Newton concluded that a force from the Earth had to act on the Moon because
a. a force is needed to keep the Moon in motion in its orbit.
b. a force is needed to pull the Moon outward.
c. a force is needed to accelerate the Moon toward Earth away from straight-line motion.
d. the Moon moved at a constant velocity in a straight line.
e. All of the other choices are correct.
c
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A projectile's vertical velocity component
a. changes most rapidly near the top of its trajectory. b. changes at a constant rate. c. changes most rapidly near the bottom of its trajectory. d. does not change.
Carbon-14 dating can reliably date ancient archeological samples up to approximately how many years?
A) 100 million B) 50 thousand C) 5 million D) 10 billion E) 5 thousand
We can see each other in the classroom right now because we
A) emit visible light. B) emit thermal radiation. C) emit infrared light. D) reflect visible light. E) reflect infrared light.
What date is the autumnal equinox for the Southern hemisphere?
a. December 21 b. September 22 c. June 22 d. March 20 e. December 25