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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege

Engineering 36. Problem 7.2.47 Arm Curls. Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu. Prob 7.2.47. The Arm FBD. F elb. F muscle. y. θ. Pt-E. x. ForeArm. α. The Angle α is the angle for the ForeArm Relative to the Horizontal

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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege

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  1. Engineering 36 Problem7.2.47 Arm Curls Bruce Mayer, PE Licensed Electrical & Mechanical EngineerBMayer@ChabotCollege.edu

  2. Prob 7.2.47

  3. The Arm FBD Felb Fmuscle y θ Pt-E x ForeArm α • The Angle α is the angle for the ForeArm Relative to the Horizontal • The Angle θ is the angle between the ForeArm and the UpperArm W

  4. 7.2.47 FBD analysis • Note from the FBD that θ does NOT affect Moments about the elbow hinge Pt-E. • The ONLY angle that affects the moment is the ForeArm angle relative to the horizontal • Taking the sum of the moments about Pt-E using ONLY • Divide both sides by cosα

  5. 7.2.47 FBD analysis • Now Find Simply that • Thus the force Required to Lift the Weight is NOT a function of the UpperArm to ForeArm Angle

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