What happens to centripetal force when speed decreases, in the special case that the object continues moving in a circle of the same radius?
a. The force also decreases.
b. The force increases.
c. The radius cannot stay the same.
d. The force sometimes stays the same and sometimes decreases.
e. Speed does not affect centripetal force.
a
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An ore car of mass 4 900 kg rolls downhill on tracks from a mine. At the end of the tracks, 13.5 m lower in elevation, is a spring with k = 410 000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction
a. 1.26 m b. 0.889 m c. 1.78 m d. 0.568 m e. 0.484 m
The nucleus makes up about what percentage of
the mass of an atom? a) 25% b) 50% c) 81.3% d) more than 99%
The Hubble Space Telescope objective mirror is not affected by
a. bad seeing. b. chromatic aberration. c. diffraction. d. chromatic aberration and diffraction. e. bad seeing and chromatic aberration.
Which of the following choices is not a way by which we can study the inside of the Sun?
A) We can send a space probe into the Sun's photosphere. B) We can probe the interior of the Sun by studying the vibrations in its photosphere. C) We can make a computer model of the Sun's interior that allow us to predict the observable properties of the Sun. D) We can study solar neutrinos.