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**[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.