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Unformatted text preview: tokarski (at23678) – motion in one direction – Morozova – (11104) 1 This printout should have 12 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A person travels by car from one city to an other. She drives for 32 . 4 min at 74 km / h, 10 . 8 min at 85 . 3 km / h, 53 . 8 min at 43 . 6 km / h, and spends 19 . 2 min along the way eating lunch and buying gas. Determine the distance between the cities along this route. Correct answer: 94 . 4087 km. Explanation: Distances traveled are x 1 = v 1 t 1 x 2 = v 2 t 2 x 3 = v 3 t 3 Then the total distance traveled is x = x 1 + x 2 + x 3 = (39 . 96 km) + (15 . 354 km) + (39 . 0947 km) = 94 . 4087 km . 002 (part 2 of 2) 10.0 points Determine the average speed for the trip. Correct answer: 48 . 748 km / h. Explanation: And, time spent is t = t 1 + t 2 + t 3 + t other = (32 . 4 min) + (10 . 8 min) + (53 . 8 min) + (19 . 2 min) = 1 . 93667 h . Hence v av = x t = 94 . 4087 km 1 . 93667 h = 48 . 748 km / h . 003 (part 1 of 2) 10.0 points An electron in the cathode ray tube of a tele vision set enters a region where it acceler ates uniformly from a speed of 38100 m / s to a speed of 3 . 99 × 10 6 m / s in a distance of 3 . 55 cm. What is its acceleration? Correct answer: 2 . 24206 × 10 14 m / s 2 . Explanation: Basic Concepts: Constant acceleration The kinematics equations v f = v o + at v 2 f = v 2 o + 2 as Solution: Taking the direction of motion to be along the x axis, the second equation yields a = v 2 f v 2 o 2 x = ( 3 . 99 × 10 6 m / s ) 2 (38100 m...
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This document was uploaded on 06/01/2009.
 Spring '08

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