A particle of kinetic energy 50 eV in free space travels into a region with a potential well of depth 40 eV. What happens to its speed?
A)
It remains the same.
B)
It increases in the region of the well.
C)
It decreases in the region of the well.
D)
It cannot be determined from the information given.
B
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What will be an ideal response?
What is a beat in terms of the physics of sound?
a. The rhythm of a drummer. b. A repeated sound pulse through a vibrating system. c. The sound of a metronome used to help play the instrument at a steady pace. d. A periodic variation in volume caused by superimposing sounds of two similar frequencies. e. A single sound pulse through a vibrating system.
Two stones, one of mass m and the other of mass 2m, are thrown directly upward with the same velocity at the same time from ground level and feel no air resistance. Which statement about these stones is true?
A) The heavier stone will go twice as high as the lighter one because it initially had twice as much kinetic energy. B) Both stones will reach the same height because they initially had the same amount of kinetic energy. C) At their highest point, both stones will have the same gravitational potential energy because they reach the same height. D) At its highest point, the heavier stone will have twice as much gravitational potential energy as the lighter one because it is twice as heavy. E) The lighter stone will reach its maximum height sooner than the heavier one.
A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When this force equals the weight of the fireman, what happens?
A) The fireman comes to a stop. B) The fireman descends with slower and slower speed. C) The fireman descends with a smaller acceleration. D) The fireman continues to descend, but with constant speed. E) Cannot be determined without additional information.