If a child swinging to and fro on a playground swing stands up, her time for a to-and-fro swing is
A) longer.
B) shorter.
C) unchanged.
Answer: B
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A small planet having a radius of 1000 km exerts a gravitational force of 100 N on an object that is 500 km above its surface. If this object is moved 500 km farther from the planet, the gravitational force on it will be closest to
A) 75 N. B) 71 N. C) 56 N. D) 50 N. E) 25 N.
That the moon has no magnetic field implies that
a. the moon is spinning too slowly to produce a magnetic field. b. the interior of the moon is too hot to produce a magnetic field. c. the crust of the moon is so thick that the magnetic field can not get out of the interior. d. the moon's core contains little if any molten iron. e. the moon is moving further from Earth.
During a lunar eclipse, the Moon's phase must be
A) first quarter. B) third quarter. C) full. D) new.
Internal energy is greater in a
A) cup of boiling-hot tea. B) fire-engine pail of boiling-hot tea. C) both the same