A runaway railroad car, with mass 30 × 10^4 kg, coasts across a level track at 2.0 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 4.0 × 10^6 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)
a. 0.77 m
c. 0.34 m
b. 0.55 m
d. 1.07 m
B
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A very long string is tied to a rigid wall at one end while the other end is attached to a simple harmonic oscillator. Which of the following can be changed by changing the frequency of the oscillator?
a. The speed of the waves traveling along the string. b. The tension in the string. c. The wavelength of the waves on the string. d. All of the above. e. None of the above.
Saturn's rings are
a. composed of ice particles. b. in the plane of the planet's equator. c. within the planet's Roche limit. d. all of the above e. none of the above
What do we mean by time dilation in relativity?
A) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone. B) It is the idea that relativity makes time dilate, or expand, for people who study it. C) It is a hallucinogenic effect experienced by people who take too much of something. D) It is the idea that time really runs slower in reference frames moving relative to you.
Two particles collide, one of them initially being at rest. Is it possible for both particles to be at rest after the collision?
a. If the collision is perfectly inelastic, then this happens. b. If the collision is elastic, then this happens. c. This can happen sometimes if the more massive particle was at rest. d. No.