Question

Two blocks, connected together by a thin but strong cord, are placed on a ramp as shown in the figure. The angle of the ramp is ?=30 degrees , the masses of the blocks are mA = 1.00kg and mB = 2.00kg, and the coefficient of static and kinetic friction between boxes and ramp are µs = 0.500 and µk = 0.200. The gravitational acceleration is 9.8m/s2 . The mass of the cord is negligible. The cord does not stretch and does not break.

a) Force F is applied to the upper block as shown in the figure. Draw free body diagrams for the two blocks.

b) Calculate the value of the constant force F necessary for the two blocks to start sliding up the ramp at constant speed.

c) Once the boxes are in motion up the ramp with constant speed, what is the tension in the cord?

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