An empty jar is pushed open-side downward into water so that trapped air cannot escape. As it is pushed deeper, the buoyant force on the jar
A) increases.
B) decreases.
C) increases, then decreases.
D) decreases, then increases.
E) remains the same.
Answer: B
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Periods are divided into
a. eons. b. epochs. c. millennia. d. eras.
When a Hooke's law spring is stretched a distance 3x, how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x
a. It is 3 times as much. c. It is 4 times as much. b. It is 8 times as much. d. It is 9 times as much.
The magnetic force on a charged particle moving at a constant speed in a uniform magnetic field will be doubled when the angle between the velocity of the particle and the direction of the magnetic field changes from 25.0° to
a. 57.7°. c. 12.2°. b. 12.5°. d. 50.0°.