# HW21 - Thevalingam Donald – Homework 21 – Due Mar 4...

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Unformatted text preview: Thevalingam, Donald – Homework 21 – Due: Mar 4 2007, midnight – Inst: Eslami 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points A 36 kg child on a 2 . 3 m long swing is released from rest when the swing supports make an angle of 25 ◦ with the vertical. The acceleration of gravity is 9 . 8 m / s 2 . If the speed of the child at the lowest po- sition is 1 . 83818 m / s, what is the mechani- cal energy dissipated by the various resistive forces ( e.g. friction, etc.)? Answer in units of J. 002 (part 1 of 3) 10 points The coefficient of friction between the 6 . 1 kg mass and the table is 0 . 55, and the coefficient offrictionbetweenthe5kg massandthetable is 0 . 3. Consider the motion of the 39 kg mass which descends by the amount of Δ y = 0 . 3 m after releasing the system from rest....
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HW21 - Thevalingam Donald – Homework 21 – Due Mar 4...

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