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2. A brake consists of members AB, CB and pulley D as shown in figure. A string supporting
a weight P-1800N passes through over pulley D. the other end of the string is secured to the
wall. r=0. Im. AD=0.2m, BD=0.4m,
.Determine the reaction forces at points A and the
internal force of rod BC. The weight of the members and pulley are negligible-
D
B

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