You do work on a cart loaded with groceries. If you do this work in one-third the usual time, you expend
A) one third as much power.
B) the usual power.
C) three times the usual power.
D) need more information.
Answer: C
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Organisms which have evolved to survive under severe environmental conditions are referred to as
A) tortuophiles B) acutophiles C) extremophiles D) extremophobes
Even though K- and M-type stars are suitable for life, why might they not have many habitable planets around them?
A) because their habitable zones are very wide B) because their habitable zones are very narrow C) because their lifetimes are too short D) because they contain too few heavy elements to form planets
Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John stays in the air
A) 0.50 times as long as Harry. B) the same time as Harry. C) twice as long as Harry. D) three times as long as Harry. E) four times as long as Harry.
Galileo's use of inclined planes allowed him to effectively
A) slow down the ball's changes in speed. B) reduce the time of the ball's changes in speed. C) eliminate all changes in speed. D) eliminate friction.