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# Review1 - Physics 140 Fall 2007 midterm#1 review Bad logic...

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Physics 140 – Fall 2007 midterm #1 review Bad logic - 1. What equation do I use? Good logic - 1. What information do I know? 2. What information am I being asked to find? 3. What key ideas/conceptual tools should I apply? 4. What equations express these ideas? Suppose this lab is performed inside a car of a TGV moving at a constant speed of 220 km/hr along a curved track. What will be the outcome of the experiment? A physics lab to determine the acceleration of gravity involves measuring the time of flight of a small ball falling straight down a narrow vertical cylinder. 1) The ball will hit the side of the cylinder; the experiment won’t work. 2) The ball will drop straight down with acceleration 9.8 m/s 2 . 3) The ball will drop straight down with acceleration different from 9.8 m/s 2 . 4) None of the above.

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A train wheel of radius R with a black dot painted on its edge (point P) is rolling without slipping on a rail. Between times t 1 and t 2 the wheel turns through half a revolution. Over this time interval, the displacement vector of point P, expressed in unit vector notation, is 1. 2 R i + 2 R j 2. 2 ! R i + 2 R j 3. 2 R i + ! R j 4. ! R i + 2 R j 5. ! R i + R j j i The three vectors labeled a, b and c have magnitudes of 3, 4 and 10, respectively. Which of the following operations produces a result with the largest magnitude?
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