71. The algebraic sum of moments of the forces forming couple about any point in their plane is
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72. A single force and a couple acting in the same plane upon a rigid body
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73. If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either
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74. The maximum frictional force which comes into play when a body just begins to slide over another surface is called
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75. The necessary condition for forces to be in equilibrium is that these should be
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76. If three forces acting in different planes can be represented by a triangle, these will be in
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77. If n = number of members and j = number of joints, then for a perfect frame, n =
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