~~r ~dl~~ l' 1/1) (f!j)~ .-~e.-.",.d IOJIol6J it -.11 "P--~ZD.. r;.,.~ I-S 3~~'S) ...t.Jo~.Page 3 of 16~'Pw~ .l1b!n.eIJo.16~G)1t6-{d.8d~i. .Exam I: Physics 121 F03 James J. GriffinOctober 3, 2003 Physics 2109/Tel.301-405-6118Exam I, Part I: Multiple ChoiceThis Part I of Exam I consists of 16 parts worth 6 points each and comprises 80% of thefull exam. For each problem fill in the circle next to the letter of your chosen answer onthe NCS answer sheet using a #2 pencil, making sure that the number of the linecorresponds to the number of the problem you are answering. There is only one correctanswer for each problem, and no subtractions will be made for wrong answers.Use only lines 1 through 16 on the NCS sheet.d. x/y = Cos ~ 2 (') l.fr ~ .lfr- @ ~)~ X(t) = Xo + Vo t JJ 'li. ; d.4--S/~/t;g 2. IJ/ ~ (LL.T e) L ~ L. ..,. ~L'.@ !-1" ~ c,..-d cJ dl d~).I; m d,)11~/AI~ In e.#k4S IS;e..t"(Over for Page 4 of 16)1. Which of the equations below is dimensionally incorrect?Insert the letter of your chosen answer into your liC$' answer sh~.a. v2 = VO2 +2ax -1 (Llr) .I :" l'lr}2 of 2 (i;r~L fdib. a = ao + v!t £L( lLooI 'Ir /2',Ic. v=xlt A 'J L.lra :. "7 + 7'1 ~1'2.&IPage 4 of 16Exam I: Physics 121 F03October 3,2003James J. GriffinPhysics 2109fTel.301-405-61183. Suppose that 2 macrol!:letoerites per century strike each square meter of the surface of some distant moon,and that each a sphere ofrndius 0.3 mrn. Given that a year isabout 3x107 s, how many seconds would it taketo cover the moon's surf~ce with meteorites UD to-a dep!llJJfAfi-C1ll? A ~~-~ 3 -A L (.JL. rr~/-')1f1. A L 'ttt -D--IJV. /0 .tJ .:f.- ~ --u~r--- -10 3(J'YI ~"Wl.l.4 )rI6A ..,~ Ff1'P"' 6 'l..I'8~- ~.1 (~ "ID-;~3= Z..z X t() ,...£ J. "&.n1J ~6S (l ~ 1zr,,", (0./"..7;JJ :::(J.2It L~ :: 2Xlo..~~ "Z0- AII..-~/ .At ~ R=~'1Y)tl2 F~ 3x(~-P'<-71 ---' N- V /".. I-~ ,/}1jZ 'JIM-. 1t~ ~ -;;~j: Rt ~ ".t7'Jlo7~t".}M'.~ 6- II~ "Jl1' 1"1~ 11, ) ~ II =- er ~ .2.~'tf..,... I~ ~ .fo a-.is/( ...~ .f",c. ~ ..fi.\ tpl.IA.t A t 1111-Vh -". "T ~'(1.V" Ia d ,- = IJjRI\=. I ~ uA -~ 'K' ". "7 A IA= tJ.3 XI"/~+1z E~ rl> t~ ~a) 1027 Sf. Maria throws two stones from the top edge of a building with a speed of 20 m/s. She thrOws one straight down andthe other straight up. The fIrst one hits the street in a time t I. How much later is it before ~nd stone hits,~~~1:~ 5 s 1f; : ::!- 2lJ ~ L~ .$~T,,;;;;;j;T~ i:il .,. 2IJ ':Ntf14:.. .s/~ j 4-1 1- -/~ 4s D y,-r. ! .~ ~-L... .aT 111 1111~c. 3 s '-- d vtfC-/ ~l-f'-1 ~il If ~d. 2~ 11- IA-.:f ..1- t -7f;,/. ~ ~.e. 1 s ,D t'a r- jLl., L- ,/a -J~~ -L 4 I'~L b..eJ'} ~ /D ~ 6 J pf'T -z; 2. ~ e; --~ -LJiK 1r~ii:i---~ z.o-- ry ~ .~ 1/Vol1'Hc.L ~ ~J:S 1t> r;tt, -~-2.0 F<L ..iJIJ.. ~ .-1.-1J~O.-1~ 1'1 ~ 1 f ~ il ~~ Y8 dt. ~ , wd1- "IfO' -:::-i1- .,.. i2.. 't tl t$ tf~ '-ft 4 k l.~ := 2. "'D4 .At-:::JI.I1J-t,-: 2t.l..= 2.zrLJ4:/~~ (j;)IS~.f1I.teLh'~ i2. .j,JbL.~6.-J~'T -lIf-1-1Jo 2tJ-f:z.. :. -=- -= 2.01 1.Sb) 1024 S1021 SSS£Xr.P3Page 5 of 16Exam I: Physics 121 F03October 3, 2003James I. GriffinPhysics 2109rrel.301-405-6118s: A parachutist jumps out of an airplane and accelerates with gravity to a maximum velocity of 58.8 mls in 6.00 seconds. Shethen pulls the parachute cord and aftera 4.0o-second constant deceleration, descends at 10.0 mls for 60.0 seconds, --reaching the ground. From what height did the parachutist jump, most nearly? .-->'\ I d A I.t ~ -It,Q 914 m ~J d< -t < c6.be C...lf...:::i 6~<.J-;.;;; I.S' 1: -cy. eo "t/t'G2. OM- cr~ 1130m ft, JiJ~~ IA'1t-ltz.c. 1520m {l) ~.~ <6 < J"Uc JI d~~t4I\ ~ s-e. t1 ~KG" cd. 1750 m ~W"'..lL ...I -/A.LJ ""A 'C 9 ~ 'I-= -hJe. 1843 m (J) Ib <-t < 7d~c. Ch.1 -a uI ..L t~ :~L1. '0) = 17'. f..1'L- I~.l.t ,,= Ih,l-f "2. + 'J ) ~ Ilt,F 2.\~i ~~«-..8\/A.c1+-J;.(a2..Z.)l'~),. -// .A -~ t + :f: ~ -r.. v:,.(. v 2.~ I~ ~11--" ~d t')l. +~. 'iJz.- f a~tl. .s:e 8 ~ = -<.1s: Z + , L'.~/J(.' Q.l.. = -/d~ .= ...'2.2 ~G2. ...7 /. h = 1"1~')J1:4 A'd L. 0::; -'"- Lg .c.. , 'Z.'Vi .i.1 =ql+ ~» ~ t6ll -I 1"37.1.-117'.1~2~ .If the displacement of an object is given in SI units by x( t) = -3 t + 4 t- , at t = 2 s its velocity and acceleration are, respectively; "\~ci ~~J ,+ ~ ~ 't1~~3~::!> q{:l} ~4b) r4sJ.,.<.1 'Y6sJt"t 15 ., Jttl~(Over for Page 6 of 16)L~ pos~t~ve, poslu~e0: positive, negativec. negat~ve, neg~~ve )( {t::::oO) -= () :: .Ir ld. negative, posItive( ,\ --3 -t +e. None of the above, because the signs change with time. X -t= II -+ .t : + 10~ -, X {-t := t;) = -t... .~d i.f1 M i,,1 ; ~ ,J, t=-2. X l..r p£xrPage 6 of 16Exam I: Physics 121 F03October 3, 2003J ames J. GriffinPhysics 2109rrel.301-405-61187. Five boys are pushing on a snowball, and each is pushing with a force of 10.0 N. However, each boy is pushing in adifferent direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle ofo45.0 relative to his neighbor.) What is the magnitude of the total force on the ball?~~ ~7.1N V£~ ~ IS f'~~ PI t F'1-T F) + F +-&- ~(C":) 24.1N ~ ~~-+)-~)~ 27.1 N E~'i-pller- 1.,.,£ ID t.;r~ 1-&1 -~T. re. 34.1N g ~ ~pIItleo& ., -l1rU:=: "~",~J/$ ::: ( " i~ I" +-"B. A helicopter is traveling at 40 m/s at a constant altitude of 100 m over a level field. If a wheel falls off thehelicopter, with what speed will it hit the ground? (g = 9.8 m/S2 and air resistance is negligible.)a. 40 m/s ~-b. 50 m/s -( ) (4 IJ)(C:-) 60 m/s -Vd = "V4X, Vo~ =- ~ } Je" .( ~<"=[': 1Om/s --44 -t() = ~, J~e.-~~L- "r'::" 1JD~+a.x.t -,1Jf ~ Vo..+~'4t- : 1J~ t"4t ,=-0~J c.J&...Jsht~ ,.-:1 q 48"' cJ -I1d" A"'J .: -~~-t!~I .0{ .4 ..= f2M/i'x~ -: -, .eo)1\~ 1.w:- \~\: ~~A~~= ~~...~I~ :' 5"1.1l!-~.~ I,(j ~@ t ..( t.-d-M,LJJJe:4£'""~.{F.c\. J~. \fi""' ~ Il>+ J+.I+(!If>/~~xIPage 7 of 16Exam I: Physics 121 F03October 3, 2003J ames J. GriffinPhysics 2109rrel.301-405-6118edge does the stone travel horizontally? (g = 9.8 mfs2 and air
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