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Unformatted text preview: patel (kp9583) CW2 Mackie (20211) 1 This printout should have 5 questions. Multiplechoice 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 liftoff speed of 106 km / h. What minimum constant acceleration does this require if the aircraft is to be airborne after a takeoff 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 a x = 2 a x since v i = 0 mi/h, so a = v 2 f 2 x = (106 km / h) 2 2(200 m) parenleftbigg . 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 + a t = a t since v i = 0, so t = v f a = 106 km / h 2 . 16744 m / s 2 parenleftbigg . 278 m / s 1 km / h parenrightbigg...
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 Fall '09
 MIHALISIN
 Physics

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