Assignment 2 Solutions

# Assignment 2 Solutions - 1 Block A weights 356N and block B...

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1. Block A weights 356N and block B weights 71N. The coefficients of friction between all surfaces of contact are μ s = 0.20 and μ k = 0.15. Knowing that P = 44.5 N →, determine (a) the acceleration of block B, (b) the tension in the cord. (B.,J.&C. 12.17)

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Problem 12.17 =-17.5N<44.5N P=44.5N Calculate acceleration of A =0.202 =0.202*9.81=1.98 =0.202*9.81=1.98 m/ s^2 =54 N
2. To transport a series of bundles of shingles A to a roof, a contractor uses a motor -driven lift consisting of a horizontal platform BC which rides on rails attached to the sides of a ladder. The lift starts from rest and initially moves with a constant acceleration a 1 as shown. The lift then decelerates at a constant rate a 2 and comes to rest at D , near the top of the ladder. Knowing that the coefficient of static friction between the bundle of shingles and the horizontal platform is 0.30, determine the largest allowable acceleration a 1 and the largest allowable deceleration a 2 if the bundle is not to slide on the platform. (B., J. & C. 12.24)

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3. The coefficients of friction between the three blocks and the
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Assignment 2 Solutions - 1 Block A weights 356N and block B...

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