I have a problem with which I need help. The question is:
A jet aircraft is climbing at an angle of 45° above the horizontal and is accelerating at 4.5m/s2. What is the total force that the cockpit seat exerts on the 75kg pilot?
It says that the y-component of the force is:
$$F\sin(a)–mg\cos(45^\circ) = 0.$$
I don't understand how this component is working at all. I was just wondering if anybody could help me understand why this is the y-component of the force exerted by the seat.