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Force and Angle

18. the leg and cast in picture (attached) weigh 220N (w1)
Determine the weight w2 and the angle needed so that no force is exerted on the hip joint by the leg plus the cast.

41. The coefficient of static friction between a 3.00 kg crate and the 35.0 degree incline it sits on is 0.300. What minimum force (F) must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?

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