n of the 0.5-lb collar B is defined by the relations r= 10 + 6 cost and 0=(4-8), where r is expressed in inches, r in seconds, and 8 in radians. Determine the radial and transverse components of the force exerted on the collar when (a)1=0, (b) t=0.5

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A: As per guidelines we need to answer only first question so please repost rest questions separately.

Q: Determine the internal forces acting at point Q.

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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.