# CW7 - 8 m s 2 How much work did the escalator do on Karen...

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boland (kbb544) – CW7 – mackie – (10611) 1 This print-out should have 1 question. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Karen has a mass oF 51 . 1 kg as she rides the up escalator at Woodley Park Station oF the Washington D.C. Metro. Karen rode a distance oF 59 . 9 m, the longest escalator in the Free world. The acceleration oF gravity is 9
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Unformatted text preview: . 8 m / s 2 . How much work did the escalator do on Karen iF it has an inclination oF 32 . 7 ◦ ? Correct answer: 16205 . 4 J. Explanation: d h θ The escalator raised Karen a height oF h = d sin θ so the work done on Karen by the escalator is W = mgh = mgd sin θ = (51 . 1 kg) (9 . 8 m / s 2 ) (59 . 9 m) sin32 . 7 ◦ = 16205 . 4 J...
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