After a rock thrown straight up reaches the top of its path and then falls a short distance, its acceleration is (neglect air resistance)
A) greater than at the top of its path.
B) less than at the top of its path.
C) the same as at the top of its path.
Answer: C
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What are sinuous rilles found on the lunar surface?
a. ancient lava flows b. channels cut by flowing lava on the edge of the maria c. large basins once filled with water d. light-colored rock found in the lunar highlands e. fault lines found within the crust
Why do Earth and Venus have active interiors, while Mercury and Mars do not?
A. Earth and Venus have rapid rotations, while Mercury and Mars do not. B. Earth and Venus are much more massive, and cool more slowly, than Mars and Mercury. C. Mercury and Mars have small iron cores, while Earth and Venus have large ones. D. All of these choices are correct. E. None of these choices is correct.
To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
Object A has twice as much mass as object B. If you exert the same force on these two objects, how do their accelerations compare?
A) Object A has half as much acceleration as object B. B) Object A has four times as much acceleration as object B. C) Object A has twice as much acceleration as object B. D) They both have the same acceleration. E) It is impossible to answer this without further details concerning the composition of the two object.