5. As shown in the figure, each of two identical clocks (A and B) is a distance

Question

5. As shown in the figure, each of two identical                                                

clocks (A and B) is a distance r from its star. Each

star has the same mass, M.

Which statement below is true?       

A. Clock A runs faster than clock B

B. Clock B runs faster than clock A

C. Both clocks run at the same speed

D. Not enough information is given to determine which clock runs faster

6.You are floating inside a spaceship in a strange part of the Universe. You want to determine

whether the local spacetime is curved or flat. What tool(s) do you need to make this estimation?

A. A telescope

B. A very accurate clock

C. A very accurate ruler

D. A ruler and a very accurate protractor for measuring angles

E. A very accurate accelerometer to measure your acceleration

7. When you are far above the horizon of a black hole, you can not see any light coming from the

black hole. If you are below the horizon of the black hole, can you see any light coming in from

outside the horizon? And, if you see light from outside the black hole, does it appear the same as

it would if you were not in the vicinity of a black hole?

A. Yes, you see light coming in. It appears just the same as if you were not near a black hole

B. Yes, you see light coming in. It does not appear the same as if you were not near a black hole,

though

C. No, you do not see any light coming in from outside the horizon

As shown in the figure, each of two identical clocks (A and B) is a distance r from its star. Each star has the same mass, M. Which statement below is true? Clock A runs faster than clock B Clock B runs faster than clock A Both clocks run at the same speed Not enough information is given to determine which clock runs faster You are floating inside a spaceship in a strange part of the Universe. You want to determine whether the local spacetime is curved or flat. What tool(s) do you need to make this estimation? A telescope A very accurate clock A very accurate ruler A ruler and a very accurate protractor for measuring angles A very accurate accelerometer to measure your acceleration When you are far above the horizon of a black hole, you can not see any light coming from the black hole. If you are below the horizon of the black hole, can you see any light coming in from outside the horizon? And, if you see light from outside the black hole, does it appear the same as it would if you were not in the vicinity of a black hole? Yes, you see light coming in. It appears just the same as if you were not near a black hole Yes, you see light coming in. It does not appear the same as if you were not near a black hole, though No, you do not see any light coming in from outside the horizon

Explanation / Answer

5) C. Both clocks run at the same speed

6) E. A very accurate accelerometer to measure your acceleration

7)

B. Yes, you see light coming in. It does not appear the same as if you were not near a black hole,

though

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