[SOLVED] correct me if i'm wrong plz just a couple of problems i want to make sure i did correctly. 1) A force of 4.0 N is applied to a door at an angle of 60 degrees and a distance of .30 m from the hinge. What is the torque produced? T=F*d*sin theta --> 1.04 Nm 2) A child with a weight of 4.5 x 10^2 N sits on a seesaw .60 m from the axis of rotation. How far from the axis of rotation on the other side should a child with a weight of 6.00 x 10^2 N sit so the seesaw will remain balanced? m1gd1=m2gd2 --> .45 m 3) What work is required to lift a 500 kg mass a distance of 9 meters using a machine that is 65% efficient? Efficiency=output/input --> .65= 4900(9)/input --> 6.78 x 10^4 J i think these were simple but i'm just double checking. thanks guys.