11. Box A (mass 50 kg) and box B (mass 200 kg) shown in Figure 9 are released from rest. Here the mass of pulleys is ignored. The coefficient of copper friction between box A and box B is 0.1, the coefficient of copper friction between box B and slope is 0.2, and the angle of slope is 20 degrees. Answer each of the following questions. 1) Calculate the acceleration (m/s^2) of box A. 2) Find the tension size (lb).
11. Box A (mass 50 kg) and box B (mass 200 kg) shown in Figure 9 are released from rest. Here the mass of pulleys is ignored. The coefficient of copper friction between box A and box B is 0.1, the coefficient of copper friction between box B and slope is 0.2, and the angle of slope is 20 degrees. Answer each of the following questions.
1) Calculate the acceleration (m/s^2) of box A.
2) Find the tension size (lb).
3) If box A and box B are obtained when box B moves 1.0m, explain why it is not possible to apply the Principle of Work & Energy to the entire box A, box B and pulley system, and obtain the speed (m/s) of box A and box B when box B moves 1.0m down.
4) When box B moves 2m, calculate the speed (m/s) of box A using the Modified energy supply law.
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