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Q. The leg and cast weigh 250 N, with the center of mass as indicated by the blue arrow. The counterbalance w2 weighs 115 N. Determine the weight w1 and the angle α needed in order that there be no force exerted on the hip joint by the leg plus cast.

Q. You're carrying a 3.2-m-long, 25 pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip. How much force must you exert to keep the pole motionless in a horizontal position?

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