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Q: According to Bernoulli's virtual work principle, for a body be in equilibrium, the virtual work should be:
  • A. zero
  • B. minimum
  • C. maximum
  • D. any value between zero and one
Correct Answer: Option A - Virtual work principle states that when a body is in equilibrium then for a small change in displacement, the work done should be zero. • In this method the system is displaced through a small amount about a reference point and the work done by all the forces about the reference point is summed to zero, which is find out the unknown reaction if any.
A. Virtual work principle states that when a body is in equilibrium then for a small change in displacement, the work done should be zero. • In this method the system is displaced through a small amount about a reference point and the work done by all the forces about the reference point is summed to zero, which is find out the unknown reaction if any.

Explanations:

Virtual work principle states that when a body is in equilibrium then for a small change in displacement, the work done should be zero. • In this method the system is displaced through a small amount about a reference point and the work done by all the forces about the reference point is summed to zero, which is find out the unknown reaction if any.