Answer
(a) please refer to the free-body diagram
(b) The normal force that the floor exerts on the chair is 142 N.
Work Step by Step
(a) please refer to the free-body diagram
(b) $F_N = F~sin(\theta)+ mg$
$F_N = (40.0~N)~sin(37.0^{\circ})+(12.0~kg)(9.80~m/s^2)$
$F_N = 142~N$
The normal force that the floor exerts on the chair is 142 N.
