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Chapter 9: Q. 18 (page 228)
The two ropes are used to lower a 255 kg piano 5.00 m from a second-story window to the ground. How much work is done by each of the three forces?
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The motor of a crane uses power P to lift a steel beam. By what factor must the motor鈥檚 power increase to lift the beam twice as high in half the time?
A kg air compressor is dragged up a rough incline from m to m, where theaxis is vertical. How much work does gravity do on the compressor during this displacement?
A 20 g particle is moving to the left at 30 m/s. A force on the particle causes it to move the the right at 30 m/s. How much work is done by the force?
If a particle鈥檚 speed increases by a factor of 3, by what factor does its kinetic energy change?
A spring of equilibrium length and spring constant hangs from the ceiling. Mass is suspended from its lower end. Then a second spring, with equilibrium length and spring constant , is hung from the bottom of . Mass is suspended from this second spring. How far is below the ceiling?
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