Today, the U.S. imports about what percentage of the oil it uses?
a. 10% b. 25% c. 40% d. 60% e. 80%
d
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A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into the room per cycle. What is the coefficient of performance?
A. 4 J B. 20 J C. 24 J D. 44 J
Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/s2?
A) 86. lb B) 1.4 × 102 lb C) 1.2 × 102 lb D) 96. lb E) 1.56 × 102 lb
The reason the wavelike nature of a moving baseball is not noticed in everyday life is that
A) it doesn't have a wavelike nature. B) its wavelength is too small. C) its frequency is too small. D) its energy is too small. E) its speed is too small.
An object of mass 4 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in Fig. 8-9
If the speed of the object at the bottom of the inclined plane is 10 m/s, how much work is done by the force of friction? Use g = 10 m/s2. A) -100 J B) 100 J C) 0 D) -200 J E) 200 J