S08Prelim1Solutions

# S08Prelim1Solutions - v wind = v 737 you never get back...

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P112 Prelim 1 Solutions Spring 2008 Part 1: Multiple Choice Questions: 1. speeding up, slowing down, slowing down, speeding up 2. B 3. F 4. Series, parallel, series 5. B, A, B and B, A, C 6. H 7. B 8. D 9. B and C 10. B 11. A 12. C Part 2: Problems 1. a) See vector diagram below. The angle θ at which the plane has to be pointed is given by sin = v wind /v 737 = 0.20. = 11.5 0 East of North . b) v ave < v 737 . On the return trip the vector diagram would be equivalent, thus v ave = v PG , both going and returning. v PG = v ave < v 737 . c) v ave < v 737 . The travel time is reduced by a rear wind, but increased more by a head wind. In case

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Unformatted text preview: v wind = v 737 , you never get back. 2. (a) (b) In the exam, 5.8 cm (unscaled) correspond to 40 cm on the scale; the scale factor is 40/5.8 = 6.9. a 2 Δ t 2 = 5.3 cm (unscaled). a 2 = 5.3 x 6.9 cm /0.040s 2 = 913 cm/s 2 3. (a) Third Law pairs f BonA & f AonB , N BonA & N AonB (b) x-direction: F - f BonA = m A a A y-direction: N BonA – W EonA = (c) N BonA = W EonA = m A g = 9.8 N f BonA = μ K N BonA K = f BonA / N BonA = (F – m A a A )/ N BonA = (5.0 N – 0.5 N)/9.8 N = 0.46...
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S08Prelim1Solutions - v wind = v 737 you never get back...

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