In which direction does the daily motion of the Moon occur in the sky, against the background stars, when viewed from the Earth?
a. Toward the west
b. Toward the east
c. Toward the north celestial pole in the summer and the south celestial pole in the winter
d. No predictable pattern can be discerned
B
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A parallel-plate capacitor stores charge Q. The capacitor is then disconnected from its voltage source, and the space between the plates is filled with a dielectric of constant ? = 2 . What is the relationship between the stored energies of the capacitor, where PEi is the initial stored energy, and PEf is the stored energy after the dielectric is inserted?
a. PEf = 0.25PEi b. PEf = 0.5PEi c. PEf = PEi d. PEf = 2PEi
Why does the abundance of iridium suggest that the iridium came from an impact?
A. Iridium is rare on Earth's surface but common in meteorites that have impacted the Earth. B. Iridium forms in forest fires, which were presumably ignited by the impact. C. Iridium can only be made under the high-pressure conditions of an impact. D. Iridium does not exist on Earth, so it must have come from space.
You put one ear on a steel railroad track while your friend a distance of 400 m away taps on the rail with a stone. You will hear the sound through the steel rail in _________ and through the air where the speed of sound is 344 m/s in _______
a. 0.08 s b. 0.5 s c. 1.2 s d. 2.4 s
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?
A) 0.161
B) 0.188
C) 0.0441
D) 0.0851
E) 0.103