physics 121 exam 1 solutions

# physics 121 exam 1 solutions - Name last first Student ID...

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Name ___________________________________ Student ID Number ____________ last first Physics 121A, Summer 2010 Exam 1, page 1 I. The figure shows velocity versus time for an object (car) moving along a straight track. The initial position of the object at time t = 0 is known to be x 0 = +0 . 5 m, and its initial velocity is v 0 = -1 . 5 m/s. 1. (5 pts) Which graph best represents the position versus time for this motion? A. B. C. D. E. t (s) x (m) +2 +1 0 -1 -2 0 1 2 3 4 t (s) x (m) +2 +1 0 -1 -2 0 1 2 3 4 t (s) x (m) +2 +1 0 -1 -2 0 1 2 3 4 t (s) x (m) +2 +1 0 -1 -2 0 1 2 3 4 t (s) x (m) +2 +1 0 -1 -2 0 1 2 3 4 v (m/s) +2 +1 0 -1 -2 t (s) 0 1 2 3 4

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Name ___________________________________ Student ID Number ____________ last first Physics 121A, Summer 2010 Exam 1, page 2 I. Object on track, continued. The graph is repeated for your convenience. 2. (5 pts) Which graph best represents the acceleration versus time for this motion? A. B. C. D. E. t (s) a (m/s 2 ) +2 +1 0 -1 -2 0 1 2 3 4 t (s) a (m/s 2 ) +2 +1 0 -1 -2 0 1 2 3 4 t (s) a (m/s 2 ) +2 +1 0 -1 -2 0 1 2 3 4 t (s) a (m/s 2 ) +2 +1 0 -1 -2 0 1 2 3 4 t (s) a (m/s 2 ) +2 +1 0 -1 -2 0 1 2 3 4 v (m/s) +2 +1 0 -1 -2 t (s) 0 1 2 3 4
Name __ la Ph II . Bor Mou out each Air are i angl 3. (5 p find 4. (5 hor cho 5. ( 9 . 6 __________ ast hysics 121A, S ris Bird is fly untain when riding their h flyer, meas Control, is s in a vertical les to the ho pts) Which d the velocit pts) Suppos rizontal, mea oice best rep 330º A (5 pts) Whic 60 m/s A M v GB A __________ first Summer 2010 ying to his ro n he sees Gle brooms. The sured by Wi shown. All 3 plane, and s rizontal are choice best ty of Glenda se that Glend asured from presents Glen 37º B h choice bes 16 . 6 m/s B B v AM v BM __________ oost on Witc enda and Am e velocity of tch Mtn. 3 flyers some shown. represents th a relative to h da’s direction the positive nda’s directi 60 C st represents 21 . 1 v GM B _____ Stu ch y he relative v himself? n of motion x-axis (hori on of motion Amy’s spee 1 m/s C M v GB v GM = 18 m/ θ udent ID Nu elocity trian relative to B izontal, to th n relative to 30º D ed relative to 21 . 4 m/s D v GM v GB D = s v BM 7 . 0 = ?

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## This note was uploaded on 10/05/2010 for the course PHYS 121 taught by Professor Pedigo during the Spring '10 term at University of Warsaw.

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physics 121 exam 1 solutions - Name last first Student ID...

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