Compute the moment of the 8 lb force P about the y axis No

Compute the moment of the 8 - lb force P about the y - axis. Note that the force P and the normal n to the face of the door lie in a vertical plane.

Solution

Force P can be resolved into normal (Pcos30) and tangential (Psin30) components.

Moment due to normal component = Pcos30*40 = 277.13 lb-in

Moment due to tangential component = Psin30*40 = 160 lb-in