For the following questions answer them individually
A body of weight 30 N rests on a horizontal floor. A gradually increasing horizontal force is applied to the body which just starts moving when the force is 9 N. The coefficient of friction between the body and the floor will be
A body of weight W is placed on a rough inclined plane. The inclination of‘the plane with the horizontal is less than the angle of friction. The body will
A device used to increase the temperature of saturated steam withoutraising its pressureis called