A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s2, and the Moon has no atmosphere
The height of the rock when it is descending with a speed of 20.0 m/s is closest to A) 115 m.
B) 125 m.
C) 135 m.
D) 145 m.
E) 154 m.
E
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The reason a life jacket helps keep you afloat is
A) the jacket makes you weigh less. B) the jacket has the same density as an average human. C) the jacket repels water. D) if you sink, the jacket sinks. E) the density of both you and the jacket together is less than your density alone.
Hot sand cools off faster at night than plants and vegetation, which indicates that the specific heat capacity of sand is
A) less than for plants. B) more than for plants. C) likely the same as for plants. D) not enough information
A rain cloud contains 2.66 × 10^7 kg of water vapor. How long would it take for a 2.0 kW pump to lift the same amount of water to an altitude of 2 000 m?
A pair of observers moving relative to one another will:
A. always agree on the ordering in time of two events B. always disagree about whether two events are simultaneous C. always disagree about the ordering in time of two events D. sometimes disagree about whether two events are simultaneous