When a proton is traveling at 0.80c, what is the ratio of its kinetic energy to its rest energy?
A) 0.60
B) 0.67
C) 0.80
D) 1.2
E) 1.7
B
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A wave has a period 2.00 s, an amplitude 20.0 cm, and a wavelength 3.00 m. What is the speed of the wave?
A) 10.0 cm/s B) 1.50 m/s C) 340 m/s D) 0.100 cm/s E) 0.667 m/s
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Kinetic energy is conserved
a. True b. False Indicate whether the statement is true or false
Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has 1/3 the resistance of the shorter wire. C) The longer wire has 3 times the resistance of the shorter wire. D) The longer wire has 9 times times the resistance of the shorter wire. E) The longer wire has 27 times times the resistance of the shorter wire.
The first spacecraft to land on the surface of an asteroid was named
A) Dawn. B) NEAR. C) Hayabusa. D) Stardust. E) Giotto.