oldhw 10 - alexander (jra2623) oldhomework 10 Turner...

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Unformatted text preview: alexander (jra2623) oldhomework 10 Turner (92510) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The earth exerts a force of 1800 N on an or- biting communications satellite that is 38 mi above the Earth. What is the magnitude of the force the satellite will exert on the earth? Correct answer: 1800 N. Explanation: According to Newtons Third Law of Mo- tion, the satellite exerts the same magnitude force on the earth that the earth exerts on the satellite. The two force are equal and opposite in direction. 002 (part 1 of 2) 10.0 points A child holds a sled on a frictionless, snow- covered hill, inclined at an angle of 33 . 8 6 N F 33 If the sled weighs 86 N, find the force ex- erted on the rope by the child. Correct answer: 46 . 839 N. Explanation: Given : W = 86 N and = 33 . Consider the free body diagram for the block m g s i n N = m g c o s F W Basic Concepts: If we tilt our world, and consider the forces parallel to the hill, F net = summationdisplay F up- summationdisplay F down = 0 then the forces perpendicular to the hill, F net = summationdisplay F out- summationdisplay F in = 0 Solution: Consider the free body diagram for the sled: The weight of the sled has compo- nents W sin acting down the hill and W cos acting straight into the hill....
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This note was uploaded on 10/20/2011 for the course PHY 302K taught by Professor Kaplunovsky during the Summer '08 term at University of Texas at Austin.

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oldhw 10 - alexander (jra2623) oldhomework 10 Turner...

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