Answer:ew
Explanation:
qeeqw
2. Do you expect the resistance of a light bulb to remain constant as the current through it is increased and the filament goes from red-hot to white-hot? Explain why or why not.
Answer:
Remember that as the temperature of an object increases, the kinetic energy of the particles inside it also increases.
So, if the temperature of a wire increases, the kinetic energy of the particles inside increases. Then when the electrons try to flow through the wire, the probability of a collision is increased (then the resistance increases). Thus, if the filament goes from red-hot to white-hot (so the temperature of the wire increases) we can conclude that the resistance that the current experiences also increases.
So no, we can not expect the resistance of the light bulb to remain constant as the filament goes from red-hot to white-hot.
how liquid state is change into solid state?
Answer:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. ... For example, solid water melts at 0°C and liquid water freezes at 0°C. During freezing, the temperature of a substance remains constant while the particles in the liquid form a crystalline solid.
Explanation:
When the liquid state freezes, it changes into solid state.
Example,
When you freeze water, it changes into ice, ice is a solid.
State what is meant by a gravitational potential at point A is -1·70 × 109 J kg-1.
Answer:
The energy stored in a body due to either it's position or change in shape is called gravitational potential energy.
a 2.00 kg object is moving east at 4.00 m/s when it collides with a 6 kg object that is initially at rest. after the collision the larger object moves east at 1 m/s. what is the final velocity of the smaller object after the collision
The final velocity of the smaller object is 1 m/s.
To calculate the final velocity of the smaller object, we use the formula below.
Formula:
mu+m'u' = mv+m'v'............. Equation 1Where:
m = mass of the bigger objectm' = mass of the smaller objectu = initial velocity of the bigger objectu' = initial velocity of the smaller objectv = final velocity of the bigger objectv' = final velocity of the smaller object.From the question,
m = 6 kgm' = 2 kgu = 0 m/s (at rest) u' = 4 m/sv = 1 m/sSubstitute these values into equation 1
6(0)+2(4) = 6(1)+2(v')8 = 6+2v'2v' = 8-62v' = 2v' = 1 m/sHence, The final velocity of the smaller object is 1 m/s.
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In order to create a larger induced electric field, one could... change the magnetic field more slowly. use a larger static magnetic field. change the magnetic field more quickly.
Answer:
change the magnetic field more quickly.
Explanation:
An electric field is defined as a region or an field which surrounds an [tex]\text{electrically-charged particle}[/tex] where it exerts force on all other particles that are charged present in the field or the region.
A magnetic field is defined as the physical field created by a magnet or by a moving charge which creates a force on another moving charge.
The strength of the induced electric field depends on the magnetic field. The change in the magnetic flux induces the electric field. As a result, for creating a larger induced electric field one have change the magnetic field quickly.
state five functions of a clinical thermometer
Answer:
- Temperature & Thermometer. By definition, the temperature is the measurable extent of hotness or coldness. It is a mathematical representation of heat.
- Types of Thermometer
- Clinical Thermometer. Clinical thermometers are meant for clinical purposes. It is developed for measuring the human body temperature.
- Laboratory Thermometer. Since clinical thermometers can’t be used to measure temperature other than the human body, we need a special type of thermometers for other purposes.
- Infrared Ear Thermometer. Checking the body temperature using the inside of the ear is known as tympanic membrane temperature.
In an elastic collision, a 400-kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 3.5 m/s and that of the trailing car is 6.4 m/s. Hint Assuming that the mass of the drivers is much, much less than that of the bumper cars, what are their final speeds
Answer:
v₁ = 3.5 m/s
v₂ = 6.4 m/s
Explanation:
We have the following data:
m₁ = mass of trailing car = 400 kg
m₂ = mass of leading car = 400 kg
u₁ = initial speed of trailing car = 6.4 m/s
u₂ = initial speed of leading car = 3.5 m/s
v₁ = final speed of trailing car = ?
v₂ = final speed of leading car = ?
The final speed of the leading car is given by the following formula:
[tex]v_2=\frac{2m_1}{m_1+m_2}u_1-\frac{m_1-m_2}{m_1+m_2}u_2\\\\v_2=\frac{(2)(400\ kg)}{400\ kg+400\ kg}(6.4\ m/s)-\frac{400\ kg-400\ kg}{400\ kg + 400\ kg}(3.5\ m/s)[/tex]
v₂ = 6.4 m/s
The final speed of the leading car is given by the following formula:
[tex]v_1=\frac{m_1-m_2}{m_1+m_2}u_1+\frac{2m_2}{m_1+m_2}u_2\\\\v_1=\frac{400\ kg-400\ kg}{400\ kg + 400\ kg}(6.4\ m/s)+\frac{(2)(400\ kg)}{400\ kg+400\ kg}(3.5\ m/s)[/tex]
v₁ = 3.5 m/s
The hour, minute, and second hands on a clock are 0.25 m , 0.31 m , and 0.34 m long, respectively.
What are the distances traveled by the tips of the hands in a 40 min interval?
Express your answers using two significant figures separated by commas.
In 1 hour, the hour hand sweeps across 1/12 of the clock's face. In 40 min, the hour hand travels (40 min)/(60 min) = 2/3 of the path it covers in an hour, so a total of 1/12 × 2/3 = 1/18 of the clock's face. This hand traces out a circle with radius 0.25 m, so in 40 min its tip traces out 1/18 of this circle's radius, or
1/18 × 2π (0.25 m) ≈ 0.087 m
The minute hand traverses (40 min)/(60 min) = 2/3 of the clock's face, so it traces out 2/3 of the circumference of a circle with radius 0.31 m:
2/3 × 2π (0.31 m) ≈ 1.3 m
The second hand completes 1 revolution each minute, so in 40 min it would fully trace the circumference of a circle with radius 0.34 m a total of 40 times, so it covers a distance of
40 × 2π (0.34 m) ≈ 85 m
The distances traveled by the tips of the hour hand, minute hand and second hand in a 40-min interval are 0.087 m, 1.3 m and 85 m respectively.
What are the hands of a clock?In a clock, there are three hands of the clock. One is hour hand, second is minute hand and third one is second hand.
The hour hand of the clock is 0.25 m long. The hour hand sweep 1/12 of the clock face each hour (as there are 12 hours in a clock). Thus, in a 40-minute interval, it will travel the distance of,
[tex]d=2\pi\times\dfrac{40}{12\times60}(0.25)\\d\approx0.087\rm\; m[/tex]
The minute hand of the clock is 0.25 m long. In a 40-minute interval, it will travel the distance of,
[tex]d=2\pi\times\dfrac{40}{60}(0.31)\\d\approx1.3\rm\; m[/tex]
The second hand of the clock is 0.25 m long. In a 40-minute interval, it will travel the distance of,
[tex]d=2\pi\times\dfrac{40\times60}{60}(0.34)\\d\approx85\rm\; m[/tex]
Thus, the distances traveled by the tips of the hour hand, minute hand and second hand in a 40 min interval are 0.087 m, 1.3 m and 85 m respectively
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.
Thermodynamic Processes: An ideal gas is compressed isothermally to one-third of its initial volume. The resulting pressure will be
Answer:
The resulting pressure is 3 times the initial pressure.
Explanation:
The equation of state for ideal gases is described below:
[tex]P\cdot V = n \cdot R_{u}\cdot T[/tex] (1)
Where:
[tex]P[/tex] - Pressure.
[tex]V[/tex] - Volume.
[tex]n[/tex] - Molar quantity, in moles.
[tex]R_{u}[/tex] - Ideal gas constant.
[tex]T[/tex] - Temperature.
Given that ideal gas is compressed isothermally, this is, temperature remains constant, pressure is increased and volume is decreased, then we can simplify (1) into the following relationship:
[tex]P_{1}\cdot V_{1} = P_{2}\cdot V_{2}[/tex] (2)
If we know that [tex]\frac{V_{2}}{V_{1}} = \frac{1}{3}[/tex], then the resulting pressure of the system is:
[tex]P_{2} = P_{1}\cdot \left(\frac{V_{1}}{V_{2}} \right)[/tex]
[tex]P_{2} = 3\cdot P_{1}[/tex]
The resulting pressure is 3 times the initial pressure.
When a player's finger presses a guitar string down onto a fret, the length of the vibrating portion of the string is shortened, thereby increasing the string's fundamental frequency. The string's tension and mass per unit length remain unchanged.
If the unfingered length of the string is l=65cm, determine the positions x of the first six frets, if each fret raises the pitch of the fundamental by one musical note in comparison to the neighboring fret. On the equally tempered chromatic scale, the ratio of frequencies of neighboring notes is 21/12
x1=
x2=
x3=
x4=
x5=
x6=
Answer:
Explanation:
For frequencies n generated in a string , the expression is as follows
n = 1 /2L√ ( T/m )
n is fundamental frequency , T is tension in string , m is mass per unit length and L is length of string.
If T and m are constant , then
n x L = constant , hence n is inversely proportional to L or length of string.
Frequencies increase by 21/12 = 1.75 , length must decrease by 1 / 1.75 times
Initial length of string is 65 cm .
x1 = 65 x 1 / 1.75 = 37.14 cm
x2 = 37.14 x 1/ 1.75 = 21.22 cm
x3 = 21.22 x 1 / 1.75 = 12.12 cm
x4= 12.12 x 1 / 1.75 = 6.92 cm
x5 = 6.92 x 1 / 1.75 = 3.95 cm
x6 = 3.95 x 1 / 1.75 = 2.25 cm
in an experiment the following readings were observed volume of alcohol flowing per minute equals to 10 raise to power - 5 cube volume density of alcohol is 800 kg per metre cube length of cube is 0.5 m radius of tube is 0.05 cm height of alcohol is 60 cm calculate the coefficient of viscosity of alcohol
Answer:
The viscosity is 1.30 x 10^-3 deca poise.
Explanation:
Volume per minute, V = 10^-5 m^3
Volume per second, V = 1.67 x 10^-7 m^3
density, d = 800 kg/m^3
radius, r = 0.05 cm
Length, L = 0.5 m
Height, h = 60 cm
Pressure, P = h d g = 0.6 x 800 x 9.8 = 4704 Pa
Use the formula of rate of flow
[tex]V = \frac{\pi p r^4}{8\eta L}\\\\1.67\times 10^{-7}\times8\times \eta\times 0.5 = 3.14\times 4707\times (0.05\times 10^{-2})^4\\\\\eta = 1.38\times 10^{-3} deca poise[/tex]
A simple machine has an IMA of 7. If the effort force of 5N is applied over a distance of 4m, what is the ideal resistance force, and how far does the load travel?a) Fr = 0.71 N and dr = 0.57 m.b) Fr = 0.71 N and dr = 28 m.c) Fr = 35 N and dr = 0.57 m. d) Fr = 35 N and dr = 28 m.
Answer:
Option C
Explanation:
From the question we are told that:
[tex]IMA=7[/tex]
Effort force [tex]F_e=5N[/tex]
Effort distance [tex]d_e=4m[/tex]
Generally the equation for IMA is mathematically given by
In Terms of Distance
[tex]IMA=\frac{d_e}{d_x}[/tex]
[tex]7=\frac{4}{d_x}[/tex]
[tex]d_x=0.57m[/tex]
In Terms of Force
[tex]IMA=\frac{F_x}{F_e}[/tex]
[tex]7=\frac{F_x}{5}[/tex]
[tex]F_x=35N[/tex]
Therefore
[tex]F_x=35N[/tex] and [tex]d_x=0.57m[/tex]
Option C
bicycle generator rotates at 1800 rad/s, producing an 18.0 V peak emf. It has a 1.00 cm by 3.00 cm rectangular coil in a 0.794 T field. (a) How many turns are in the coil?
Answer:
N = 42
Explanation:
Given that,
Angular velocity, [tex]\omega=1800\ rad/s[/tex]
Peak emf, [tex]\epsilon=18\ V[/tex]
The dimensions of the rectangular coil = 1.00 cm by 3.00 cm
Magnetic field, B = 0.794 T
We know that, the emf of the coil is given by :
[tex]\epsilon=NAB\omega[/tex]
Where
N is number of turns in the coil
So,
[tex]N=\dfrac{\epsilon}{AB\omega}\\\\N=\dfrac{18}{0.01\times 0.03\times 0.794\times 1800}\\\\N=41.98[/tex]
or
N = 42
So, there are 42 turns in the coil.
A bullet is fired vertically upward a velocity of 80m/s to what height will the bullet rise above the point of projection
Answer:
The bullet will rise 320 meters above the point of projection.
Explanation:
Assuming that air friction is negligent we can use the kinematic equation:
[tex]v_{2} ^2=v_{1} ^2+2(-a)d\\0\frac{m^2}{s^2} =6400\frac{m^2}{s^2} +2(-10\frac{m}{s^2} )d\\-6400\frac{m^2}{s^2} =(-20\frac{m}{s^2}) d\\320m=d[/tex]
*acceleration is negative (-a) as it is acting in the opposite direction of the motion of the bullet.*
The bullet rises to a height of 3600 m if a bullet is fired upward with a velocity of 80 m/s.
Assume the air friction is negligible, the kinematic equation:
[tex]v_f^2 = v_i^2 +2(-a) d[/tex]
Where,
[tex]v_i^2[/tex] - iinitial velocity = 80 m/s
[tex]v_f^2[/tex]- final velocity = 0
[tex]d[/tex]- distance= ?
[tex]a[/tex]- gravitational acceleration = 9.8 m/s² = 10 m/s²
Put the values in the formula,
[tex]\begin {aligne} 0 = (80)^2 + 2 (10)^2 d\\\\d = \dfrac {6400}{ 200}\\\\d &= 3600 \rm \ m\end {aligne}\\[/tex]
Therefore, the bullet rises to a height of 3600 m if a bullet is fired upward with a velocity of 80 m/s.
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A uniform circular disk has a radius of 34 cm and a mass of 350 g. Its center is at the origin. Then a circular hole of radius 6.8 cm is cut out of it. The center of the hole is a distance 10.2 cm from the center of the disk. Find the moment of inertia of the modified disk about the origin.
Answer:
u can ask it to the person who give ot to u i dont no
a very long solenoid is constructed as a coil of wire. Current is allowed the flow through the solenoid which creates a magnetic field. How the does the magnetic field change if the radius of the solenoid is doubled but everything else doesnt change
Answer:
the magnetic field of the solenoid will remain same.
Explanation:
The magnetic field of a solenoid is given by the following formula:
[tex]B = \frac{\mu_o NI}{l}[/tex]
where,
B = magnetic field
μ₀ = permeability of free space
N = total number of coils
I = current passing through the solenoid
L = length of the solenoid
The formula clearly shows that the radius of the solenoid has no effect on the magnetic field produced by it.
Therefore, the magnetic field of the solenoid will remain same.
omparing Technological Design and Scientific Investigation
Explain how the stages of technological design are similar to the process of scientific investigation. Use specific stages from each process to support your answer
Answer:
杰恩斯克克斯克奇沃伊斯克克斯克什德布德克什恩克恩德恩克恩茨克杰兹姆克斯恩斯姆斯姆德恩德姆德武伊乔奥斯克斯杰德布德赫德夫赫富伊什杰吉迪赫德赫夫赫德
Answer:
Scientists learn more about the natural world through investigation by identifying a problem, researching related information, designing and conducting an investigation, analyzing the results, evaluating the conclusion, and communicating the findings. Engineers follow similar steps when creating new products or solutions through technological design. The four stages of technological design include identifying a need, designing and implementing a solution, and evaluating the solution.
If four students separately measure the density of a rock, and they all have very low percent
differences between their measurements, what can you say for certain about the accuracy of their
results?
Answer:
Their measured results are closer to the exact or true value. Hence, their measured value is considered to be more accurate.
Explanation:
Considering the situation described above, the accuracy of a measured value depicts how closely a measured value is to the accurate value.
Hence, since the students' measured values have very low percent differences, it shows the similarity of computations or estimates to the actual values, which in turn offers a smaller measurement error.
Therefore, their measured results are closer to the exact or true value, which implies that their measured value is considered to be more accurate.
If a charge travels through a magnetic field, it experiences a magnetic force and its velocity is perpendicular to the direction of the magnetic field. Answer the following questions about the situations given below.
What is the direction of the force on a positive charge when passing through a magnetic field as indicated in the diagram? Explain how you got your answer.
+q ->(right arrow) v (downwards arrow)B
What is the direction of the magnetic field above and below the current-carrying wire below, where the current is flowing in the +x- direction? Explain how you got your answer
[image of a long arrow pointing to the right]
Why aren't the right-hand rules used to figure out the force exerted on particles traveling parallel to a magnetic field?
Answer:
cant see
Explanation:
Help please. I don’t understand
(D)
Explanation:
That's the statement of the Pythagorean theorem.
[tex]c^2=a^2+b^2 \Rightarrow c = \sqrt{a^2+b^2}[/tex]
When 93 is written in simplest radical form, which value remains under the radical?
Explanation:
plz brainliest me
Answer:
I think it's 9 but edge says it's not
Explanation:
it should be 3√9^2
What magnitude point charges creates a 10000 N/C electric field at a distance of 0.5 m?
a. 877.2 nC
b. 287.7 nC
c. 277.8 nC
d. 872.7 nC
Answer:
c. 277.8 nC
Explanation:
applying,
E = kq/r²............. Equation 1
Where E = electric field intensity, q = charge, r = distance, k = coulomb's constant.
make q the subject of the equation
q = Er²/k............... Equation 2
From the question,
Given: E = 10000 N/C, r = 0.5 m
Constant: k = 9×10⁹ Nm²/C²
Substitute these values into equation 2
q = (10000×0.5²)/(9×10⁹)
q = 277.8×10⁹
q = 277.8 nC
Hence the right option is c. 277.8 nC
What happens in this story that tells us this story is a fairy tale? (Prove this is a fairy tale by quoting something from the story that shows this is a fairy tale and not a true story)
Answer:
Use of words such as once upon a time, god mother, forest tower etc.
Explanation:
A fairy tale is a story based on society, class and relationships. Its a short and has mythical creatures like dragons and many more. It is less technical and generally has a happy or fairy tale ending.hi can anyone pls answer this question. i will mark brainliest
Answer:
a.work done by man A is zero
D is best option
Explanation:
D none of them because as we know that to do work some distance should be cover with some load as both picture they are covering some distance with carrying some load so A and B option are absolutely wrong and remaining C they are not doing same amount of work because distance cover by them and load carrying by them is different so how can work be same so D is best option none of A B C is correct answer
Question 8 of 20
What identifies your skills and interests to help you plan out your career
goals?
A. A self-examination
B. A self-assessment
O C. A self-help book
O D. A bit of self-knowledge
Answer:
c
Explanation: because i took it and got it correct
Why does the north poll of Jupiter form hexagonal shapes in the clouds of Jupiter. Trying to see if people got brains
Explanation:
They believe that vortexes occur at the planet's north pole because of atmospheric flows deep within the gas giant, and that these vortexes pinch an intense horizontal jet near the equator—which is what warps the storm into a hexagon
Because of the internal resistance of a real battery, we know that the potential difference between the terminals:___________
a. decreases as more current is drawn.
b. increases as more current is drawn.
c. is greater than the emf of the battery
d. increases as the internal resistance increases.
Answer: I think the ans is A but I’m not sure.
Can someone check it and tell me I would like to know
The average 8-18 year old spends how many hours per day average in front of a screen doing little physical activity
Nearly four hours every day, doing little to no physical activity.
Explain briefly how solar energy is used to generate electricity
This when the energy from the sun is trapped by either sun panel or others. It passes through conventions then we get the energy out as electricity.
Answer:
Solar radiation may be converted directly into electricity by solar cells (photovoltaic cells). In such cells, a small electric voltage is generated when light strikes the junction between a metal and a semiconductor (such as silicon) or the junction between two different semiconductors.
Explanation:
Pls mark me as brainliest
Solar radiation may be converted directly into electricity by solar cells or photovoltaic cells. This is how solar energy is used to generate electricity.
What is solar energy?Solar energy is the radiant light and heat from the Sun that is captured and used in a variety of technologies, including solar power to generate electricity, solar thermal energy, and solar architecture.
When the sun shines on a solar panel, the photovoltaic cells in the panel absorb the energy from the sun. When light strikes the junction of a metal and a semiconductor (such as silicon) or the junction of two different semiconductors, a small electric voltage is generated. This energy generates electrical charges that move in response to an internal electrical field in the cell, resulting in the flow of electricity.
Therefore, solar energy is used to generate electricity.
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Some copper wire has a resistance of 200 ohms at 20 degrees C . A current is then passed through the same wire and the temperature rises to 90 degrees C. Determine the resistance of the wire at 90 degrees correct to the nearest ohm assuming the coefficient of resistance is 0.004/degree C at 0 degrees
Answer:
256 ohms
Explanation:
Applying,
R = R'[1+α(T-T')]............. Equation 1
Where R = Final resistance of the wire, R' = Initial resistance of the wire, T = Final temperature, T' = Initial temperature, α = Temperature coefficient of resistance
From the question,
Given: R' = 200 ohms, T = 90 degrees, T' = 20 degrees, α = 0.004/degree
Substitute these values into equation 1
R = 200[1+0.004(90-20)]
R = 200[1+0.28]
R = 200(1.28)
R = 256 ohms
The resistance of the wire at 90 °C correct to the nearest ohm assuming the coefficient of resistance is 0.004 °C¯¹ is 256 ohm
Data obtained from the question Original resistance (R₁) = 200 ohmOriginal temperature (T₁) = 20 °C Coefficient of resistivity (α) = 0.004 °C¯¹New temperature (T₂) = 90 °C New resistance (R₂) =? How to determine the new resistanceα = R₂ – R₁ / R₁(T₂ – T₁)
0.004 = R₂ – 200 / 200(90 – 20)
0.004 = R₂ – 200 / 200(70)
0.004 = R₂ – 200 / 14000
Cross multiply
R₂ – 200 = 0.004 × 14000
R₂ – 200 = 56
Collect like terms
R₂ = 56 + 200
R₂ = 256 ohm
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