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Chapter 36: Q. 38 (page 1060)
At what speed, as a fraction of c, must an electron move so that its total energy is 10% more than its rest mass energy?
The speed of electron is 0.417c.
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A long train is heading for an long tunnel. If the train moves sufficiently fast, is it possible, according to experimenters on the ground, for the entire train to be inside the tunnel at one instant of time? Explain.
A newspaper delivery boy is riding his bicycle down the street at . He can throw a paper at a speed of . What
is the paper’s speed relative to the ground if he throws the paper (a) forward, (b) backward, and (c) to the side?
An electron moving to the right atcollides with a positron moving to the left at. The two particles annihilate and produce two gamma-ray photons. What is the wavelength of the photons?
FIGURE Q36.6 shows a rocket traveling from left to right. At the instant it is halfway between two trees, lightning simultaneously (in the rocket’s frame) hits both trees.
a. Do the light fleshes reach the rocket pilot simultaneously? If not, which reaches her first? Explain
b. A student was sitting on the ground halfway between the trees as the rocket passed overhead. According to the student, were the lightning strikes simultaneous? If not, which tree was hit first? Explain.
A starship blasts past the earth at . Just after passing the earth, it fires a laser beam out the back of the starship. With what speed does the laser beam approach the earth?
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