5/26/16, 12:58 PMhomework #1given by Hooke's law:.What is ?Express your answer in terms of andHint 1.Relation between displacement and rotation angleConsider an object at a distancefrom the pivot it is rotating about. If it rotates through an angle, thenits displacementis given by.F=−kδδlθrϕ∆x∆x=rϕ.2
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CorrectHint 2.Find the moment armThe torqueabout a point is defined as the product of the forceacting on a body times the moment arm(perpendicular distancefrom the line of action of the force to the center point):What isfor the given situation?
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Express your answer in terms of quantities given in the problem introduction.2l4
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