Physics, 18.01.2020 05:31 drecooks713
Consider your moment of inertia about a vertical axis through the center of your body, both when you are standing straight up with your arms flat against your sides, and when you are standing straight up holding your arms straight out to your sides. estimate the ratio of the moment of inertia with your arms straight out to the moment of inertia with your arms flat against your sides. (assume that the mass of an average adult male is about 80 kg, and that we can model his body when he is standing straight up with his arms at his sides as a cylinder. from experience in men's clothing stores, a man's average waist circumference seems to be about 34 inches, and the average chest circumference about 42 inches, from which an average circumference can be calculated. we'll also assume that about 20% of your body's mass is in your two arms, and that each has a length l = 1 m, so that each arm has a mass of about m = 8 kg.)
Answers: 2
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