A block is placed on a rough inclined plane of inclination theta = 30^(@). If the force to drag it along the plane is to be smaller than to lift it. The coefficient of friction mu should be less than

A block is placed on a rough inclined plane of inclination theta = 30^

1.	A block is placed on a rough inclined plane of inclination theta = 30^(@). If the force to drag it along the plane is to be smaller than to lift it. The coefficient of friction mu should be less than
Answer» Solution :`MG(sin theta + MU cos theta)lt mg` `sin 30^(@)+mu cos 30^(@)lt 1` `(1)/(2)+mu(sqrt(3))/(2)lt 1` `RARR mu (sqrt(3))/(2)lt 1//2 rArr mu lt (1)/(sqrt(3))`