Universe: Stars And Galaxies
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ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
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Chapter 21, Problem 20Q
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Whether a ball dropped in a car which is moving at a constant
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According to Einstein’s two postulates of special relativity:
The first postulate states that: All inertial reference frames are equivalent. Explain what is meant by this first postulate.
The great proof of Einstein's Theory of General Relativity was that light is bent by gravity (as it travels through a curved
spacetime). Which of these statements is true??
O A light ray is bent the same amount, it doesn't matter how strong the gravity is.
O A light ray is bent less by an intense gravitational field.
O A light ray is bent more by an intense gravitational field.
O Light rays aren't bent.
How would our lives be affected if Einstein's postulates were true but the speed of light were 100 km/h? (Hint: Consider simple specific examples, such as the nature of a highway journey at 60 km/h. What difficulty arises as we try to ac celerate the car to 110 km/h?)
Chapter 21 Solutions
Universe: Stars And Galaxies
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- It is said that Einstein, in his teenage years, asked the question, What would I see in a mirror if I carried it in my hands and ran at the speed of light? How would you answer this question?arrow_forwardCheck Your Understanding Explain how special relativity differs from general relativity.arrow_forwardIs Earth an inertial frame of reference? Is the sun? Justify your response.arrow_forward
- How does modern relativity modify the law of conservation of momentum?arrow_forwardIf a spaceship is approaching the Earth at 0.100c and a message capsule is sent toward it at 0.100c relative to Earth, what is the speed of the capsule relative to the ship?arrow_forwardIf two spaceships are heading directly toward each other at 0.800c, at what speed must a canister be shot from the first ship to approach the other at 0.999c as seen by the second ship?arrow_forward
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