Problem: 1. Your friend travels by you in a spaceship at 90% the speed of light. Which of the following is not true?A. You will see time running more slowly for your friend than for you.B. Your friend will see time running more slowly for you than for her.C. If you each perform the same experiment to measure the time for an atom to decay, you will each get the same result.D. Your friend will measure the length of your spaceship to be shorter than what you measure it to be.E. None of the above (all are true)2. When your friend flies by you in a spaceship at one half the speed of light, you observeA. Her spaceship to be longer than it is when it is not moving relative to you.B. Her spaceship to be shorter than it is when it is not moving relative to you.C. Her spaceship to be the same length, regardless of its speed relative to you.3. When your friend flies by you in a spaceship at half the speed of light, with lights that are simultaneously flashing in your frame, she observesA. The lights to flash simultaneously.B. The light in front of her to flash first.C. The light behind her to flash first.4. As an object's speed increases, its massA. Increases.B. Decreases.C. Stays the same.

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1. 

B. Your friend will see time running more slowly for you than for her.

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Problem Details

1. Your friend travels by you in a spaceship at 90% the speed of light. Which of the following is not true?

A. You will see time running more slowly for your friend than for you.
B. Your friend will see time running more slowly for you than for her.
C. If you each perform the same experiment to measure the time for an atom to decay, you will each get the same result.
D. Your friend will measure the length of your spaceship to be shorter than what you measure it to be.
E. None of the above (all are true)

2. When your friend flies by you in a spaceship at one half the speed of light, you observe

A. Her spaceship to be longer than it is when it is not moving relative to you.
B. Her spaceship to be shorter than it is when it is not moving relative to you.
C. Her spaceship to be the same length, regardless of its speed relative to you.

3. When your friend flies by you in a spaceship at half the speed of light, with lights that are simultaneously flashing in your frame, she observes

A. The lights to flash simultaneously.
B. The light in front of her to flash first.
C. The light behind her to flash first.

4. As an object's speed increases, its mass

A. Increases.
B. Decreases.
C. Stays the same.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Consequences of Relativity concept. You can view video lessons to learn Consequences of Relativity. Or if you need more Consequences of Relativity practice, you can also practice Consequences of Relativity practice problems.