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CW13-solutions

# CW13-solutions - kuehner(rjk679 CW13 Mackie(20211 This...

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kuehner (rjk679) – CW13 – Mackie – (20211) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A roller coaster cart oF mass m = 333 kg starts stationary at point A, where h 1 = 30 . 8 m and a while later is at B , where h 2 = 11 . 6 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 e±ect oF Friction? Correct answer: 19 . 399 m / s. Explanation: By conservation oF energy Δ U + Δ K = 0 ( mg h 2 - 1 ) + 1 2 mv 2 = 0 mg ( h 1 - h 2 ) = 1 2 2 Solving For v , v = r 2 g ( h 1 - h 2 ) = R 2 (9 . 8 m / s 2 ) (30 . 8 m - 11 . 6 m) = 19 . 399 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 fgure below). It leaves the track horizontally, ²ies through the air, and subsequently strikes the ground. The acceleration oF gravity is 9 . 8 m / s 2 .

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CW13-solutions - kuehner(rjk679 CW13 Mackie(20211 This...

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