Chapter 9: Q. 6 (page 227)
A particle moving to the left is slowed by a force pushing to the right. Is the work done on the particle positive or negative? Or is there not enough information to tell? Explain.
Work done on the particle is negative
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You need to raise a heavy block by pulling it with a massless rope. You can either (a) pull the block straight up height h, or (b) pull it up a long, frictionless plane inclined at a 15 o angle until its height has increased by h. Assume you will move the block at constant speed either way. Will you do more work in case a or case b? Or is the work the same in both cases? Explain.
The driver of a car traveling at 60 mph slams on the brakes, and the car skids to a halt. What happened to the kinetic energy the car had just before stopping?
A kg mass hanging from a spring scale is slowly lowered onto a vertical spring, as shown in the FIGURE. The scale reads in newtons.
a. What does the spring scale read just before the mass touches the lower spring?
b. The scale reads N when the lower spring has been compressed by cm. What is the value of the spring constant for the lower spring?
c. At what compression will the scale read zero?
An electric dipole consists of two equal but opposite electric charges, +q and -q, separated by a small distance d. If another charge Q is distance x from the center of the dipole, in the plane perpendicular to the line between +q and -q, and if x W d, the dipole exerts an electric force on charge Q, where K is a constant. How much work does the electric force do if charge Q moves from distance ?
You’re fishing from a tall pier and have just caught a fish. As it breaks the surface, essentially at rest, the tension in the vertical fishing line is . Use work and energy to find the fish’s upward speed after you’ve lifted it
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