5a - moving m 1 m 2 Solution Mass 1 T f = 0 since a = 0...

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PHY2053 – Section 7392 Quiz #5 Friday, February 13, 2004 Name____________ KEY ______________ UFID___________________ Please read the problem carefully and be sure to show all of your work. Partial credit will be given. An object with a mass m 1 = 30.0 kg, resting on a frictionless horizontal table, is connect to a cable that passes over a frictionless pulley and then fastened to a hanging object with a mass of m 2 = 10.0 kg. What is the value of coefficient of kinetic friction ( µ k ) between m 1 and the table that will keep the masses at constant velocity assuming they are already
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Unformatted text preview: moving? m 1 m 2 Solution: Mass 1: T - f = 0 since a = 0 Also, f = µ k m 1 g Combining these gives: T = k m 1 g Mass 2: m 2 g - T = since a = 0 Substituting T = k m 1 g into the equation for mass 2 gives m 2 g - k m 1 g = Solving for k : k = 1 2 m m = 0.33 Note on the hazards of ‘cut and paste’: The problem explicitly (and incorrectly) stated that the table was frictionless, so I also accepted the answer k = 0....
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