The principle of virtual work can be applied to elastic system by considering the virtual work of_________________?
(A) internal forces only
(B) external forces only
(C) internal as well as external forces
(D) none of the above
The principle of virtual work can be applied to elastic system by considering the virtual work of_________________?
(A) internal forces only
(B) external forces only
(C) internal as well as external forces
(D) none of the above
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