Question

The resultant of the system in the figure is a force of $8 N$ parallel to the given force through $R$. The value of equals to

• A. $1 / 4 R Q$
• B. $3 / 8 R Q$
• C. $3 / 5 R Q$
• D.

Answer 1

Answer: (C)

$3 / 5 R Q$

Answer 2

By taking moment of forces about point R,

$5 \times P R - 3 \times R Q = 0$⇒ $P R = \frac { 3 } { 5 } R Q$.