Exam1_solutions

Exam1_solutions - Physics 2101 First Exam Spring 2008...

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1. During a short interval of time the speed v in m / s of an automobile is given by v = at 2 + bt 3 , where the time t is in seconds. The units of the constants a and b are respectively: (a) m · s 2 ; m · s 4 (b) s 3 / m; s 4 / m (c) m / s 2 ; m / s 3 (d) m / s 3 ; m / s 4 (e) m / s 4 ; m / s 5 Since velocity needs to have units of m/s, each of the terms at 2 and bt 3 needs to also have units of m/s, with time in seconds. 2. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet? (a) 2.5 hrs (b) 2.0 hrs (c) 1.75 hrs (d) 1.5 hrs (e) 1.25 hrs The velocity of the cars with respect to one another is 100 km/h; they are 150 km apart, so they will meet in 1.5 hrs. 3. The plots below show the position versus time for the motion of ﬁve diﬀerent particles. Which particle is speeding up towards the origin of the x-axis?
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Exam1_solutions - Physics 2101 First Exam Spring 2008...

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