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Practice Midterm 1

# Practice Midterm 1 - Physics 1A-Spring 2009 Practice 1st...

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Physics 1A -Spring 2009 Practice 1st MIDTERM TEST - Thursday, April 16, 2009 This exam is closed book. One 3 inches × 5 inches card with formulas (two sides) is allowed. Write all units for all numerical results. For full credit on a claculation, always show your work to get your answer. The exam consists of a set of 4 short questions and 2 problems. Please do not open the exam until we do it all at the same time. You will have 50 minutes. Good luck! NAME: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - STUDENT I.D.: - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- SIGNATURE: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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First: a set of 4 short questions (20 points in total) (1.) (6 points) A car moves in the North direction at 50 km/h for one hour, then encounters heavy traffic and goes at 20 km/h for another 0.5 hours, before deciding to return and head back at 40 km/h in direction South for 0.5 hour. 1-a what is the average velocity of the car during the total time interval just described? 1-b what is the average speed of the car during the same time? 1-c what is the average acceleration of the car in the same time period?
(2) (4 points) A block of mass m

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Practice Midterm 1 - Physics 1A-Spring 2009 Practice 1st...

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