Chapter 9: 9.Q. 10 (page 227)
A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero? Explain
Work done on sprinter is negative
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Evaluate the dot product ,if
a. and
b.and
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?
A spring has an unstretched length of 10 cm. It exerts a restoring force F when stretched to a length of 11 cm.
a. For what length of the spring is its restoring force 3F?
b. At what compressed length is the restoring force 2F
In Problems through you are given the equation(s) used to solve a problem. For each of these, you are to
a. Write a realistic problem for which this is the correct equation(s).
b. Finish the solution of the problem.
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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