When two tectonic plates collide:
A) they both stop moving.
B) they always produce high mountain chains like the Himalayas.
C) volcanoes always mark the boundary between them.
D) they continue moving, producing a variety of large deformations.
E) that region is safe from earthquakes now the plates are fixed.
D
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Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. Assuming there is no air resistance, when they hit the ground
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70-meter mark. (a) What is the runner's speed? (b) How far would the runner go in 8 seconds if this speed is maintained? (c) How long did it take the runner to cover the first 40 m (assuming the same speed was maintained)?
Calculate the speed at which a 0.723-kg object has the same momentum as a 1.30-kg object that is moving 0.515c
A) 0.734c B) 0.712c C) 0.981c D) 0.592c
A person has a mass of 45 kg. How much does she weigh?
A) 4.6 N B) 20 N C) 99 N D) 220 N E) 440 N