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The two ropes seen in FIGURE are used to lower a kg piano m from a second-story window to the ground. How much work is done by each of the three forces?
A 2.0 kg book is lying on a 0.75-m-high table. You pick it up and place it on a bookshelf 2.25 m above the floor.a. How much work does gravity do on the book?b. How much work does your hand do on the book?
The force acting on a particle is . How much work does this force do as the particle moves along the x-axis from to ?
Which has the larger kinetic energy, a 10 g bullet fired at500 m/s or a 75 kg student running at 5.5 m/s?
At midday, solar energy strikes the earth with an intensity of about kW/m2 . What is the area of a solar collector that could collect MJ of energy in h? This is roughly the energy content of gallon of gasoline.
A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero? Explain
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