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A motorcyclist, initially traveling east at 15 meters per second, accelerates uniformly at a rate of 3.0 meters per second squared east to a velocity of 21 meters per second east. How far does the motorcyclist travel while accelerating?
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
An electric motor with a power rating of 6.48 x 10^4 watts is used to raise an elevator weighing 2.80 x 10^4 newtons at constant speed. What is the total time required for the motor to raise the elevator a vertical distance of 20.0 meters?
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
Compared to the frequency of the sound emitted by the siren, the frequency of the sound observed by the person during this event is
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
A battery-powered electric motor is used to cause the wheels of a toy car to rotate. In this motor, there is a conversion of
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
Which statement describes the motion of the block?
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
The magnitude of an unbalanced force applied to a 4.0-kilogram crate is 10. newtons. If the magnitude of this applied unbalanced force is doubled, the inertia of the crate is
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
Which terms identify two scalar quantities?
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
A 60.-kilogram man is pushing a 30.-kilogram lawn mower. Compared to the magnitude of the force exerted on the lawn mower by the man, the magnitude of the force exerted on the man by the lawn mower is
unchanged
energy and time
the same
electric energy to mechanical energy
first higher and then lower
8.64 s
36 m
The block is moving to the right with constant speed.
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