The equivalent resistance of this circuit is 4.62 Ω.
What is resistors?
A resistor is an electronic component that is used to resist or limit the flow of electric current through a circuit. It is a passive component, which means it does not require any external power source to function.
Resistors are typically made of materials that have a high resistance to the flow of electric current, such as carbon, metal, or metal oxide
When resistors are connected in parallel, the total resistance can be calculated using the following formula:
1/Req = 1/R1 + 1/R2 + 1/R3 + ...
where Req is the equivalent resistance and R1, R2, R3, etc. are the individual resistances.
Applying this formula to the given circuit, we get:
1/Req = 1/10 + 1/15 + 1/20
1/Req = 0.1 + 0.0667 + 0.05
1/Req = 0.2167
Taking the reciprocal of both sides gives:
Req = 1/0.2167
Req = 4.62 Ω
Therefore, the equivalent resistance of this circuit is 4.62 Ω.
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An engineer is designing the runway for an airport. Of the plane that will use the airport, the lowest acceleration rate is likely to be 3 m/s2 . The takeoff speed for this plane will be 65 m/s. Assuming this minimum acceleration, what is the minimum allowed length for the runway?
Answer:
Approximately [tex]705\; {\rm m}[/tex].
Explanation:
Let [tex]x[/tex] denote the distance travelled before the plane takes off.
Let [tex]u[/tex] denote the initial velocity of the plane, and let [tex]v[/tex] denote the velocity of the plane when it takes off. It is given that the takeoff speed is [tex]v = 65\; {\rm m\cdot s^{-1}}[/tex]. Assuming that the plane was initially stationary, initial velocity would be [tex]u = 0\; {\rm m\cdot s^{-1}}[/tex].
It is given that the acceleration of the plane would be [tex]a = 3\; {\rm m\cdot s^{-2}}[/tex].
Since acceleration is constant, apply the SUVAT equation [tex]x = (v^{2} - u^{2}) / (2\, a)[/tex] to find the value of [tex]x[/tex]:
[tex]\begin{aligned} x &= \frac{v^{2} - u^{2}}{2\, a} \\ &= \frac{(65)^{2} - (0)^{2}}{2\, (3)}\; {\rm m} \\ &\approx 705\; {\rm m}\end{aligned}[/tex].
(Rounded up.)
Hence, the length of the runway should be at least [tex]705\; {\rm m}[/tex].
you are designing a spacecraft to a giant planet. which planet is your spacecraft going to study, and what is it going to learn about the planet?
A spacecraft is a vehicle that can travel into space. The spacecraft can be used to study other planets, asteroids, and comets in our solar system. Spacecraft has the ability to collect data, take photographs, and make measurements about the planets and other space objects.
What can you learn about a planet?With a spacecraft, scientists can learn a lot about planets. Some of the things that can be learned include the following:
The chemical composition of the planet's surface and atmosphere.The geology of the planet, such as mountains, valleys, and other features.How the planet rotates, and how long it takes to complete one rotation.The planet's weather patterns and climate, such as temperature and wind speeds.The planet's magnetic field, and how it interacts with the solar wind.The planet's moons and rings, and how they interact with the planet.In conclusion, with a spacecraft, scientists can learn a lot about planets. Information about a planet can vary depending on the planet.
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find the energy (in terms of kt) above the fermi level, for which the fermi-dirac probability is within 1% of the boltzmann approximation.
The energy above the Fermi level, in terms of kT, for which the Fermi-Dirac probability is within 1% of the Boltzmann approximation is kT/2.
This is because the Boltzmann approximation is valid for energies much larger than the Fermi energy, so in this case the energy is kT/2, where k is the Boltzmann constant and T is the temperature. The Fermi-Dirac probability is then within 1% of the Boltzmann approximation.
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Is it possible to have an acceleration without having a force?
No, there must always be a force present in order to have an acceleration. This is because, according to Newton's Second Law of Motion, acceleration is exactly proportional to force.
An item will accelerate more quickly the more force is given to it. An object's velocity will remain constant without a force acting on it (whether it is at rest or moving with a constant speed and direction), hence its acceleration will be zero. One of Newton's Three Laws of Motion, this is referred to as the Law of Inertia. No, an acceleration always requires the presence of a force. This is because acceleration is eminently proportional to force, in accordance with Newton's Second Law of Motion. it NOT possible to have an acceleration without having a force.
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what is the main factor to consider when planning your vessel’s approach to a dock where you intend to tie up?
Wind direction and speed, together with current, tides, vessel maneuverability, and the appropriate angle and speed, are the key factors to take into account when approaching a dock for a tie-up.
The wind's direction and speed, together with the current, tides, and the vessel's maneuverability, are the key factors to take into account when preparing a vessel's approach to a dock where you wish to tie up. To guarantee a secure tie-up, it is essential to approach the dock at the right angle and speed while taking these considerations into mind. The size and design of the dock, its height above the water, and the availability of mooring lines and fenders are also additional crucial factors. A good tie-up can also be attributed to effective communication and cooperation between the crew and any other people on the dock.
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One of the stable isotopes of lithium has 3 protons and 4 neutrons, so its atomic mass is 7. Assume that a lithium atom initially at rest radiates a photon of energy 1.8488 eV and recoils.
How long does it take for the recoiling atom to travel 1 mm? Assume that the lithium atom travels in a straight line without any collisions.
Note: 1 amu = 1.66 × 10-27 kg
t =
It takes 1.196 × 10-8 seconds for the recoiling lithium atom to travel 1mm.
We know that the energy of the photon is E = 1.8488 eV. The momentum of the photon is given by:
p = E/c
where c is the speed of light.
Substituting the values we get:
p = 1.8488 × 1.6 × 10-19/3 × 108p = 6.160 × 10-28 kg m/s
By the conservation of momentum, the momentum of the lithium atom will be equal in magnitude and opposite in direction to the photon. Therefore, we can write:
|p atom| = |p photon|
p atom = 6.160 × 10-28 kg m/s
Let m be the mass of the lithium atom. We can now use the kinetic energy equation:
KE = 1/2mv^2
where KE is the kinetic energy of the atom, and v is the velocity of the atom. Initially, the atom is at rest. After the photon is emitted, the atom recoils with velocity v. Therefore, we can write:
KE = E
kinetic energy of the atom = E = 1.8488 e
V = 1.8488 × 1.6 × 10-19 Joules
v = √2E/m
where m is the mass of the lithium atom.
Substituting the value of m, we get:
v = √2 × 1.8488 × 1.6 × 10-19/6.941 × 10-26v = 8.373 × 105 m/s
Time taken to travel 1 mm is given by
t = distance/velocity
where the distance is 1 mm = 1 × 10-3 m.
Substituting the values, we get:
t = 1 × 10-3/8.373 × 105
t = 1.196 × 10-8 seconds.
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What is the difference between point to point encryption and end-to-end encryption?
Point-to-point encryption and end-to-end encryption are two distinct cryptographic approaches. Both these methods offer data security but in different ways.
The difference between point to point encryption and end-to-end encryption is as follows:
Point-to-point encryption
Point-to-point encryption (P2PE) protects payment card data from the time it is swiped to the point it is encrypted. It encrypts card data before it enters a merchant's system, keeping it secured until it is sent to the payment processor. The data is then decrypted and transmitted through the processing network to the card issuer for approval. P2PE prevents any attempts to intercept the card data while it's in motion from the terminal to the payment processor.
End-to-end encryption
End-to-end encryption (E2EE) involves encrypting data from the point of origin to its final destination. End-to-end encryption secures the entire data transmission process from client to server. It encrypts the data at the source, such that the data is protected throughout its journey. Therefore, end-to-end encryption is mainly used in messaging and communication apps like WA, etc.
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Studying a spectrum from a star can tell us a lot. All of the following statements are true except one. Which statement is not true?The total amount of light in the spectrum tells us the star's radius.We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.Shifts in the wavelengths of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us.The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelength
All of the following statements are true about studying spectrum from a star except the statement that "The total amount of light in the spectrum tells us the star's radius."
It is possible to identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. In other words, we can determine which elements are present in a star by analyzing the spectrum of the light it emits. This is because every chemical element has a unique spectrum of energy that it emits.
The wavelength shifts of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us. This is known as the Doppler effect, and it enables astronomers to calculate how fast a star is moving relative to Earth. For example, if the spectral lines are shifted towards the blue end of the spectrum, it means that the star is moving towards us.
On the other hand, if the spectral lines are shifted towards the red end of the spectrum, it means that the star is moving away from us.The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelengths. This is because the hotter an object is, the more energy it radiates, and the shorter the wavelength of that radiation. Therefore, the peak of the thermal emission spectrum provides an indication of the star's temperature.
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what happens to the domains of an object when it becomes magnetized?
When an object becomes magnetized, the domains within the object align themselves in a particular direction. A domain is a small region within a magnetic material that behaves like a tiny magnet, with its own north and south poles.
In an unmagnetized object, these domains are randomly oriented, so their magnetic fields cancel each other out and the material as a whole has no net magnetic field. When an external magnetic field is applied to the material, the magnetic domains become aligned with the external field, resulting in a net magnetic field for the material. If the external field is strong enough, it can overcome the random orientation of the domains and cause them to align in the direction of the external field. Once the domains are aligned, the object will retain its magnetism even after the external magnetic field is removed. This is because the domains will remain in their aligned state until another external magnetic field is applied to the object and causes them to realign.
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The standard free energy for the reaction of oxygen binding to myoglobin Mb+O2(g)⇌ MbO2 is ΔG∘=−30.0kJmol−1 at 298 K and pH=7. The standard state of O2 is the dilute solution, molarity scale; therefore the concentration of O2 must be in M. What is the ratio MbO2/Mb in an aqueous solution at equilibrium with a partial pressure of oxygen pO2=400 Pa? Assume ideal behavior of O2 gas and for the protein in solution.
The ratio of MbO₂ to Mb at equilibrium with a partial pressure of oxygen pO₂ is 0.00002.
The ratio of MbO₂ to Mb in an aqueous solution at equilibrium with a partial pressure of oxygen pO₂ = 400 Pa can be calculated using the equation ΔG∘=−30.0 kJmol−1 at 298 K and pH = 7.
The equation used is: ΔG∘ = -RT ln (MbO₂/Mb), where R is the ideal gas constant and T is temperature in Kelvin. Rearranging this equation gives MbO₂/Mb = e^(-ΔG∘/RT).
Therefore, the ratio of MbO₂ to Mb at equilibrium with a partial pressure of oxygen pO₂ = 400 Pa is e^(-30.0/8.314*298) = 0.00002.
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shown below is a small particle of mass 25.0 g that is moving at a speed of 9.3 m/s when it collides and sticks to the edge of a uniform solid cylinder. the cylinder is free to rotate about its axis through its center and is perpendicular to the page. the cylinder has a mass of 0.460 kg and a radius of 9.3 cm, and is initially at rest. what is the angular velocity of the system after the collision?
A small particle of mass 25.0 g that is moving at a speed of 9.3 m/s when it collides and sticks to the edge of a uniform solid cylinder. The cylinder is free to rotate about its axis through its center and is perpendicular to the page. the cylinder has a mass of 0.460 kg and a radius of 9.3 cm, and is initially at rest. The angular velocity of the system after the collision is 55.7 rad/s.
The angular velocity of the system after the collision is determined by the conservation of angular momentum. This law states that the total angular momentum of an isolated system remains constant; if a system has an initial angular momentum of 0, any change in angular momentum must be balanced by a corresponding change in the rotational speed of the system.
In this case, the initial angular momentum of the system is 0 since the cylinder is initially at rest. After the collision, the mass of the small particle can be considered to be moving in a circular path with a radius of 9.3 cm. This means the final angular momentum of the system is equal to the linear momentum of the particle times the radius of the cylinder: 25.0 g x 9.3 cm x 9.3 m/s = 21.0 kg m2/s.
The final angular velocity of the system is then equal to the total angular momentum divided by the total moment of inertia of the system: 21.0 kg m2/s / (0.460 kg x (9.3 cm)2) = 55.7 rad/s.
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To go from a lower level in an atom to a higher level, an electron must give off a photon of energy lose its electric charge absorb a photon of energy wait until the atom has changed into another atom with more protons get a permission slip from Niels Bohr
An electron must absorb a photon of energy in order to go up an atom's levels. The electron gains energy as a result and jumps to a higher energy level.
An electron in an atom must absorb a photon of energy equal to the energy difference between the two levels in order to go from one level of energy to another. Excitation is the term for this action. The electron is elevated to a higher energy level after absorbing the photon. The electron will swiftly revert to its initial energy level, producing a photon with an energy equal to the difference between the two levels, as this is an unstable condition. A photon is released as a result of this procedure, which is also known as de-excitation or relaxation. Instruments that can detect this photon can be used to examine the energy levels of atoms.
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a neutral metal sphere is touched to a negatively charged metal rod. As a result the sphere will be_____ and the metal rod will be ________ . Fill in the gaps
a. positively charger. b.negatively charger. c. neutral. d. none
A neutral metal sphere is touched to a negatively charged metal rod. As a result the sphere will be a. positively charged and the metal rod will be b. negatively charged.
When a neutral metal sphere is touched to a negatively charged metal rod, the sphere will be positively charged, and the metal rod will be negatively charged. The process of charging through contact is known as contact electrification, triboelectrification, or electrostatic induction. It occurs when two different materials come into contact and exchange electrons, causing one of them to become positively charged and the other to become negatively charged.
As a result, a neutral metal sphere is touched to a negatively charged metal rod, the negatively charged rod donates some of its electrons to the sphere, giving it a net positive charge. The metal sphere will repel positively charged objects and attract negatively charged objects due to the positive charge it has acquired. The negatively charged rod will repel negatively charged objects and attract positively charged objects due to the negative charge it has acquired. Hence, the correct option is a. positively charged and b. negatively charged.
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two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. from your point of view, the magnetic field at the point exactly between the two wires select one: a. points down. b. points toward you. c. is zero. d. points away from you.
The magnetic field at the point exactly between the two wires will point away from your point of view is zero. The correct option is C.
What is the magnetic field?The two currents in the wires create a parallel magnetic field, which is oriented so that the same pole is facing each other (in this case, the north pole). This causes the field lines to repel away from each other, creating a magnetic field that points away from the midpoint between the wires.
The magnetic field at the point exactly between the two wires is zero. Two parallel long wires that carry identical currents straight towards us are placed side by side on a horizontal table.
As a result, the net magnetic field is zero.
Therefore, the correct option is C.
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an early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. when the craft was stationary, the tension in the cable was 5500 n . when the craft was lowered or raised at a steady rate, the motion through the water added an 1800 n drag force.
Part A
What was the tension in the cable when the craft was being lowered to the seafloor?
Express your answer to two significant figures and include the appropriate units.
Part B
What was the tension in the cable when the craft was being raised from the seafloor?
Express your answer to two significant figures and include the appropriate units.
Part A: When the craft is being lowered, the tension in the cable is 6387 N
Part B: When the craft is being raised, the tension in the cable is 5227 N
The weight of the craft will be equal to the force of gravity acting on it, which can be calculated using the mass of the craft and the acceleration due to gravity (g = 9.81 m/s²).
Therefore, the tension in the cable when the craft is being lowered is:
Tension = weight + drag force
Tension = (mass x g) + drag force
Tension = (unknown mass x 9.81 m/s²) + 1800 N
Tension = (unknown mass x 9.81) + 1800 N
Part A When the craft is stationary, the tension in the cable is 5500 N. This means that the weight of the craft is equal to the tension in the cable when it's not moving,
Solving for the mass:
5500 N = (mass x 9.81) + 0 N
mass = 5500 N / 9.81 m/s²
mass = 560.3 kg
Now we can substitute the mass into the expression for tension when the craft is being lowered:
Tension = (mass x 9.81) + 1800 N
Tension = (560.3 kg x 9.81 m/s²) + 1800 N
Tension = 6387 N
Therefore, the tension in the cable when the craft is being lowered to the seafloor is 6387 N.
Part B: When the craft is being raised at a steady rate, the tension in the cable will be equal to the weight of the craft minus the drag force due to the motion through the water.
Using the same mass of the craft that we calculated in Part A, we can calculate the tension in the cable when the craft is being raised:
Tension = weight - drag force
Tension = (mass x g) - drag force
Tension = (560.3 kg x 9.81 m/s²) - 1800 N
Tension = 5227 N
Therefore, the tension in the cable when the craft is being raised from the seafloor is 5227 N.
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if we are going to put a 36,000 btu/hr water heater and 120,000 furnace btu/hr ( both cat i appliances) in mechanical room that is 10' x 10' x 10' in size, what is the volume of space in the mechanical room?
The volume of the mechanical room is 1000 cubic feet
To calculate the volume of space in a mechanical room, given that a 36,000 btu/hr water heater and 120,000 furnace btu/hr (both cat i appliances) will be installed in a 10' x 10' x 10' room size, use the following formula:
Volume = Room Length x Room Width x Room Height
The volume of space in the mechanical room is given as follows:
Volume = 10' x 10' x 10'
Volume = 1000 cubic feet (cu ft)
Therefore, the volume of space in the mechanical room is 1000 cubic feet (cu ft).
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The temperature of a gas stream is to be measured by a thermocouple whose junction can beapproximated as a 1.2-mm-diameter sphere. The properties of the junction are k =35 W/m °C, p=8500kg/m3, and Cp = 320 J/kg °C, and the heat transfer coefficient between the junction and the gas is h=65W/m2 °C. Determine how long it will take for the thermocouple to read 99 percent of the initialtemperature difference. (∅/∅i= 0.01)
it will take 30.65 minutes for the thermocouple to read 99 percent of the initial temperature difference. (∅/∅i = 0.01).
The temperature of a gas stream is to be measured by a thermocouple whose junction can be approximated as a 1.2-mm-diameter sphere. So, the radius, r = 0.6 mm = 0.0006 m, the volume of the sphere, V = (4/3)πr³, and the area of the sphere, A = 4πr².
The properties of the junction are k = 35 W/m °C, p = 8500 kg/m³, and Cp = 320 J/kg °C, and the heat transfer coefficient between the junction and the gas is h = 65 W/m² °C.
We have, thermal conductivity of the sphere = k = 35 W/m °C, density of the sphere = p = 8500 kg/m³, specific heat of the sphere = Cp = 320 J/kg °C, and heat transfer coefficient between the sphere and the gas, h = 65 W/m² °C.
The initial temperature difference is given by, ΔT₀ = 1°C = 1 K. Let, the time taken for the thermocouple to read 99% of the initial temperature difference, ΔT99 = 0.99 K.
Let, the thermal diffusivity of the sphere be,
α = k / (pCp) = (35 W/m °C) / (8500 kg/m³ x 320 J/kg °C) = 0.000012868 m²/s.
And, the Biot number is given by, Bi = (h x A) / k = [(65 W/m² °C) x 4π(0.0006 m)²] / (35 W/m °C) = 0.0492.
The equation for the unsteady-state temperature profile of a sphere is, θ(r,t) = Σ [(-1)n+1 / n] exp(-n²π²αt / r²) sin (nπr / R), where R is the radius of the sphere. We can estimate the time taken for the thermocouple to read 99% of the initial temperature difference using a semi-log plot of θ/ΔT vs. t/ti.
This plot is linear and of the form, θ/ΔT = 1 - A exp (-Bt/ti), where A = 0.01 and B = (nπ/R)².So, θ/ΔT = 0.99 = 1 - A exp (-Bt/ti), or 0.01 exp (-Bt/ti) = 0.01/0.99, or exp (-Bt/ti) = 1/99, or -Bt/ti = ln (1/99), or t/ti = ln (99).
Therefore, the time taken for the thermocouple to read 99% of the initial temperature difference is, ti = t / ln (99) = (0.000012868 m²/s) (0.6 mm)² / (35 W/m °C) ln (99) = 1838.98 s or 30.65 minutes.
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Lab: Electromagnetic Induction: Instructions Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network folder. Upload each file separately. Your work will not be submitted to your teacher until you click Submit.
To complete the lab assignment on Electromagnetic Induction, first click the links to open the resources provided.
This will help you complete the task.
After creating the file(s) and once you are ready to submit your assignment,
click the 'Add Files' button and select each file from your desktop or network folder.
Remember to upload each file separately. Once you have uploaded the files, click 'Submit' to submit your work to your teacher.
In this lab, you are expected to understand and apply the concept of Electromagnetic Induction.
Electromagnetic Induction is a process where a varying magnetic field creates an electric field.
The electric field then induces a current in a nearby circuit. This current is caused by Faraday's law of induction.
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Complete the following statement: The sum of the magnitudes of the currents directed into a junction Select one: a. is divided equally among the number of lines directed out of the junction. b.equals the current that is directed along one of the lines out of the junction. c. is greater than the total current directed out of the junction. d. equals the sum of the magnitudes of the currents directed out of the junction.
By kirchoff rule ,The sum of the magnitudes of the currents directed into a junction equals the sum of the magnitudes of the currents directed out of the junction. Therefore, the correct option is d, which says that the sum of the magnitudes of the currents directed into a junction equals the sum of the magnitudes of the currents directed out of the junction.
How does a junction work?A junction is a point where two or more lines meet. The current flowing into the junction must be the same as the current flowing out of it. The current will divide into various branches at the junction. The sum of the current entering the junction equals the sum of the current exiting the junction. Therefore, the current through one branch must be subtracted from the current through the other branch when calculating the current through each branch.The law of conservation of charge says that charge is neither created nor destroyed. Thus, the sum of the charges that flow into a junction must equal the sum of the charges that flow out of it, according to Kirchhoff's junction rule.The Kirchhoff's junction rule states that the sum of the currents into a junction must equal the sum of the currents leaving the junction. When two or more resistors are connected in a circuit, they share the current flowing through the circuit in the same direction, and the current is split into two or more branches.
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suppose a clay model of a koala bear has a mass of 0.195 kg and slides on ice at a speed of 0.65 m/s. it runs into another clay model, which is initially motionless and has a mass of 0.36 kg. Both being soft clay, they naturally stick together. What is their final velocity?
The final velocity of the two clay models after they stick together is 0.23 m/s.
To calculate this, we use the conservation of momentum equation:
Final Momentum = Initial Momentum
m₁v₁+ m₂v₂ = (m₁ + m₁) x v
Where m₁ and v₁ are the mass and velocity of the first object, and m₂ and v₂ are the mass and velocity of the second object.
Given question:
m₁ = 0.195kg
v₁ = 0.65m/s
m₂ = 0.36kg
v₂ = 0
Applying the given values:
m₁v₁+ m₂v₂ = (m₁ + m₁) x v
0.195kg x 0.65m/s + 0.36kg x 0 = (0.195kg + 0.36kg) * v
0,126 = 0.555v
v = 0,23 m/s
Thus, their final velocity is 0.23 m/s.
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Resistors to be used in a circuit have average resistance 200 ohms and standard deviation 10 ohms. Suppose 25 of these resistors are randomly selected to be used in a circuit.
a) What is the probability that the average resistance for the 25 resistors is between 199 and 202 ohms?
b) Find the probability that the total resistance does not exceed 5100 ohms.
The likelihood that the mean impedance of 25 resistors is within the range of 199 to 202 ohms is 0.842, as per the principle of probability.
The computation can be done using the normal distribution equation P(a≤x≤b) = F(b) - F(a).
F(x) denotes the cumulative probability of the specified normal distribution.
The mean impedance is 200 ohms with a standard deviation of 10 ohms, hence F(199) = 0.155 and F(202) = 0.997. Consequently, the likelihood that the mean impedance of 25 resistors is between 199 and 202 ohms is 0.997 - 0.155 = 0.842.
The probability that the total impedance will be below 5100 ohms is 0.999. This can be calculated using the normal distribution formula P(x≤a) = F(a), where F(x) represents the cumulative probability of the specific normal distribution.
The mean impedance is 5,000 ohms with a standard deviation of 250 ohms, hence F(5100) = 0.999. Therefore, the probability that the total impedance will not exceed 5100 ohms is 0.999.
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joshua trees cannot germinate and grow as easily in today's warmer climate. which of these actions would be most likely to help the species survive climate change?
One of the actions that can be taken to help Joshua trees to survive climate change is protecting them from the direct impact of human activities.
Joshua trees are a part of the Agavaceae family and are also known by the name of Yucca brevifolia. It is a type of tree-like yucca that grows in arid regions such as the Mojave Desert. These trees are known for their unique, spiky green leaves and their rough trunk that has sharp leaves which grow upward. Joshua trees have a lifespan of about 500 to 1000 years and can grow up to 40 feet tall.
Joshua trees are being threatened due to climate change. Climate change is affecting their natural habitat and therefore, they cannot germinate and grow as easily as they used to do before. As a result, the number of Joshua trees is on the decline. To ensure the survival of these trees, we need to act immediately.
One of the most effective ways to help the Joshua trees survive climate change is to protect them from the direct impact of human activities. There are various ways to do this such as reducing carbon emissions, minimizing deforestation, promoting reforestation, and more. If we want these trees to survive, we need to act now to prevent further damage to their habitat. By protecting these trees from the negative effects of climate change, we can ensure their survival and preserve their beauty for generations to come.
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You know your mass is 70 kg, but when you stand on a bathroom scale in an elevator, it says your mass is 76 kg. What is the magnitude of the acceleration of the elevator? Express your answer using two significant figures.
The magnitude of the acceleration of the elevator is approximately 0.84 m/s².
When you stand on a bathroom scale in an elevator, it says your mass is 76 kg. Your actual mass is 70 kg.
Thus, the apparent weight of an object on the scale is the product of the object's mass and the net force acting on it. The scale reads a greater mass because of the upward force the elevator floor exerts on you.
The magnitude of the acceleration of the elevator is provided by the following formula:
The magnitude of the acceleration of the elevator = F_net/m,
where F_net is the net force on the object and m is the object's mass.
Since your actual mass is 70 kg and the scale measures an apparent mass of 76 kg, the net force acting on you is the difference between the apparent weight and the actual weight, which is given by
F_net = (76 kg - 70 kg) by × 9.8 m/s²
= 58.8 N
Thus, the magnitude of the acceleration of the elevator is: the magnitude of the acceleration of the elevator
= F_net/m = 58.8 N/70 kg
≈ 0.84 m/s²
Therefore, the magnitude of the acceleration of the elevator is approximately 0.84 m/s².
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which of the following includes all common types of radioactive decay? a. atomic number, beta particle emission, electron capture B. alpha particle emission, beta particle emission, half-life C. alpha particle emission, beta particle emission, radioactive parent isotope D. alpha particle emission, beta particle emission, electron capture E. alpha particle emission, stable daughter, electron capture
Alpha particle emission, beta particle emission, and electron capture are all common types of radioactive decay.The correct answer is D.
They are common types of radioactive decay's because:
Alpha particle emission involves the emission of an alpha particle (a helium nucleus) from the nucleus of an atom. This reduces the atomic number by 2 and the mass number by 4.Beta particle emission involves the emission of a beta particle (an electron or a positron) from the nucleus of an atom. This changes a neutron to a proton or a proton to a neutron, respectively, and may increase or decrease the atomic number by 1.Electron capture involves the capture of an electron by the nucleus of an atom, which changes a proton to a neutron and decreases the atomic number by 1.Option D includes all of these types of radioactive decay (alpha particle emission, beta particle emission, and electron capture), so it is the correct answer
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Can we use our brainly points.
What did the triangle say to the circle?
Your pointless
Answer:
i actually giggled at that oml.
Explanation:
that was good
The prelab required you to use the impedance method to calculate the steady-state amplitude and phase (in degrees) of vc to an input vs = cos(2phi ft) where f-1000 Hz (ω = 2phif). The results from the prelab are . Ao=_____Phase, φ =_____degrees
The steady-state amplitude Ao = 50.03 degrees and phase, φ = -88.7 degrees by using the impedance method.
The given equation for vs is:
vs = cos(2phi ft) ...[1]
where, f = 1000 Hz,
therefore ω = 2φf
ω= 2000π radians/s
Let's find the impedance of the circuit elements.
The impedance of the resistor is R.
The impedance of the capacitor is:
Zc = 1/(jωC)
The impedance of the inductor is:
ZL = jωL
As the capacitor and resistor are connected in series, their total impedance is:
ZC+R = R + 1/(jωC) ...[2]
Now, as the inductor is connected in parallel with the combination of R and C, the total impedance of the circuit is:
Ztotal = (ZC+R) || ZL...[3]
Ztotal = (R + 1/(jωC)) || jωL
Ztotal = 1/[(1/R) + j(1/ωC - ωL)]...[4]
Comparing the real and imaginary parts of the equation [4],
we get, 1/R = √{(1/ωC - ωL)^2} ...[5]and
1/ωC - ωL = 0
or
ωL = 1/ωC ...[6]
From equation [5],
we get, R = 1/√{(1/ωC - ωL)^2} ...[7]
The magnitude of the input voltage Vs is 1 volt.
The amplitude of the steady-state output voltage, Vc is given by:
Voc = Ao x 1VoltA0
Voc = R/ZtotalA0
Voc = R/1/[(1/R) + j(1/ωC - ωL)]A0
Voc = R(1/R) + jR(1/ωC - ωL)A0
Voc = 1 + jR(1/ωC - ωL) ...[8]
From equation [6],
we get: L = 1/(ωC)
L = 1/(2π x 1000)
L = 1.59 x 10-7 H
Substituting L in equation [6],
we get: ωL = ωC
ωL = 1/2π x 1000 x 1.59 x 10-7
ωL = 0.1Ω
From equation [7], we get: R = 1000 Ω
Substituting the value of R and ωL in equation [8],
we get: A0 = 1 + j1000(1/2π x 1000 x 1.59 x 10-7 - 0.1)
A0 = √{(1^2) + (-50.03)^2}
A0 = 50.03 degrees
Let φ be the phase of the output voltage with respect to the input voltage.
Therefore, we have: tanφ = -50.03φ = -88.7 degrees
Therefore, Ao = 50.03 degrees and φ = -88.7 degrees.
Answer: Ao = 50.03 degrees, φ = -88.7 degrees.
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a microwave oven operates at 2.90 ghz . what is the wavelength of the radiation produced by this appliance?
The given frequency of a microwave oven is 2.90 GHz. We have to find the wavelength of the radiation produced by this appliance. The speed of light is a constant value of 3 x 108 m/s. The relation between frequency and wavelength of electromagnetic radiation is given by:
c = fλ
Where,
c = speed of lightf = frequency of radiationλ = wavelength of radiationWe can rearrange this equation to get the formula for wavelength:
λ = c / f
Substituting the given values, we get:
λ = 3 x 108 / (2.90 x 109)λ = 0.1034 m or 10.34 cmTherefore, the wavelength of the radiation produced by the microwave oven is 10.34 cm.
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imagine swinging a ball in a circle at the end of a string. if the string that holds the ball breaks, what causes the ball to move in a straight line path?
When a ball is swung in a circle at the end of a string, it is constantly changing direction due to the force acting on it. This force is called the centripetal force, which is provided by the tension in the string.
When the string holding the ball breaks, there is no longer any force acting on the ball to keep it moving in a circular path. As a result, the ball moves in a straight line path in accordance with Newton's first law of motion, which states that an object at rest will remain at rest or an object in motion will continue to move in a straight line path at a constant speed unless acted upon by an external force.
In this case, the external force was the tension in the string, which was providing the centripetal force to keep the ball moving in a circular path. Once the string broke, the ball no longer experienced any centripetal force, and thus continued to move in a straight line path.
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the us bank tower in los angeles is designed to resist an earthquake of what magnitude on the richter scale?
The 8.3 on the Richter scale earthquake magnitude can be withstood by the US Bank Tower in Los Angeles.
How earthquake-proof is the Los Angeles U.S. Bank Tower?A frame that is strengthened in two directions is part of the central core structure. Two struts, each one level high, are employed to decrease horizontal stresses brought on by wind or earthquakes beginning at the 53rd floor.
A 9.0 earthquake can a tower withstand?Indeed, it is the answer. Modern structural design techniques can be used to construct skyscrapers that can resist earthquakes. Performance-based structural design (PBSD), a cutting-edge design methodology for creating earthquake-resistant structures, is one of them.
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which type of electromagnetic radiation has more energy than visible light and can pass through the human body?
X-rays have more energy than visible light and can pass through the human body.
X-rays are a type of electromagnetic radiation that has a shorter wavelength and higher frequency than visible light. Due to their high energy, X-rays can penetrate solid objects, including the human body. This property makes X-rays useful in medical imaging, such as X-ray radiography, computed tomography (CT) scans, and mammography.
When X-rays pass through the human body, they can be absorbed by the tissues or pass through, depending on the density of the material. Bones, for example, absorb more X-rays than soft tissues like muscle or fat, which is why they appear white in X-ray images.
While X-rays can be helpful in diagnosing medical conditions, they can also be harmful if exposure is not limited or controlled. Prolonged exposure to X-rays can damage DNA and potentially lead to cancer or other health problems.
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