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Chapter 2: Special Relativity

Modern Physics
Pages: 5 - 72
Modern Physics

Modern Physics

Book edition 2nd Edition
Author(s) Randy Harris
Pages 633 pages
ISBN 9780805303087

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114 Questions for Chapter 2: Special Relativity

  1. Can two moving objects of mass 2 and 3 stick together and form a single object of mass less than 5? Explain your-reasoning.

    Found on Page 5
  2. Particles of light have no mass. Does the Sun’s mass change as a result of all the light it emits? Explain.

    Found on Page 5
  3. You are strapped into a rear-facing seat at the middle of a long bus accelerating: from rest at about (a rather violent acceleration for a bus). As the back of the bus passes a warning sign alongside the street, a red light of precisely wavelength on the sign turns on. Do you see this precise wavelength? Does your friend silting at the front of the bus see the wavelength you see? How could the same observations be produced with the bus and sign stationary?

    Found on Page 5
  4. In a television picture tube, a beam of electrons is sent from the back to the front (screen) by an electron gun. When an electron strikes the screen, il causes a phosphor to glow briefly. To produce an image across the entire screen. the beam is electrically deflected up and down and left and right. The beam may sweep from left to right at a speed greater than c. Why is this not a violation of the claim that no information may travel faster than the speed of light?

    Found on Page 62
  5. Explain to your friend, who is willing to accept that light moves at the same speed in any frame, why clocks on a passing train are not synchronized. If it helps, assume that Anna is at the middle of the train.

    Found on Page 61
  6. According to Bob on Earth, Planet Y (uninhabited) is 5 ly away. Anna is in a spaceship moving away from Earth at 0.8c. She is bound for planet Y to study its geology. Unfortunately, Planet Y explodes. According to Bob.This occurred 2 yr after Anna passed Earth. (Bob. of course. has, to wait a while for the light from the explosion to arrive, but he reaches his conclusion by “working backward”) Call the passing of Anna and Bob time zero for both. (a) According to Anna, how far away is Planet Y when it explodes? (b) At what time does it explode?

    Found on Page 62
  7. Anna is on a railroad flatcar moving at 0.6c relative to Bob. (Their clock's read 0 as Anna’s center of mass passes Bob's.) Anna’s arm is outstretched in the direction the flatcar moves, and in her hand in a flashbulb. According to the wristwatch on Anna's hand, the flashbulb goes off at 100 ns. The time of this event according to Bob differs by 27 ns. (a) Is it earlier or later than 100 ns? (b) How long is Anna's arm (i.e., from her hand to her center of mass.)?

    Found on Page 63
  8. Anna and Bob are In identical spaceships, each 100 m long. The diagram shows Bob's, view as Anna's ship passes at 0.8c. Just as the backs of the ships pass one another, both clocks.there read O. At the instant shown, Bob Jr., on board Bob's ship, is aligned with the very front of Anna's ship. He peers through a window in Anna's ship and looks at the clock. (a) In relation to his own ship, where is Bob Jr? (b) What does the clock he sees read?

    Found on Page 63
  9. The diagram shows Bob's view of the passing of two identical spaceship. Anna's and his own, where γv=2. The length of either spaceship in its rest frame is . What are the readings on Anna', two unlabelled clocks?

    Found on Page 63
  10. A spaceship travels at 0.8c. As this spaceship covers 4000km from coast to coast, by how much will the time interval registered on an onboard clock differ from the time interval measured on ground?

    Found on Page 5

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