An artificial Earth satellite in an elliptical orbit has its greatest centripetal acceleration when it is at what location?
a. nearest the Earth
c. between Earth and Moon
b. farthest from the Earth
d. between Earth and Sun
A
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Approximately what core temperature is required before hydrogen fusion can begin in a star?
A) 10 million K B) 10,000 K C) 10 trillion K D) 10 billion K E) 1 billion K
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A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because
a. the coil acts like a transformer. b. the changing magnetic field induces an electric field in the wire. c. an electromagnetic wave is generated. d. the wire is ferromagnetic. e. none of the above
A 1.33 kg dense mass is on the end of a 4.50 m "string"
(a) What would be the period of the pendulum on Earth? (b) If the mass were doubled, what would be the frequency of oscillation? (c) What would be the period on the planet Mars where gravity is 38.% that of the Earth?