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# 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 Newton’s 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 θ = 33 ◦ . Consider the free body diagram for the block m g s i n θ N = m g c o s θ 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 θ acting down the hill and W cos θ acting straight into the hill....
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oldhw 10 - alexander(jra2623 – oldhomework 10 – Turner...

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