37° FIGURE P5.64 (c5p64) Two blocks, A and B (with mass 42.0 kg and 84.0 kg, res

Question

37° FIGURE P5.64 (c5p64) Two blocks, A and B (with mass 42.0 kg and 84.0 kg, respectively), are connected by a string, as shown in Figure P5.64. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is ' O 12 Determine the change in the kinetic ene gy of the sem as blo k A moves from C to a distance t 220 m up the incline if the system starts from rest. (in J) A: 1268.87 B: 1839.86 C: 2667.80D: 3868.31E: 5609.05 OF: 8133.13 G: 11793.03H: 17099.90 Suomit Anawer Tries o/3

Explanation / Answer

L = 22 m

h = L sin37 = 13.2 m

perpendicular to the incline,

N = m g cos37

and f = uk N = 0.120 x 42 x 9.81 x cos37 = 39.5 N

Change in KE = Net work

=work done by gravity + work done by friction

= (84 x 9.81 x 22) - (42 x 9.81 x 13.2) - (39.5 x 22)

= 11800 N

Ans(G)

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