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quiz1-sols

# quiz1-sols - PHYS 121 QUIZ No'l Section No 1 Name 0101[2...

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PHYS 121 QUIZ No. 'l Section No. 0101 Name 1. [2 points] [Figure I] shows the position graph of a car traveling on a straight road. The velocity at instant I is velocity at instant 2 is A. positive, positive R. positive, negative @ negative, negative D. negative, zero E. positive, zero and the ur#' Va Sl"pe Tn )f -t Er"?h [2 points] Velocity-versus-time graphs for three drag racers are shown in [Figure tr]. At t : 5.0 s, which car has traveled the furtherest? A. Andv @r"rri C. Carl D. All have traveled the same distance Al n Nua- rn V-x 7r^Ph' !at4es+ &!ea ' v, (m/s) 40 r (s) r (s) r (s) 0 Andy 5.0 Beuy [Figure III 5.0 Carl 5.0 J. [2 points] Acceleration-versus-time a graphs for traveling caxs are shown I t in [Figure III] and [Figure tV]. Find i I the velociry-versus-time graphs i L------l corresponding to [Fizure IIII and I [Figure tV1, respectivel"ly. i Figurc rr- i B' v' c'" N_-, F-,[ _, rT_ Figurc IV v, ln [Figure III] a:4 [Figure IV] * C [Figure Il v, (mls) v, (m/s) ; A n dop m V-t fla?h.

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,T H=ts [total 14 points] Heather and Jerry are standing on a bridge 57m above the river. Heather throws a rock straight down with a speed of 18m/s. Jerry at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance. (Gravitational acceleration is g = 9.8 m/sz). PartA. How much time elapses between the first splash and the second splash? Express your answer using two significant figures. {ewg Hea+naa Ufrt): b* V"t - *gP , VntD = 4o - Tb J.nU tjrrt) = V.+)/ot -*5tt , VrLt): V" -7b' Uthon Trwu\ t>ock c6yva hocL +o avyw! posi+ur! :V" .i/ V"-- tgmls Uu :o : Vrt -*JL' - tt l,L - {Zt) r. ^;' -_ fr sa:'::! ='1 0 -2v' = J -€ q.e#t,-= 3' 7 s r*;: Part B. Which rock has the faster speed as it hits the water? I s ghouvt rrL F* A, [ufu"4 -f.n'l) /)odc covne- ba.lc 'a ,* orrVna/ pon-rri" [ !:o rn the aboue /ryure), -tlv- yelac.t-t! f. -V, - n - 4^e r'atna .T7lryrli+r..-Q & d,tredfrh aA t?ea&erS .tZ 7hu*fit, Lk^hrt.r*\ ./za<k & J"rt b 2,,ck an7/ larre -/hP' a.4 *ry h"l 4u aY'E t- 447,v0 5. [Bonus Problem: 3 points] Make velocity-versus-time graphs of Heather and Jerry's motion ir the above problem. Tinke downward direction to be positive y - direction. Include both graphs (Heather's and Jerry's) in one plot. V. o -vo v +h.il|'s O\4 ts fiocb-
PHYS 12{ QUIZ No.

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