# cw13 - patel(kp9583 – CW13 – Mackie –(20211 1 This...

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Unformatted text preview: patel (kp9583) – CW13 – Mackie – (20211) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A roller coaster cart of mass m = 268 kg starts stationary at point A, where h 1 = 33 . 6 m and a while later is at B , where h 2 = 7 . 3 m. The acceleration of gravity is 9 . 8 m / s 2 . h h A B 1 2 What is the speed of the cart at B , ignoring the effect of friction? Correct answer: 22 . 7042 m / s. Explanation: By conservation of energy Δ U + Δ K = 0 ( mg h 2- mg h 1 ) + 1 2 mv 2 = 0 mg ( h 1- h 2 ) = 1 2 mv 2 Solving for v , v = radicalbig 2 g ( h 1- h 2 ) = radicalBig 2 (9 . 8 m / s 2 ) (33 . 6 m- 7 . 3 m) = 22 . 7042 m / s 002 (part 1 of 3) 10.0 points A block starts at rest and slides down a fric- tionless track except for a small rough area on a horizontal section of the track (as shown in the figure below)....
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cw13 - patel(kp9583 – CW13 – Mackie –(20211 1 This...

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