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Together, two students exert a force of 640 N in pushing a car a distance of 30 m.
(a) How much work do the students do on the car?
J
(b) If the force was doubled, how much work would they do pushing the car the same distance?
(c) An electric motor develops 57 kW of power as it lifts a loaded elevator 16.5 m in 35 s. How much force does the motor exert?
N
A cube made of steel 0.300 meters on a side is suspended from a scale until it is completely immersed in fresh water
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