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Find the magnitude of the angular acceleration produced given the mass lifted is 13.5 kg at a distance of 28.0 cm from the knee join, the moment of inertia of the lower leg is 0.900 kg*m2, the muscle force is 1470 N and its effective perpendicular lever arm is 3.40 cm. How much is work is done if the leg rotates through an angle 15 degrees with a constant force exerted by the muscle?

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