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qz4sol_3891f10

# qz4sol_3891f10 - block B Newton’s 2 nd law yields A& C...

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TA: Tomoyuki Nakayama Tuesday, September 28, 2010 PHY 2048: Physic 1, Discussion Section 3891 Quiz 4 (Homework Set #5) Name: UFID: Formula sheets are not allowed. Calculators are allowed. Do not store equations in your calculator. You need to show all of your work for full credit. ________________________________________________________________________________ In the figure below right, blocks A and B have weights of 60.0 N and 40.0 N, respectively. a) Determine the minimum weight of block C to keep A from sliding if μ s between A and the table is 0.300. We take our +x axis to the right and +y axis upward for the blocks A and C and positive direction downward for
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Unformatted text preview: block B. Newton’s 2 nd law yields A & C x : 0 = T – f A & C y : 0 = N – W A – W C B: 0 = W B – T ⇒ W B = f If the minimum weight of block C is on A, the blocks A and C are on the verge of sliding. Thus we have f = f s, max = μ N = μ (W A + W C ) W B = μ (W A + W C ) W C = W B / μ- W A = 73.3 N b) Block C suddenly is lifted off A . What is the acceleration of block A if μ k between A and the table is 0.150? In our coordinate system, a A = a B = a. Newton’s 2 nd law yields A x : m A a = T – f A y : 0 = N – W A B: m B a = W B – T (m A + m B )a = W B- μ k (W A ) a= (W B- μ k W A )g/( W B + W A ) = 3.04 m/s 2...
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