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cw2 - patel(kp9583 CW2 Mackie(20211 This print-out should...

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patel (kp9583) – CW2 – 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. DEADLINE IS CENTRAL TIME!! 001 (part 1 of 2) 10.0 points A Cessna aircraft has a lift-off speed of 106 km / h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 200 m? Correct answer: 2 . 16744 m / s 2 . Explanation: Given : v i = 0 , v = 106 km / h , and x = 200 m . Under constant acceleration, v 2 f = v 2 i + 2 ax = 2 ax since v i = 0 mi/h, so a = v 2 f 2 x = (106 km / h) 2 2(200 m) parenleftbigg 0 . 278 m / s 1 km / h parenrightbigg 2 = 2 . 16744 m / s 2 . 002 (part 2 of 2) 10.0 points How long does it take the aircraft to become airborne? Correct answer: 13 . 5849 s. Explanation: Under constant acceleration, v f = v i + at = at since v i = 0, so t = v f a = 106 km / h 2 . 16744 m / s 2 parenleftbigg 0 . 278 m / s 1 km / h parenrightbigg = 13 . 5849 s . 003 10.0 points A car traveling in a straight line has a velocity of 5 . 39 m / s at some instant. After 7 . 27 s, its velocity is 13 . 7 m / s.

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