Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 11 - Rotational Dynamics and Static Equilibrium - Problems and Conceptual Exercises - Page 373: 102

Answer

$ \vec{F_2}=(0.59KN/m)\hat x+(1.4KN)\hat y$ $ \vec{F_1}=(-0.59KN/m)\hat x+0.33KN\hat y$

Work Step by Step

We know that $\vec{F_2}=(\frac{m_pg}{d})x+\frac{m_bgL}{2d}$ We plug in the known values to obtain: $\vec{F_2}=\frac{(90.0Kg)(9.8m/s^2)}{1.50m}+\frac{(85Kg)(9.81m/s^2)(5.00m)}{2(1.50m)}$ $\implies \vec{F_2}=588.6x+1389.75$ $\implies \vec{F_2}=(0.59KN/m)\hat x+(1.4KN)\hat y$ Now $\vec{F_1}=(m_b+m_p)g-F_2$ We plug in the known values to obtain: $\vec{F_1}=(85Kg+90.0Kg)(9.81m/s^2)-(588.6x+1389.75N)$ $\implies \vec{F_1}=1716.75-588.6x-1389.75$ $\implies \vec{F_1}=(-0.59KN/m)\hat x+0.33KN\hat y$
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