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Chapter 9: Q. 4 (page 227)
The rope in FIGURE Q9.4 pulls the box to the left across a rough surface. Is the
work done by tension positive, negative, or zero? Explain.
Work done is positive .
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A 0.2 kg plastic cart and a 20 kg lead cart both roll without friction on a horizontal surface. Equal forces are used to push both carts forward a distance of 1 m, starting from rest. After traveling 1 m, is the kinetic energy of the plastic cart greater than, less than, or equal to the kinetic energy of the lead cart? Explain.
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?
In Problems 67 through 69 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. Draw a pictorial representation.
c. Finish the solution of the problem
A kg sprinter, starting from rest, runs m in s at constant acceleration.
a. What is the magnitude of the horizontal force acting on the sprinter?
b. What is the sprinter’s power output at s, s, and s?
A pile driver lifts a weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of drives the pipe in . What is the average force exerted on the pipe?
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