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Chapter 36: Q. 17 (page 1059)
At what speed, as a fraction of would a round-trip astronaut “lose” of the elapsed time shown on her watch?
At speed of a round-trip astronaut “lose” of the elapsed time shown on her watch.
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Two rockets approach each other. Each is traveling atin the earth’s reference frame. What is the speed, as a fraction of , of one rocket relative to the other?
The nuclear reaction that powers the sun is the fusion of four protons into a helium nucleus. The process involves several steps, but the net reaction is simply . The mass of a proton, to four significant figures, is , and the mass of a helium nucleus is known to be .
a. How much energy is released in each fusion?
b. What fraction of the initial rest mass energy is this energy?
What is the speed, as a fraction of , of a particle whose momentum is ?
As the meter stick in FIGURE Q36.8 flies past you, you simultaneously measure the positions of both ends and determine that
a. To an experimenter in frame S′, the meter stick’s frame, did you make your two measurements simultaneously? If not, which end did you measure first? Explain.
b. Can experimenters in frame S′ give an explanation for why your measurement is less than 1 m.
Two rockets, and , approach the earth from opposite directions at speed of . The length of each rocket measured in its rest frame is . What is the length of rocket as measured by the crew of rocket ?
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