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Chapter 7: Q9 CQ (page 258)
What is conservative force?
The force for which the work done does not depend on the path taken is known as conservative force.
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A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 25.0潞 below the horizontal.
(a) What is the work done on the cart by friction?
(b) What is the work done on the cart by the gravitational force?
(c) What is the work done on the cart by the shopper?
(d) Find the force the shopper exerts, using energy considerations.
(e) What is the total work done on the cart?
(a) What force must be supplied by an elevator cable to produce an acceleration of 0.800 m/s2 against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg?
(b) How much work is done by the cable in lifting the elevator 20.0 m?
(c) What is the final speed of the elevator if it starts from rest?
(d) How much work went into thermal energy?
(a) What is the power output in watts and horsepower of a 70.0-kg sprinter who accelerates from rest to 10.0 m/s in 3.00 s?
(b) Considering the amount of power generated, do you think a well-trained athlete could do this repetitively for long periods of time?
A hydroelectric power facility (see Figure 7.38) converts the gravitational potential energy of water behind a dam to electric energy.
(a) What is the gravitational potential energy relative to the generators of a lake of volume , given that the lake has an average height of 40.0 m above the generators?
(b) Compare this with the energy stored in a 9-megaton fusion bomb.
(a) How long can you rapidly climb stairs\(\left( {116/{\rm{min}}} \right)\)on the\(93.0{\rm{ kcal}}\)of energy in a\(10.0 - {\rm{g}}\)pat of butter?
(b) How many flights is this if each flight has\(16\)stairs?
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