1. A woman stands on top of a moving railroad car and tosses a ball straight up in the air. If there is no air resistance, where will the ball come back down?

1. behind the railroad car
2. ahead of the railroad car
3. into the woman's hand

2. If you were inside a windowless car that was traveling perfectly smoothly at a constant velocity, you could determine the speed of the car by dropping a ball.

1. True
2. False

3. Does time dilation mean that time actually passes more slowly in a moving reference frame or that it only seems to pass more slowly?

4. A young looking woman astronaut has just arrived home from a long trip at near the speed of light. She rushes up to an old gray-haired man and refers to him as her son. Is this possible?

5. If you were traveling away from the earth at a speed of 0.5 c, how would your heartbeat, length, and mass change? What would observers from earth say about their measurements of your heartbeat, length, and mass?

6. A person on another planet shines a flashlight at you. The planet and the earth are both in the same reference frame and are not moving relative to each other. At the same instant that the person shined the flashlight at you, a person on a spaceship passing that planet and moving toward you at 0.5 c also shined a flashlight at you. Which light pulse will reach you first?

a. the light from the person on the planet

b. the light from the flashlight on the spaceship

c. the two light pulses will reach you at the same time

7. If a spaceship will shrink when it travels at a speed of 0.75 c, do we need to make design changes to accommodate passengers and crew?

8. A beam of particles travel at a speed of 2.85 10⁸ m/s. At this speed, the particles average lifetime is measured to be 2.50 10^-8 s. What is a particle's lifetime when they are at rest?

9. A spaceship passes you at a speed of 0.80 c. You measure its length to be 90.0 m. How long would this space ship be at rest?

10. If you were to travel to a planet 36 light years from earth at a speed of 0.98 c, what would you measure the distance to be?

11 If the rest mass of a proton is 1.67 10^-27 kg, what is its mass when traveling at 0.85 c?

12. At what speed will the relativistic mass of an object be exactly double its rest mass?

13. How much energy would be produced if 1.00 milligram of mass were completely converted into energy?

14. What is relative motion?

15. The speed of light is a ___________ across the universe. What letter represents this?

16. To maintain a uniform speed of light, does the behavior of spaceor time change? Why?