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Using the connectivity of the elements, the internal virtual work can be expressed in the form _____

a) ΨT=KQ
b) ΨT=K
c) KQ=F
d) σ=Dε

Answer: a
Explanation: The principle of virtual work states that in equilibrium the virtual work of the forces applied to a system is zero. Newton’s laws state that at equilibrium the applied forces are equal and opposite of the reaction, or constraint forces.

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