyze menu. If the data does not appear to follow a linear relationship, take the necessary steps to adjust the graph and obtain a linear relationship.
It is not correct to state that the pressure is proportional to the Celsius temperature. Pressure increases as temperature increases, but it is not a linear relationship. To find the temperature at which the pressure of a gas should drop to zero, you can either manipulate the graph or use the equation to determine the Celsius temperature. Once you have obtained the temperature, compare it to the accepted value for this temperature.
The pressure of a gas is proportional to the absolute temperature of a gas. The absolute temperature is determined by the Kelvin scale, which is the sum of the Celsius temperature and 273.15.
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a 35.0-g bullet moving at 475 m/s strikes a 4.4-kg bag of flour that is on ice, at rest. the bullet passes through the bag, leaving at 220 m/s. how fast is the bag moving when the bullet exits?
When the 35.0-g bullet moving at 475 m/s strikes the 4.4-kg bag of flour, the momentum of the bullet is transferred to the bag of flour, causing the bag of flour to move and the bag moving when the bullet exits at 91.3 m/s.
What is the speed of bag moving when the bullet exits?We can calculate the velocity of the bag of flour after the collision using conservation of momentum:
Here we have the following data as :
Momentum of bullet before collision = Momentum of bullet and bag after collision
m bullet × v bullet, before = (m bullet + m bag) bag × v bag, after
We can solve for v bag ,after:
v bag ,after = (m bullet × v bullet, before) / (m bullet + m bag)
v bag, after = (35.0 g × 475 m/s) / (35.0 g + 4.4 kg) = 91.3 m/s
Therefore, the bag of flour is moving at 91.3 m/s when the bullet exits.
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The half life of a radioactive substance is 5 hours. If 5g of the substance is left after 20 hours, determine the original mass of the substance
Answer:
The original mass of the substance was 10g.
Explanation:
The half-life of a radioactive substance is the amount of time it takes for half of the substance to decay. In this case, the half-life is 5 hours.
We can use the half-life formula to find the original mass of the substance:
N = N0 * (1/2)^(t/T)
where:
---N0 is the initial mass of the substance
---N is the remaining mass of the substance after time t
---T is the half-life of the substance
We know that after 20 hours, only half of the substance remains:
N = N0 * (1/2)^(20/5) = 0.5 * N0
If we solve for N0, we get:
N0 = N / 0.5 = 5g / 0.5 = 10g
Therefore, the original mass of the substance was 10g.
the three bins represent three important properties of stars. What are the items that we must measure in orrder to determine each property into the three bins.
Luminosity ________
Surface Temperature________ Mass________
To determine each property in the three bins, certain items must be measured. The luminosity, surface temperature, and mass are the three important properties of the stars represented by three bins.
The measurement for each property is as follows:
For luminosity: To measure luminosity, we must measure the total amount of energy a star emits in all wavelengths.
For surface temperature: Surface temperature is determined by analyzing the spectrum of light emitted by the star.
The spectrum shows a rainbow of colors, and some colors will be more intense than others. These colors can be used to estimate the temperature of the star's surface.
For mass: Mass is calculated using observations of how the star interacts with its surroundings. Astronomers observe the gravitational effect that a star has on other objects around it. The mass of a star can be estimated using this method.
Stars are gigantic balls of burning gas that light up the sky and heat up planets around them. The sun is a star, for example.
Some stars are smaller and some are larger, but all of them share the same basic structure. The enormous nuclear furnace at the center of every star produces heat and light through fusion.
Stars are made up of mostly hydrogen and helium, but they contain small amounts of other elements. They are classified into three categories based on their luminosity, surface temperature, and mass.
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A small block with mass 0.0400 kg slides in a vertical circle of radius R = 0.500 m on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, point A, the normal force exerted on the block by the track has magnitude 3.95 N. In this same revolution, when the block reaches the top of its path, point B, the normal force exerted on the block has magnitude 0.680 N. How much work is done on the block by friction during the motion of the block from point A to point B?
The work done on the block by friction during the motion of the block from point A to point B is 2.49 J.
The normal force acting on the block at point A and point B is different. We can find the weight of the block at points A and point B using the following formula:
Weight = mg,
where m is the mass of the block and g is the acceleration due to gravity.
Weight at point A = m × g
Weight at point B = m × g
Now, the normal force acting on the block at point A is given as 3.95 N.
Therefore, we can write the equation for the weight and normal force as:
Weight at point A - Normal force at point A = m × a
Now, at point A, the acceleration acting on the block is the centripetal acceleration a = v²/R where v is the velocity of the block at point A.
We can write the equation for the weight and normal force as:
m × g - 3.95 = m × v²/R
Similarly, at point B, we can write the equation for the weight and normal force as:
m × g - 0.680 = m × v²/R
Now, we can solve both the equations for the velocity of the block at point A and point B:
Velocity at point A, v₁ = √(gR - 3.95/m)
Velocity at point B, v₂ = √(gR - 0.680/m)
The change in kinetic energy during the motion from point A to point B is given by:
∆KE = KE₂ - KE₁
= (1/2)mv₂² - (1/2)mv₁²
We know that work done, W = ∆KE
So, the work done on the block by friction during the motion of the block from point A to point B is given by:
W = (1/2)m(v₂² - v₁²)
Substituting the values in the above equation:
W = (1/2) × 0.0400 × ((√(9.81 × 0.500 - 0.680/0.0400))² - (√(9.81 × 0.500 - 3.95/0.0400))²)
W = 2.49 J
Therefore, the work done on the block by friction is 2.49 J.
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in one cycle a heat engine absorbs 480 j from a high-temperature reservoir and expels 320 j to a low-temperature reservoir. if the efficiency of this engine is 56% of the efficiency of a carnot engine, what is the ratio of the low temperature to the high temperature in the carnot engine?
The ratio of the low temperature to high temperature of the Carnot engine is 2.38.
What is the efficiency of Carnot engine?The efficiency of the Carnot engine can be defined as the ratio of network done per cycle by the engine to the heat energy absorbed by the engine per cycle by the working substance from the source.
Efficiency = 1 - (Tlow/Thigh)
Heat absorbed by engine = 480J
Heat expelled by engine = 320J
Efficiency of the engine = 56% of efficiency of Carnot engine
The ratio of low temperature to high temperature in the Carnot engine.
Let's assume the efficiency of the Carnot engine is 'ηc' = 1 - T₂/T₁
Where, T₂ = Low temperature and T₁ = High temperature
To calculate the efficiency of the engine given, η = (Q1 - Q2)/Q1
η = (480 - 320)/480
η = 160/480
η = 1/3
η = 33.33%
Now, η = 56% × ηc
0.56ηc = 1/3ηc = (1/3)/0.56 = 0.58
As we already know, ηc = 1 - T₂/T₁
T₂/T₁ = 1 - ηc
T₂/T₁ = 1 - 0.58
T₂/T₁ = 0.42
T₁/T₂ = 1/0.42
T₁/T₂ = 2.38
Therefore, the ratio of low temperature to high temperature in the given Carnot engine with an efficiency of 56% will be about 2.38.
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write an expression for the magnitude of the force, f, exerted on the firefighter by the pole. answer in terms of the variables from the problem statement as well as g for the acceleration due to gravity.
The expression for the magnitude of the force exerted on the firefighter by the pole can be expressed as F = mg + ma.
Where m is the mass of the firefighter,
g is the acceleration due to gravity, and
a is the acceleration of the pole
In order to find an expression for the magnitude of the force, F, exerted on the firefighter by the pole, we need to consider the forces acting on the firefighter.
According to Newton's second law of motion, the force acting on an object is equal to its mass multiplied by its acceleration. In this case, the forces acting on the firefighter are the gravitational force, which is pulling the firefighter downwards with a force of mg, and the force exerted on the firefighter by the pole, which is pushing the firefighter upwards with a force of ma. Therefore, the total force acting on the firefighter is given by the sum of these two forces, which is: F = mg + ma
Thus, this expression gives us the magnitude of the force exerted on the firefighter by the pole. Here, m is the mass of the firefighter, g is the acceleration due to gravity, and a is the acceleration of the pole. if the pole is not accelerating (i.e., if a = 0), then the expression reduces to F = mg, which is the gravitational force acting on the firefighter.
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Which of the following statements are true? Choose all that apply.- The magnetic force is always perpendicular to both the magnetic field and the velocity of the charge .- Magnetic fields cause charges to speed up.- Magnetic fields are created by moving charges.- Magnetic fields don't do any work on charges.- The magnetic field is always perpendicular to the velocity of the charge.- Magnetic fields deflect moving charges.
The following statements are true:
The magnetic force is always perpendicular to both the magnetic field and the velocity of the charge.Magnetic fields don't do any work on charges.Magnetic fields deflect moving charges.Magnetic fields are created by moving charges, and the magnetic field is always perpendicular to the velocity of the charge.
The magnetic force is always perpendicular to both the magnetic field and the velocity of the charge. The magnetic force is always perpendicular to both the magnetic field and the velocity of the charge. Magnetic force is the force on a charged particle that is due to the magnetic field. The magnetic force is always perpendicular to both the magnetic field and the velocity of the charge. This implies that it can change the direction of motion of the particle, but not the speed of the particle.
Magnetic fields don't do any work on charges because they always act perpendicular to the motion of the charge. Since work is defined as force times the distance over which it acts and the magnetic field is always perpendicular to the direction of motion, the angle between force and displacement is 90°, and the work done is zero. Magnetic fields deflect moving charges. Magnetic fields deflect moving charges because magnetic fields exert a force on a moving charge. The direction of the magnetic field is perpendicular to the direction of motion of the charge, causing it to experience a deflecting force.
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When using compass orientation, migrating animals make use of _____.a. memories from previous trips with parentsb. familiar landmarks and olfactory cuesc. the north and south polesd. the sun, stars, and Earth's magnetic field
When using compass orientation, migrating animals make use of the sun, stars, and Earth's magnetic field to navigate. So, option d is correct option.
Compass orientation in migrating animals is the process of using the sun, stars, and Earth's magnetic field to navigate. Migrating animals use a variety of techniques to navigate, depending on their species and environment.
Some animals use the position of the sun, stars, and Earth's magnetic field as their primary means of orientation when migrating. This is known as compass orientation.
Compass orientation is a technique that relies on environmental cues, such as the position of the sun and stars, to determine direction. Some animals can use the Earth's magnetic field to navigate as well. This is known as magnetic orientation.
Magnetic orientation is used by some species of birds and fish, as well as certain insects and reptiles. Other animals use landmarks and olfactory cues to navigate.
These animals rely on visual or chemical markers in the environment to orient themselves. This technique is known as piloting. Piloting is used by animals such as rodents, bats, and some species of birds. Animals that use piloting must be able to remember and recognize the landmarks they use as cues to navigate.
Finally, some animals use memories from previous trips with parents to navigate. This technique is known as true navigation. True navigation requires animals to have a highly developed sense of spatial awareness and memory. True navigation is used by animals such as sea turtles and some species of birds.
All of these techniques require different cognitive abilities and sensory mechanisms, but they allow animals to navigate over long distances to reach their desired destinations.
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What happens to the conductive properties of wood when it gets very hot?
A. It will change from being a good insulator to becoming a good conductor.
B. It will continue to remain a good conductor.
C. It will continue to remain a good insulator.
D. It will change from being a good conductor to becoming a good insulator.
Wood will still be an effective insulator. when the temperature of the wood reaches an extreme level.
Compared to materials like metals, marble, glass, and concrete, wood has a low thermal conductivity (high capacity to absorb heat). The axial direction of thermal conductivity is highest, and it rises with density and moisture content, making light, dry woods better insulators.
Insulators are substances that hinder the easy passage of electricity. Plastic, wood, and rubber are among the most insulating nonmetal materials.
Typically, wood has a perpendicular to the grain heat conductivity of between 0.1 and 0.2 W/mK.
It begins to pyrolyze when the temperature rises. Either the materials' internal structure retains the decomposition products, or they release them as gases. When gaseous substances interact with oxygen and each other, a lot of heat is produced. This additional heat promotes pyrolysis and combustion reactions.
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In the context of research evidence from the study conducted by Williams and McCririe, which of the following operates when a person picks up information critical to catching an object
both central and peripheral vision
In the context of research evidence from the study conducted by Williams and McCririe, both central and peripheral vision operate when a person picks up information critical to catching an object.
What is vision?
Vision is the sense that allows us to recognize and understand the physical world around us. Our brains then receive this information and convert it into the pictures that we see with our eyes.
Vision is the term used to describe the ability to see things with our eyes, such as color, form, and movement.
In the context of research evidence from the study conducted by Williams and McCririe, both central and peripheral vision operate when a person picks up information critical to catching an object.
Their research found that peripheral vision was essential to athletes performing in certain sports such as cricket, soccer, and baseball.
Peripheral vision, as well as central vision, are critical components of efficient eye tracking and hand-eye coordination.
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an object starts from rest at when the object moves in the x direction with positive velocity after the instantaneous velocity and average velocity are related by (a) (b) (c) (d) can be larger than, smaller than, or equal to
When an object starts from rest, and it moves in the x direction with a positive velocity, the instantaneous velocity and average velocity are related by the inequality d) "can be larger than, smaller than, or equal to."
The rate at which an object moves in a given direction is known as velocity. It is a vector quantity that has a magnitude and a direction. For example, if an object moves 10 meters to the north in 5 seconds, the velocity is 2 m/s northward.Average velocity and instantaneous velocityInstantaneous velocity is the velocity of an object at a particular instant or point in time. In other words, it's the speed of an object at a specific moment. The average velocity is the total displacement divided by the total time taken for the motion. In other words, it is the total distance covered in a given direction over a specific time period.
The instantaneous velocity and average velocity are related by the inequality that can be larger than, smaller than, or equal to. The instantaneous velocity represents the velocity at a particular moment or point in time, while the average velocity represents the average velocity over a specified time period. The instantaneous velocity and average velocity can be different because the instantaneous velocity is the velocity at a specific moment, whereas the average velocity is the average of all the velocities over a given period of time. Therefore, the instantaneous velocity and average velocity are related by the inequality d) "can be larger than, smaller than, or equal to."
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Why is this wrong? Can anybody please help me thanks!
Answer:
[tex]\boxed{5427N}[/tex]
Explanation:
We use the well-known equation:
[tex]F=m\cdot a[/tex]
where:
[tex]F=[/tex] Force (Newton)[tex]m=[/tex] mass [tex](kg)[/tex][tex]a=[/tex] acceleration (m/s^2)so, we can rewrite the equation like this:
[tex]F= (810kg)(6.7m/s^2)\\F=5427N[/tex]
So, taking into account the statement as seen in the image, your answer must be correct.
[tex]\text{-B$\mathfrak{randon}$VN}[/tex]
