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Sahay Sir > Question Answers > Arihant Physics by D.C Pandey > Volume 1 > Chapter 5 - Laws of Motion > The upper portion of an inclined plane of inclination a is smooth and the lower portion is rough. A particle slide down from rest the top and just comes to rest at the foot . If the ratio of smooth length to rough length is m:n, find the coefficient of friction .

The upper portion of an inclined plane of inclination a is smooth and the lower portion is rough. A particle slide down from rest the top and just comes to rest at the foot . If the ratio of smooth length to rough length is m:n, find the coefficient of friction .

A mass M is suspended by a rope from a rigid support at A as shown in figure. Another rope is tied at the end B and it is pulled horizontally with a force. If the rope AB makes an angle θ with the vertical in equilibrium then the tension in the string AB is