Ql:- The system of gears B and C take out power 150 and 175 hp respectively from a motor A that has 325hp, Find the shaft dimeter if the allowable shear stress is 6250 psi and the angle of twist between gear C and motor is 2 degree. Let G=11.5 x 106 psi. Gear Gear Motor C

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.