MCQOPTIONS
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| 1. |
According to the principle of virtual work, If the system of rigid bodies is in equilibrium under the action of a set of forces, then the work done by those forces during a small virtual displacement of the system must be equal to |
| A. | Infinite |
| B. | Zero |
| C. | Unity |
| D. | A non-zero constant |
| E. | always changing |
| Answer» C. Unity | |