Chapter 26 Homework
1. (p.819 prob.7) Suppose you decide to travel to a star 90 light-years away. How fast would you have to travel so the distance would be only 25 light-years?
2. (p.819 prob.9) Suppose a news report stated that starship Enterprise had just returned from a 5-year voyage while traveling at 0.89c. 9a) If the report meant 5.0 years if Earth time, how much time elapsed on the ship? (b) If the report meant 5.0 years of ship time, how much time passed on Earth?
3. (p.820 prob.16) Escape velocity from the Earth is 40,000km/h. What would be the percent increase in mass of a 7.2 x 105-kg spacecraft traveling at that speed?
4. (p.820 prob.32) What is the speed and apparent rest mass of an electron when it hits a television screen after being accelerated by the 25,000V of the picture tube?