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Chapter 9: Q.13 (page 228)
Evaluate the dot product ,if
a. and
b.and
a.
b.
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A particle moves in a vertical plane along the closed path seen in FIGURE Q9.7, starting at A
and eventually returning to its starting point. Is the work done by gravity positive, negative, or
zero? Explain.
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 ?
The human heart pumps the average adult鈥檚 of blood through the body every minute. The heart must do work to overcome frictional forces that resist blood flow. The average adult blood pressure is
a. How much work does the heart do to move the of blood completely through the body?
b. What power output must the heart have to do this task once a minute?
Hint: When the heart contracts, it applies force to the blood. Pressure is Model the circulatory system as a single closed tube, with cross-section area and volume filled with blood to which the heart applies a force.
A kg softball player slides into second base, generating J of thermal energy in her legs and the ground. How fast was she running?
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?
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