A block of face area A and height h is acted upon by a force F(tangential). Find the lateral shift of top surface it modulus of rigidity is \(\eta \).
(1) \(\frac{Ah}{F\eta}\)
(2) \(\frac{Fh}{A\eta}\)
(3) \(\frac{F\eta}{Ah}\)
(4) \(\frac12\frac{Fh}{A\eta}\)
