A spinning ice skater is able to control the rate at which she rotates by pulling in her arms. We can best understand this effect by observing that in this process:
A) her angular momentum remains constant.
B) her moment of inertia remains constant.
C) her kinetic energy remains constant.
D) her total velocity remains constant.
E) she is subject to a constant non-zero torque.
A
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The strong nuclear force is involved in:
A) binding together atomic nuclei. B) developing the majority of nuclear energy. C) the radioactive decay of certain kinds of nuclear particles. D) the attraction of atomic nuclei over macroscopic distances.
At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. they coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point
The nucleus of an atom contains
a. protons c. electrons b. neutrons d. all of the above
Diverging lenses have negative focal lengths
Indicate whether the statement is true or false