WorkEnergyHW_Chap05

WorkEnergyHW_Chap05 - Version PREVIEW – Work Chap. 5 –...

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Unformatted text preview: Version PREVIEW – Work Chap. 5 – sizemore – (13756) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Batman on the Rope 001 10.0 points Batman, whose mass is 117 kg, is holding on to the free end of a 16 . 6 m rope, the other end of which is fixed to a tree limb above. He is able to get the rope in motion as only Batman knows how, eventually getting it to swing enough that he can reach a ledge when the rope makes a 74 . 4 ◦ angle with the vertical. The acceleration of gravity is 9 . 8 m / s 2 . How much work was done against the force of gravity in this maneuver? Correct answer: 13915 . 1 J. Concept 07 28 002 (part 1 of 2) 10.0 points If a golf ball and a ping-pong ball both move with the same kinetic energy, which has the greater speed? 1. the ping-pong ball correct 2. The two balls have the same speed. 3. Cannot be determined 4. the golf ball 003 (part 2 of 2) 10.0 points In a gaseous mixture of massive molecules and light molecules with the same average KE, which have the greater speed? 1. the light molecules correct 2. They have the same speed. 3. Cannot be determined 4. the massive molecules Conceptual 08 07 004 (part 1 of 2) 10.0 points Georgie was pulling her brother (of mass 18 . 5 kg) in a 13 . 6 kg sled with a constant force of 20 N for one block (78 m). How much work did Georgie do? Correct answer: 1560 J. 005 (part 2 of 2) 10.0 points How long would a 200 W lightbulb have to glow to produce the same amount of energy expended by Georgie? Correct answer: 7 . 8 s. Conceptual 08 15 006 10.0 points You leave your 75 W portable color TV on for 6 hours each day and you do not pay attention to the cost of electricity. If the dorm (or your parents) charged you for your electricity use and the cost was $0 . 2 / kW · h, what would be your monthly (30 day) bill? Correct answer: 2 . 7 dollars. Conceptual 08 Q13 007 10.0 points According to the work-energy theorem, if work is done on an object, its potential and/or kinetic energy changes. Consider a car that accelerates from rest on a flat road. What force did the work that increased the car’s kinetic energy? 1. gravity 2. air resistance 3. the friction between the road and the tires correct 4. the force of the car engine Dogsled Race 008 (part 1 of 2) 10.0 points A team of dogs drags a 141 kg sled 1 . 8 km over a horizontal surface at a constant speed. The coefficient of friction between the sled and the Version PREVIEW – Work Chap. 5 – sizemore – (13756) 2 snow is 0 . 219. The acceleration of gravity is 9 . 8 m / s 2 . Find the work done by the dogs. Correct answer: 544 . 706 kJ. 009 (part 2 of 2) 10.0 points Find the energy lost due to friction....
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This note was uploaded on 04/23/2011 for the course PHYS 2425 taught by Professor Darek during the Spring '09 term at University of Texas.

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WorkEnergyHW_Chap05 - Version PREVIEW – Work Chap. 5 –...

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