Which one of the following quantities is at a maximum when an object in simple harmonic motion is at its maximum displacement?
a. speed
b. acceleration
c. kinetic energy
d. frequency
b
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When Nellie Newton hangs at rest in the middle of a clothesline, the tension will not be the same in each side of the rope when
A) the lengths of rope on each side are different. B) the angles at each side of the rope are unequal. C) she is in equilibrium. D) none of the above
Electric current is measured in which SI units?
a) watts. b) joules. c) amperes. d) coulombs.
Which of the following is not an exception to the general patterns in the solar system?
A) the "backward" rotation of Venus B) the relatively large size of Earth's Moon compared to Earth C) the fact that Saturn has rings D) the extreme axis tilt of Uranus E) the "backward" orbit of Triton around Neptune
Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a heat pump
What is its thermal efficiency when operated as a heat engine doing work? A) 10% B) 20% C) 25% D) 45% E) 80%