Strength of Materials
If a number of forces act simultaneously on a particle, it is possible

To replace them by a single force
To replace them by a couple
Not a replace them by a single force
To replace them by a single force through C.G.

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point

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