1AcQuiz3 - Physics 1A (c) Fall 2006: Quiz 3 Version D 1...

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Version D 1 10.29.06 Closed book. No work needs to be shown for multiple-choice questions. 1 . Yuri, a Russian weightlifter, is able to lift 250 kg to a height of 2.00 m in 2.00 s. What is his power output? a. 500 W b. 9.80 kW c. 2.45 kW d. 4.90 kW 2 . What is the kinetic energy of a 0.135-kg baseball thrown at 40.0 m/s? a. 216 J b. 54.0 J c. 87.0 J d. 108 J 3 . A ball is thrown straight up to a height of 40 m above its original height. With what velocity does the ball leave the hand? a. 28 m/s b. 14 m/s c. 7.0 m/s d. 20 m/s 4 . A worker pushes a wheelbarrow with a horizontal force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? a. 96 J b. 240 J c. 144 J d. 216 J 5 . A Hooke’s law spring is compressed 12.0 cm from equilibrium and the potential energy stored is 72.0 J. What is the spring constant in this case? a. 10 000 N/m
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1AcQuiz3 - Physics 1A (c) Fall 2006: Quiz 3 Version D 1...

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