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University Physics Volume 3
17th Edition
ISBN: 9781938168185
Author: William Moebs, Jeff Sanny
Publisher: OpenStax
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Textbook Question
Chapter 5, Problem 5.2CYU
Check Your Understanding What is
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Students have asked these similar questions
4.) The diagram shows the electric field lines of a positively charged conducting sphere of
radius R and charge Q.
A
B
Points A and B are located on the same field line.
A proton is placed at A and released from rest. The magnitude of the work done by the electric field in
moving the proton from A to B is 1.7×10-16 J. Point A is at a distance of 5.0×10-2m from the centre of
the sphere. Point B is at a distance of 1.0×10-1 m from the centre of the sphere.
(a) Explain why the electric potential decreases from A to B. [2]
(b) Draw, on the axes, the variation of electric potential V with distance r from the centre of the
sphere.
R
[2]
(c(i)) Calculate the electric potential difference between points A and B. [1]
(c(ii)) Determine the charge Q of the sphere. [2]
(d) The concept of potential is also used in the context of gravitational fields. Suggest why scientists
developed a common terminology to describe different types of fields. [1]
3.) The graph shows how current I varies with potential difference V across a component X.
904
80-
70-
60-
50-
I/MA
40-
30-
20-
10-
0+
0
0.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VIV
Component X and a cell of negligible internal resistance are placed in a circuit.
A variable resistor R is connected in series with component X. The ammeter reads 20mA.
4.0V
4.0V
Component X and the cell are now placed in a potential divider circuit.
(a) Outline why component X is considered non-ohmic. [1]
(b(i)) Determine the resistance of the variable resistor. [3]
(b(ii)) Calculate the power dissipated in the circuit. [1]
(c(i)) State the range of current that the ammeter can measure as the slider S of the potential divider
is moved from Q to P. [1]
(c(ii)) Describe, by reference to your answer for (c)(i), the advantage of the potential divider
arrangement over the arrangement in (b).
1.) Two long parallel current-carrying wires P and Q are separated by 0.10 m. The current in wire P is 5.0 A.
The magnetic force on a length of 0.50 m of wire P due to the current in wire Q is 2.0 × 10-s N.
(a) State and explain the magnitude of the force on a length of 0.50 m of wire Q due to the current in P. [2]
(b) Calculate the current in wire Q. [2]
(c) Another current-carrying wire R is placed parallel to wires P and Q and halfway between them as shown.
wire P
wire R
wire Q
0.05 m
0.05 m
The net magnetic force on wire Q is now zero.
(c.i) State the direction of the current in R, relative to the current in P.[1]
(c.ii) Deduce the current in R. [2]
Chapter 5 Solutions
University Physics Volume 3
Ch. 5 - Check Your Understanding Explain how special...Ch. 5 - Check Your Understanding What is if v=0.650c?Ch. 5 - Check Your Understanding a. A particle travels at...Ch. 5 - Check Your Understanding A particle is traveling...Ch. 5 - Check Your Understanding Shaw that if a time...Ch. 5 - Check Your Understanding Distances along a...Ch. 5 - Check Your Understanding Suppose a space probe...Ch. 5 - Check Your Understanding What is the momentum of...Ch. 5 - Check Your Understanding What is the kinetic...Ch. 5 - Which of Einstein’s postulates of special...
Ch. 5 - Is Earth an inertial frame of reference? Is the...Ch. 5 - When you are flying in a commercial jet, it may...Ch. 5 - (a) Does motion affect the rate of a clock as...Ch. 5 - To whom does the elapsed time for a process seem...Ch. 5 - (a) How could you travel far into the future of...Ch. 5 - To whom does an object seem greater in length, an...Ch. 5 - Relativistic effects such as time dilation and...Ch. 5 - Suppose an astronaut is moving relative to Earth...Ch. 5 - Explain the meaning of the terms "red shift" and '...Ch. 5 - What happens to the relativistic Doppler effect...Ch. 5 - Is the relativistic Doppler effect consistent with...Ch. 5 - All galaxies farther away than about exhibit a red...Ch. 5 - How does modern relativity modify the law of...Ch. 5 - Is it possible for an external force to be acting...Ch. 5 - How are the classical laws of conservation of...Ch. 5 - What happens to the mass of water in a pot when it...Ch. 5 - Consider a thought experiment. You place an...Ch. 5 - The mass of the fuel in a nuclear reactor...Ch. 5 - We know that the velocity of an object with mass...Ch. 5 - Given the fact that light travels at c, can it...Ch. 5 - If you use an Earth based telescope to project a...Ch. 5 - What is if (b) IfCh. 5 - What is if IfCh. 5 - Particles called mesons are produced by...Ch. 5 - Suppose a particle called a kaon is created by...Ch. 5 - A neutral meson is a particle that can be created...Ch. 5 - A neutron lives 900 s when at rest relative to a...Ch. 5 - If relativistic effects are to be less than then...Ch. 5 - If relativistic effects are to be less than then...Ch. 5 - A spaceship, 200 m long as. seen on board, moves...Ch. 5 - How fast would a 6.0 m-long sports car have to be...Ch. 5 - (a) How far does the muon in Example 5.3 travel...Ch. 5 - (a) How long would the mum] in Example 5.3 have...Ch. 5 - Unreasonable Results A spaceship is heading...Ch. 5 - Describe the following physical occurrences as...Ch. 5 - Describe what happens to the angle and therefore...Ch. 5 - Describe the shape of the world line on a...Ch. 5 - A man standing still at a train station watches...Ch. 5 - When observed from the sun at a particular...Ch. 5 - A man is running on a straight road perpendicular...Ch. 5 - A man is running on a straight road that makes...Ch. 5 - In a frame at rest with respect to the billiard...Ch. 5 - In a frame at rest with respect to the billiard...Ch. 5 - In a frame S, two events are observed: event 1: a...Ch. 5 - If two spaceships are heading directly toward each...Ch. 5 - Two planets are on a collision course, heading...Ch. 5 - When a missile is shot from one spaceship toward...Ch. 5 - What is the relative velocity of two spaceships if...Ch. 5 - Prove that for any relative velocity v between two...Ch. 5 - Show that for any relative velocity v between two...Ch. 5 - A highway patrol officer uses a device that...Ch. 5 - Find the momentum of a helium nucleus having a...Ch. 5 - What is the momentum of an electron travelling at...Ch. 5 - (a) Find the momentum of a asteroid heading...Ch. 5 - (a) What is the momentum of a 2000-kg satellite...Ch. 5 - What is the velocity of an electron that has a...Ch. 5 - Find the velocity of a proton that has a momentum...Ch. 5 - What is the rest energy of an electron, given its...Ch. 5 - Find the rest energy in joules and MeV of a...Ch. 5 - If the rest energies of a proton and a neutron...Ch. 5 - The Big Bang that began the universe is estimated...Ch. 5 - A supernova explosion of a star produces of...Ch. 5 - (a) Using data from Potential Energy Of a...Ch. 5 - Using data from Potential Energy of a System...Ch. 5 - There is approximately of energy available from...Ch. 5 - A muon has a rest mass energy of 105.7 MeV, and it...Ch. 5 - A meson is a particle that decays into a muon and...Ch. 5 - (a) Calculate the relativistic kinetic energy of a...Ch. 5 - Alpha decay is nuclear decay in which a helium...Ch. 5 - (a) Beta decay is nuclear decay in which an...Ch. 5 - (a) At what relative velocity is (b) At what...Ch. 5 - (a) At what relative velocity is (b) At what...Ch. 5 - Unreasonable Results (a) Find the value of...Ch. 5 - (a) How long does it take the astronaut in Example...Ch. 5 - (a) How fast would an athlete need to be running...Ch. 5 - (a) Find the value of for the following situation....Ch. 5 - A clock in a spaceship tuns one-tenth the rate at...Ch. 5 - An astronaut has a heartbeat rate of 66 beats per...Ch. 5 - A spaceship (A) is moving at speed c/2 with to...Ch. 5 - Same two observers as in the preceding exercise,...Ch. 5 - Same two observers as in the preceding exercises....Ch. 5 - An observer at origin of inertial frame S sees a...Ch. 5 - An observer sees two events 1.5108s apart at a...Ch. 5 - An observer standing by the railroad tracks sees...Ch. 5 - Two astronomical events are observed from Earth to...Ch. 5 - Two astronomical events are observed to occur at a...Ch. 5 - A spacecraft starts from being at rest at the...Ch. 5 - (a) All but the closest galaxies are receding from...Ch. 5 - Suppose a spaceship heading straight toward the at...Ch. 5 - Repeat the preceding problem with the ship heading...Ch. 5 - If a spaceship is approaching the Earth at 0.100c...Ch. 5 - (a) Suppose the speed of light were only 3000 m/s....Ch. 5 - If a galaxy moving away from the Earth has a speed...Ch. 5 - A space probe speeding towards the nearest star...Ch. 5 - Near the center of our galaxy, hydrogen gas is...Ch. 5 - (a) Calculate the speed of a particle of dust that...Ch. 5 - (a) Calculate for a proton that has a momentum of...Ch. 5 - Show that the relativistic form of Newton’s second...Ch. 5 - A positron is an antimatter version of the...Ch. 5 - What is the kinetic energy in MeV of a meson that...Ch. 5 - Find the kinetic energy in MeV of a neutron with a...Ch. 5 - (a) Show that that at large velocities This means...Ch. 5 - One cosmic ray neuron has a velocity of 0.250c...Ch. 5 - What is for a proton having amass energy of 938.3...Ch. 5 - (a) What is the effective accelerating potential...Ch. 5 - (a) Using data from Potential Energy of a...Ch. 5 - (a) Calculate the energy released by the...Ch. 5 - A Van de Graaff accelerator utilizes a 50.0 MV...Ch. 5 - Suppose you use an average of 500 k W·h of...Ch. 5 - (a) A nuclear power plant converts energy from...Ch. 5 - Nuclear-powered rockets were researched for some...Ch. 5 - The sun energy at a rate of 3.85×10 26 W by the...Ch. 5 - Show that for a particle is invariant under...
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