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TOMIHIRO ONO. Created for Albert.io. Copyright 2016. All rights reserved.

A man pulls on a cord attached to a heavy $200 N$ block. The coefficient of static friction between the box and the floor is $\mu = 0.5$.

If the cord makes an angle of $\theta = 30.0^o$ with the floor, what normal force $F_N$ will the floor be exerting on the block when the man is exerting enough force so that the box is barely about to move?

A

$78 N$

B

$100 N$

C

$142 N$

D

$155 N$

E

$189 N$

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