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exam2key - Name: _ PERM #: _ PHYSICS 6A-EXAM II V ERSION A...

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Name: _______________________________ Seat: ___________________ PERM #: _____________________________ Lab TA: ___________________ PHYSICS 6A-EXAM II – VERSION A 1. (5 points) Consider what happens when you jump up in the air. Which of the following is the most accurate statement? A) It is the upward force exerted by the ground that pushes you up, but this force can never exceed your weight. B) You are able to spring up because the earth exerts a force upward on you which is stronger than the downward force you exert on the earth. C) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself which propels the body into the air. D) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. Answer: D 2. (7 points) If I weigh 649 N on Earth and 5320 N on the surface of a nearby planet, what is the acceleration due to gravity on that planet? A) 80.3 m/s 2 B) 58.6 m/s 2 C) 69.9 m/s 2 D) 92.3 m/s 2 Answer: A 3. (5 points) Two iceboats (one of mass m, one of mass 2m) hold a race on a frictionless, horizontal, frozen lake. Both iceboats start at rest, and the wind exerts the same constant force on both iceboats. Which iceboat crosses the finish line with more kinetic energy (KE)? A) The iceboat of mass m: it has twice as much KE as the other.
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exam2key - Name: _ PERM #: _ PHYSICS 6A-EXAM II V ERSION A...

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