A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball?
A) 38.7 m/s2 B) 74.2 m/s2 C) 29.3 m/s2 D) 67.9 m/s2 E) 14.8 m/s2
A
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The energy associated with random atomic and molecular motion is known as
A) thermal energy B) radiative energy C) mass-energy D) potential energy
Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to that emitted by object A?
A) 1.7 B) 2.8 C) 81 D) 17 E) 21
Most of the atoms in the universe are thought to be
A) hydrogen. B) helium. C) about equal amounts of hydrogen and helium. D) iron. E) elements unknown at present.
Length Contraction: Two stars are at rest relative to each other. In their common rest frame, these stars are 90.0 light-years apart. If they are measured to be 68.7 light-years apart by the navigator of a spaceship traveling between them, how fast is the spaceship moving relative to these stars?
A. 0.646c B. 0.604c C. 0.558c D. 0.505c