A string of negligible mass passes over a pulley of mass m which is clamped. It supports a block of mass M at its lower free end. What is force exerted on pulley by the support ?

A string of negligible mass passes over a pulley of mass m which is cl

1.	A string of negligible mass passes over a pulley of mass m which is clamped. It supports a block of mass M at its lower free end. What is force exerted on pulley by the support ?
Answer» Solution :There are TWO forces acting on SUPPORT, (i) T, the tension due to horizontal PART of STRING, where T = Mg (ii) (M + m)g, TOTAL weight of pulley and block along vertical. `F=sqrt((Mg)^(2)+[(M+m)g]^(2))` `= (sqrt((M+m)^(2)+M^(2)))g`