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problem11_68

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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11.68: (a) N 2 . 59 ) cm 0 . 15 )( N 0 . 15 ( ) cm 80 . 3 ( 0 B B Elbow = = = τ Σ F F (b) N 754 3 )( N 0 . 80 ( ) cm 0 . 15 )( N 0 . 15 ( ) cm 80 . 3 ( 0 B B = + = = τ Σ F F E

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The biceps force has a short lever arm, so it must be large to balance the torques. (c) N 659 N 0 . 80 N 15.0 N 754 0 N 80.0 N 0 . 15 : 0 E B E = - - = = - - + - = Σ F F F F (d) The biceps muscle acts perpendicular to the forearm, so its lever arm stays the
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problem11_68 - 11.68(a Elbow 0(15.0 N(15.0 cm 59.2 N...

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