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Chapter 9: Q. 38 (page 228)
How much energy is consumed by
(a) a kW hair dryer used for min and
(b) a W night light left on for h?
a). Energy consumed by hairdryer J
b). Energy consumed by night lightJ
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A -cm-long spring is attached to the ceiling. When a kg mass is hung from it, the spring stretches to a length of cm.
a. What is the spring constant?
b. How long is the spring when a 3.0 kg mass is suspended from it?
FIGURE is the force-versus-position graph for a particle moving along the axis. Determine the work done on the particle during each of the three intervals m, m, and m.
A 25 kg box sliding to the left across a horizontal surface is brought to a halt in a distance of 35 cm by a horizontal rope pulling to the right with 15 N tension. How much work is done by (a) tension and (b) gravity?
Astronomers using a -m-diameter telescope observe a distant supernova鈥攁n exploding star. The telescope鈥檚 detector records of light energy during the first 10 s. It鈥檚 known that this type of supernova has a visible-light power output of for the first 10 s of the explosion. How distant is the supernova? Give your answer in light years, where one light year is the distance light travels in one year. The speed of light is .
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 ?
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