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Chapter 9: Q.7 (page 227)
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?
Net work done is Zero
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A g bug is hovering in the air. A gust of wind exerts a force role="math" localid="1648061852575" N on the bug.
a. How much work is done by the wind as the bug undergoes displacement m?
b. What is the bug’s speed at the end of this displacement? Assume that the speed is due entirely to the wind.
A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface. How much work is done by
(a) tension and (b) gravity?
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 kg particle moving along the axis experiences the force shown in FIGURE. The particle’s velocity is m/s at m. What is its velocity at m and m?
The motor of a crane uses power P to lift a steel beam. By what factor must the motor’s power increase to lift the beam twice as high in half the time?
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