Which internal energy source(s) produce(s) heat by converting gravitational potential energy into thermal energy?
A) accretion
B) differentiation
C) radioactivity
D) both accretion and differentiation
E) all three of accretion, differentiation, and radioactivity
D) both accretion and differentiation
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An observer is moving in space toward a distant star at 50.0 km/s while the star is moving toward the observer at 180 km/s; the relative velocity being 230 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10^5 km/s)
a. 0.077% increase b. 0.077% decrease c. 0.026% increase d. 0.23% decrease e. 0.23% increase
When a charged cloud passes overhead, the ground below is charged by
a. induction. b. polarization. c. deduction. d. electrification.
Poor weather is generally associated with
a) a high-pressure region b) a cyclone. c) the Coriolis force. d) a stationary front.
Which of these periodic motions are simple harmonic?
a. a child swinging on a playground swing (? = 45°) b. a CD rotating in a player c. an oscillating clock pendulum (? = 10°)