It takes 10 J of work to push a charge into an electric field. Relative to its starting position it has gained a potential energy of
A) less than 10 J.
B) 10 J.
C) more than 10 J.
D) none of the above
Answer: B
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Two in-phase loudspeakers are 3.0 m apart. They emit sound with a frequency of 490 Hz
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The meter was defined originally as
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A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the opposite direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
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