Consider the system shown in the figure below. Block A weighs 48.4 N and block B

Question

Consider the system shown in the figure below. Block Aweighs 48.4 N and block B weighs20.8 N. Once block B is set intodownward motion, it descends at a constant speed.
(a) Calculate the coefficient of kineticfriction between block A and the tabletop.
1

(b) A cat, also of weight 48.4 N, fallsasleep on top of block A. If block B is now setinto downward motion, what is its acceleration?
magnitude 2 m/s2 direction 3---Select---upwarddownward (a) Calculate the coefficient of kineticfriction between block A and the tabletop.
1

(b) A cat, also of weight 48.4 N, fallsasleep on top of block A. If block B is now setinto downward motion, what is its acceleration?
magnitude 2 m/s2 direction 3---Select---upwarddownward magnitude 2 m/s2 direction 3---Select---upwarddownward

Explanation / Answer

a) let the tension be T in the string, let acceleratin be a,since a = 0, we have: 20.8N - T =0           (1) T-48.4N* =0          (2) (1)+(2) =>20.8N-48.4N = 0 => = 20.8N/48.4N = 0.429

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