mid1v1sol - Ph 111.01 September 29, 2008 Midterm 1, Ph 111...

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Ph 111.01 September 29, 2008 Midterm 1, Ph 111 0 5 10 15 20 0 4 8 12 16 20 24 28 32 36 40 score (out of 40) average = 27/40 125 people C, D B A SEAT NUMBER NAME Midterm I Please answer all of the problems, showing your work and explaining your reasoning. You may refer to your formula sheet, one page (both sides). Please express all numerical answers to at least three significant figures, and give the corresponding units (m, N, s, m/s 2 , etc). Please take the acceleration of gravity to be exactly g = 9.8 m/s 2 .
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Problem 1. You start out on a trip by driving in a straight line at a constant speed of 12 m/s for 10 seconds. You are driving along the x axis, in the positive direction. (a ) What is your average velocity for this part of the trip? v av = 12 m/s (b) What is your displacement during this part of the trip? 12 m/s * 10 sec = 120 m Δ x =120 m Next you start to speed up, accelerating at a constant rate of 6 m/s 2 for the next 3 seconds. (c) What is your final velocity? ( ) ( )( ) 2 0 12 m/s + 6 m/s 3 s 30 m/s vv a t =+= = v =30 m/s (d) What is your displacement during this part of the trip? We think of starting at t = 0 with x 0 = 0, v 0 = 12 m/s, a = 6 m/s 2 , and calculating x at t = 3 sec. () ( ) 2 1 00 2 2 2 1 2 0 12 m/s 3 s 6 m/s 3 s 63 m xx v t a t =+ + + = (e) What is your average velocity for the entire trip?
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This note was uploaded on 05/13/2010 for the course PHYSICS 111 taught by Professor Staff during the Fall '08 term at S.F. State.

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mid1v1sol - Ph 111.01 September 29, 2008 Midterm 1, Ph 111...

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