The resultant of two equal forces P making an angle $$\theta ,$$ is given by

If a number of forces are acting at a point, their resultant is given by

The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of $$\alpha $$ rad/s2, is

Moment of inertia of a circular section about an axis perpendicular to the section is

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