Answer
46 kg.
Work Step by Step
The magnitude of the torque she exerts is her weight multiplied by the distance between her feet and the left support post.
$$\tau = mgL$$
$$m=\frac{\tau}{gL}=\frac{1800 N \cdot m}{(9.8 m/s^2)(4.0m)}=46 kg$$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 9 - Static Equilibrium; Elasticity and Fracture - Problems - Page 252: 4
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