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Chapter 2: Q20E (page 62)
Through a window in Carl's spaceship, passing al 0.5c, you watch Carl doing an important physics calculation. By your watch it takes him 1 min. How much time did Carl spend on his calculation?
The time spends by Carl in spaceship for calculation is.
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By how much (in picograms) does the mass of 1 mol of ice at differ from that of 1 mol of water at 0掳C?
If it is fundamental to nature that a given mass has a critical radius at which something extraordinary happens (i.e., a black hole forms), we might guess that this radius should depend only on mass and fundamental constants of nature. Assuming that depends only on M, G, and c, show that dimensional analysis gives the equation for the Schwarzschild radius to within a multiplicative constant.
You fire a light signal at north of west (a) Find the velocity component of this, signal according to an observer moving eastward relative to you at half the speed of light. From them. determine the magnitude and direction of the light signal's velocity according to this other observer. (b) Find the component according to a different observer, moving westward relative to you at half the speed of light.
At rest, a light source emits light. (a) As it moves along the line connecting it and Earth. observers on Earth see . What is the source's velocity (magnitude and direction)? (b) Were it to move in the opposite direction at the same speed. what wavelength would be seen? (c) Were it to circle Earth at the same speed. what wavelength would be seen?
In a television picture tube, a beam of electrons is sent from the back to the front (screen) by an electron gun. When an electron strikes the screen, il causes a phosphor to glow briefly. To produce an image across the entire screen. the beam is electrically deflected up and down and left and right. The beam may sweep from left to right at a speed greater than c. Why is this not a violation of the claim that no information may travel faster than the speed of light?
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