sample_problems_answer

sample_problems_answer - Sample Problems. 1. a = v vf - vi...

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Sample Problems. 1. a = Δ v Δ t = v f - v i 10s v f = 0 ,v i = 100km / h = 100 × 1000m 3600s = 27 . 78m / s a = - 27 . 78m / s 10s = - 2 . 778m / s 2 2. Free fall motion, a = g = 9 . 8m / s 2 i) a = Δ v Δ t = v f - v i 10s ,v f = a × 10s = 9 . 8m / s 2 × 10s = 98m / s ii) average velocity = displacement / time = d/t d = 1 2 at 2 = 1 2 × 9 . 8m / s 2 × (10s) 2 = 490 m d t = 490m 10s = 49m / s it will fall 490m . 3. a = 25m / s - 0m / s 10s = 2 . 5m / s 2 4. average speed = total distance total time t 1 = 600km 200km / h = 3 hr t 2 = 600km 300km / h = 2 hr totaltime = 3hr + 2hr = m 5hr averagespeed = 1200km 5hr = 240km / h 1
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5. Let the distance L t 1 = L 40km / h , t 2 = L 60km / h Totaltime = L 40km / h + L 60km / h = 100 L 2400km / h Averagespeed = 2 L 100 L 2400km / h = 2 × 2400km / h × L 100 × L = 48km / h 6. F = ma, 200N = 40kg × a, a = 5m / s 2 7. we have two force on it. One is 300N lifting fore, the other gravity(= mg = 20kg × 9 . 8m / s 2 ) thenet force = 300N - 196N = 104N = 20kg
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This note was uploaded on 04/29/2008 for the course PS 303 taught by Professor Modi during the Spring '08 term at University of Texas at Austin.

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sample_problems_answer - Sample Problems. 1. a = v vf - vi...

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