A clerk can lift containers a vertical distance of 1 m or can roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force required is about
A) half as much.
B) twice as much.
C) the same.
A
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Which of the following statements about fusion is the most accurate?
A. Fission releases more energy than fusion. B. The mass of the reactants is less than the mass of the products. C. A nuclear fusion will always release energy. D. Overcoming the strong nuclear force results in the release of a large amount of energy. E. The mass of the products is less than the mass of the reactants.
Volcanic island chains forms over hot spots when the
A. tectonic plate carrying the volcanoes travels over the stationary hot spot. B. hot spot expands. C. hot spot travels. D. all of these
Passive continental margins are sometimes referred to Atlantic-type margins
Indicate whether the statement is true or false
During the end Permian mass extinction, the slowing of sea floor spreading resulted in an increase of the world's ocean basins, causing sea level to drop about ________.
A. 150m (492ft) B. 100m (328ft) C. 75m (246ft) D. 200m (660ft)