question_answer

A uniform plank of Youngs modulus Y is moved over a smooth horizontal surface by a constant horizontal force F. The area of cross-section of the plank is A. The compressive strain on the plank in the direction of the force is:

A)  \[\frac{F}{AY}\]                                               

B)  \[\frac{2F}{AY}\]            

C)  \[\frac{1}{2}\frac{F}{AY}\]          

D)         \[\frac{3F}{AY}\]

E)  \[\frac{F}{3AY}\]