Question $1$

A $4\mathrm{.}00-$kg block rests between the floor and a $3\mathrm{.}00-$kg block as shown in the figure. The $3\mathrm{.}00-kg$ block is tied to a wall by a horizontal rope. If the coefficient of static friction is $0\mathrm{.}800$ between each pair of surfaces in contact, what horizontal force $F$ must be applied to the $4\mathrm{.}00-kg$ block to make it move? $)=(9\mathrm{.}8\frac{m}{s^2}$

Coefficient of static friction between the $4kg$ block and the floor is also $0\mathrm{.}800$