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# cw17 - Determine the magnitude oF the angular momentum oF...

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patel (kp9583) – CW17 – Mackie – (20211) 1 This print-out should have 2 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A mother and daughter are on a seesaw in the park. How far from the center must the 119 lb mother sit in order to balance the 59 lb daugh- ter sitting 9 ft from the center? Correct answer: 4 . 46218 ft. Explanation: Let : F m = 119 lb , F d = 59 lb , and d d = 9 ft . F m d m = F d d d d m = F d d d F m = (59 lb) (9 ft) 119 lb = 4 . 46218 ft . 002 10.0 points The position vector of a particle of mass 2 kg is given as a function of time by vectorr = (5 m) ˆ ı + (6 m / s) t ˆ . Determine the magnitude of the angular
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Unformatted text preview: . Determine the magnitude oF the angular momentum oF the particle with respect to the origin at time 4 s . Correct answer: 60 kg m 2 / s. Explanation: Let : vr = x + y , x = 5 m , y = V y t = (6 m / s) t , and t = 4 s . Basic Concepts: v L = vr vp Solution: vV = vr t = V y = (6 m / s) . v L = vr vp = m vr vV = m vr vr t = m ( vx + vy ) vV = m x V y k = (2 kg) (5 m) (6 m / s) k = 60 kg m 2 / s k , and is constant as a Function oF time since = 0 ....
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