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Part C If one rotation takes 1.7 s when the person's arms are outstretched, what is the time for each rotation with arms at the sides? Ignore the moment of inertia of the lightweight platform. Express your answer using two significant figures. T = Submit Part D ΔΚ - 15. ΑΣΦΑΛ Determine the change in kinetic energy when the arms are lifted from the sides to the horizontal position. Express your answer using two significant figures. 15. ΑΣΦ Submit Part E Request Answer Submit Request Answer It is easier to lift the arms when at rest. It is easier to lift the arms when rotating. Provide Feedback From your answer to part D, would you expect it to be harder or easier to lift your arms when rotating or when at rest? Express your answer using two significant figures. ? DING Request Answer ?
A 70-kg person stands on a tiny rotating platform with arms outstretched. Part A Estimate the moment of inertia of the person using the following approximations: the body (including head and legs) is a 56- kg cylinder, 13 cm in radius and 1.8 m high; and each arm is a 7.0-kg thin rod, 61 cm long, attached to the cylinder. Express your answer using two significant figures. I = 3.6 kg. m² Correct Correct answer is shown. Your answer 3.56 kg - m² was either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. Part B Previous Answers Using the same approximations, estimate the moment of inertia when the arms are at the person's sides. Express your answer using two significant figures. I = 0.71 kg-m² Part C Previous Answers Correct Important: If you use this answer in later parts, use the full unrounded value in your calculations. If one rotation takes 1.7 s when the person's arms are outstretched, what is the time for each rotation with arms at the sides?