Q. A body of mass $10\ kg$ is lying on a rough plane inclined at an angle of $30{^\circ}$ to the horizontal and the coefficient of friction is 0.5. the minimum force required to pull the body up the plane is
A) $914\ N$
B) $91.4\ N$
C) $9.14\ N$
D) $0.914\ N$
Explanation
(b) $F = mg\ \left( \sin\theta + \mu\cos\theta \right)$
$= 10 \times 9.8\left( \sin{30{^\circ}} + 0.5\cos{30{^\circ}} \right) = 91.4\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.