If a system is in equilibrium and the position of the system depends upon many independent variables, the principle of virtual work states that the partial derivatives of its total potential energy with respect to eaeh of the independent variable must be (Mechnical Engg.)

If a system is in equilibrium and the position of the system depends u

1.	If a system is in equilibrium and the position of the system depends upon many independent variables, the principle of virtual work states that the partial derivatives of its total potential energy with respect to eaeh of the independent variable must be (Mechnical Engg.)
A.	-1.0
B.	Zero
C.	1.0
D.	Infinite
Answer» C. 1.0