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# solution_pdf11 - reddy(ar38357 Tension and inclined planes...

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reddy (ar38357) – Tension and inclined planes – clancy – (SCI411-2) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Can an object be in mechanical equilibrium when only a single Force acts on it? Explain. 1. None oF these 2. No; even one Force is too much. There should be no Forces acting on an object. 3. No; at least one other Force is needed to cancel the action oF the frst Force. correct 4. Yes; a single Force is necessary to keep the object in mechanical equilibrium. 5. Yes; the object will act back with an equal and opposite Force. Explanation: The sum oF the Forces acting on an object in equilibrium has to equal zero. Since only a single Force acts on the object, it cannot be in equilibrium. 002 (part 1 oF 2) 10.0 points The wind exerts a Force oF 290 N North on a sailboat, while the water exerts a Force oF 129 N West on the sailboat. What is the magnitude oF the net external Force on the sailboat? Correct answer: 317 . 397 N. Explanation: Let : F x = F water = 129 N and F y = F wind = 290 N . 290 N 129 N v Scale: 100 m θ Thus F net = r F 2 x + F 2 y = r ( 129 N) 2 + (290 N) 2 = 317 . 397 N . 003 (part 2 oF 2) 10.0 points How many degrees west oF north is this net external Force directed? Correct answer: 23 . 9808 . Explanation: tan θ = F x F y θ = tan 1 p F x F y P = tan 1 p 129 N 290 N P = 23 . 9808 , which is 23 . 9808 to the west oF north. keywords:

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reddy (ar38357) – Tension and inclined planes – clancy – (SCI411-2) 2 004 10.0 points Two men decide to use their cars to pull a truck stuck in mud. They attach ropes and one pulls with a force of 982 N at an angle of 30 with respect to the direction in which the truck is headed, while the other car pulls
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solution_pdf11 - reddy(ar38357 Tension and inclined planes...

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