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A 5.09 × 10^14-hertz electromagnetic wave is traveling through a transparent medium. The main factor that determines the speed of this wave is the
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
If PE is the gravitational potential energy of A relative to the ground, then the gravitational potential energy of B relative to the ground is
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
A motor does a total of 480 joules of work in 5.0 seconds to lift a 12-kilogram block to the top of a ramp. The average power developed by the motor is
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
A 5.8 × 10^4-watt elevator motor can lift a total weight of 2.1 × 10^4 newtons with a maximum constant speed of
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
A horizontal force of 20 newtons eastward causes a 10-kilogram box to have a displacement of 5 meters eastward. The total work done on the box by the 20-newton force is
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
A light wave strikes the Moon and reflects toward Earth. As the light wave travels from the Moon toward Earth, the wave carries
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
A block initially at rest on a horizontal, frictionless surface is accelerated by a constant horizontal force of 5.0 newtons. If 15 joules of work is done on the block by this force while accelerating it, the kinetic energy of the block increases by
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
What is the kinetic energy of a 55-kilogram skier traveling at 9.0 meters per second?
nature of the medium
15 J
100 J
2.2 × 10^3 J
energy, only
96 W
2PE
2.8 m/s
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