First slide
Constraints
Question

In the following figure, the pulley P1 is fixed and the pulley P2 is movable. lf W1 = W2 = 100 N, what is the angle AP2P1? The pulleys are frictionless.

Moderate
Solution

 

2W cos θ = W2

= 2 x 100 cos θ = 100
 cos θ = 12   θ = 600 = 2θ = 1200

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