1.
The resultant of two equal forces P making an angle $$\theta ,$$ is given by

3.
If a number of forces are acting at a point, their resultant is given by

4.
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of $$\alpha $$ rad/s2, is

5.
Moment of inertia of a circular section about an axis perpendicular to the section is

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