A window washer pushes his scrub brush up a vertical window at constant speed by applying a force as shown in the figure . The brush weighs 12.5 N,...

A window washer pushes his scrub brush up a vertical window at constant speed by applying a force as shown in the figure . The brush weighs 12.5 N, theta=52.5 degree and the coefficient of kinetic friction is 0.151.Calculate the magnitude of the force .Calculate the magnitude of the normal force exerted by the window on the brush.