Isotopic evidence for the presence significant quantities of liquid water on Mars in the past comes from the observation of
A) an elevated ratio of deuterium to hydrogen
B) an elevated ratio of hydrogen to deuterium
C) a complete absence of hydrogen in the atmosphere
D) a complete absence of deuterium in the atmosphere
A
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A given net force propels an object along a straight-line path. If the net force were doubled, its acceleration would
A) quadruple. B) double. C) stay the same. D) be half. E) none of the above
A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time
The direction of the acceleration of an object moving in a circle at constant speed is
a. changing, but pointing in a predictable direction. b. constant and pointing in only one direction. c. constant and pointing in two directions. d. none of these
If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out. This happens because an outward force balances the pull of Earth on the water
A) True B) False