Which of the following statements is true (only one):
a. The growth rate of energy consumption has kept pace with GNP growth.
b. Oil use has expanded more than any other fuel since 1940.
c. We reached the point last year where we imported no oil.
d. Electricity use has actually fallen since 1975.
b
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A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. Assume that the angular acceleration is constant during the 5.0-s interval. How many radians does the wheel turn through during the 5.0-s interval?
a. 95 rad b. 85 rad c. 65 rad d. 75 rad e. 125 rad
The temperature of the layer of gas that produces the visible light of the Sun is
A) 3,500 K B) 5,800 K C) 12,300 K D) 300,000 K E) 15 million K
The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A) 2.0 B) 1.7 C) 0.87 D) 1.2
When fast electrons strike a metal target, what are produced?
a. Radio waves b. Gamma rays c. X-rays d. Microwaves