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AP® Physics C: Mechanics

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Moderate

Static Equilibrium for a Child on a Swing

APPHMC-40MOK1

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

Imagine you are pulling horizontally on a child on a swing as shown in the diagram. The child and the seat together weigh $100 N$. Take $\theta$ to be the angle the rope makes with the horizontal.

When $\theta = 30.0^o$, what is the necessary $F_A$ you need to apply to keep the child still?

A

50.0 N

B

57.7 N

C

86.6 N

D

173 N

E

200 N