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# s3a10 - Solutions Homework 3a09 Physics E-1a Fall 2010 MC 1...

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Physics E-1a Solutions Homework 3a09 Fall 2010 MC 1 A nswer b) is False). From Newton's third law for every action there is an equal and opposite action. Pulling on the handle causes a force to be applied to the block which and gives rise to a tension in the string. The tension in the string acts on the ball and the ball acts back on the string. MC 2 The answer is d) The acceleration along the plane depends only on the angle of the incline and the acceleration due to gravity (the value of g). MC 3 The answer is a). We refer to Newton’s second law: ma = F net . The problem statement indicates that force is constant. The graphs show acceleration as a function of mass, so we rearrange the equation to read m F a net = . This is an inverse relationship, as shown in graph (a). Note that (c) is not correct: for greater masses than those shown, the acceleration would become negative. MC 4 The answer is d) the angle depends on the coefficient of friction F x = F fr or mg sin ! = μ F N with F N = mg cos ! gives mg sin ! = μ mg cos ! then μ = tan ! 30. Find the net force on the elevator; and from it determine the acceleration. Then use Eq. (4-5) to find the speed . Find the net force on the elevator .

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