A red shift for light indicates that the light source is moving
A) toward you.
B) away from you.
C) both of these
D) neither of these
Answer: B
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Consider a flat steel plate with a hole through its center as shown in Fig.17-1. When the plate's temperature is decreased, the hole will
A) contract only if it takes up more than half the plate's surface area. B) expand if it takes up less than half the plate's surface area. C) contract. D) expand. E) remain the same size.
Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2 . The magnitude of the velocity of the center of mass of this system of two bodies is
a. less than v1. b. equal to v1. c. equal to the average of v1 and v2. d. greater than v1 and less than v2. e. greater than v2.
A uniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. What is its kinetic energy?
A) 0.18 J B) 0.092 J C) 0.96 J D) 1.1 J E) 17 J
Today, the energy resource that supplies the United States with the greatest amount of electricity is
A) oil. B) coal. C) nuclear. D) hydroelectric. E) natural gas.