Question

A body of mass `m` is kept on a rough fixed inclined plane of angle of inclination `theta=30^(@)`. It remains stationary. Then magnitude of force acting on the body by the inclined plane is equal to `:`
A. `mg`
B. `mg sin theta`
C. `mg cos theta`
D. none of these

Answer 1

Correct Answer - A
`N=mgcos theta, f_(s)=mg sin theta`
`R^(2)=N^(2)+f_(s)^(2)`
`rArrR=mg ` `(A)`.