statics

Question: Three forces P, Q, R act along the sides BC, CA, AB of a $\Delta ABC$ taken in order, if their resultant passes through the centroid of $\Delta ABC,$ then

1) $P+Q+R=0$

2) $\frac{P}{a}+\frac{Q}{b}+\frac{R}{c}=0$

3) $\frac{P}{\cos A}+\frac{Q}{\cos B}+\frac{R}{\cos C}=0$

4) None of these

Solution:

Explanation: No Explanation

Parallel forces Moment and Couples

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