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Chapter 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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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.
A elevator accelerates upward at for , starting from rest.
a. How much work does gravity do on the elevator?
b. How much work does the tension in the elevator cable do on the elevator?
c. What is the elevator’s kinetic energy after traveling
The two ropes seen in FIGURE 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?
What is the angle between vectors and in each part of
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?
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