Consider $($Figure $1).$ Block A

weighs $50$ lb

and the platform weighs $12$ lb

$.$

Figure$1$ of $1$

Block $\text{'}$A$\text{'}$ is lying on the center of platform B$.$ The platform is supported at its ends by a cord. From the left end of the platform, the cord goes upward, over a smaller pulley, under a bigger free pulley, over another smaller pulley, and downward to the right end of the platform. The smaller pulleys are fixed on the same horizontal level to the vertexes of a triangular frame. The third vertex of the frame is directly above the block and is pulled upward by force P$.$ The axle of the free pulley is connected to block $\text{'}$A$\text{'}$ below it$.$

Part A

If P

$=150$ lb

$,$ determine the normal force exerted by block A

on B

$.$ Neglect the weight of the pulleys and bars of the triangular frame.

Express your answer in pounds to three significant figures.

Activate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

N

$=$

lb

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