Strength of Materials
D Alembert’s principle is used for

designing safe structures
stability of floating bodies
determining stresses in the truss
reducing the problem of kinetics to equivalent statics problem

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

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

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