tuth_exam_1 - Mb February 24, 2011 Prof. S. M. Bhagat PHYS...

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Unformatted text preview: Mb February 24, 2011 Prof. S. M. Bhagat PHYS 121 EXAM I Name: SAL N (Sign in ink, print in pencil) Notes 1) There are six (6) problems in this exam. Please make sure that your copy has all of them. 2) Please ShOW your work indicating clearly what formula you used and what the symbols mean. Just writing the answer will not get you full credit.‘ In stating vectors give both magnitude and direction. < 3) Write your answers on the sheets provided. 4) Do not forget to write the units. 5) ' Do not hesitate to ask for clarification at any time during the exam. You may ‘buy a formula at the cost of one point. ' ' Best of Luck! God Bless You! Problem 1 You start from home along a straight road (x-axis) at 30 mph. After 40 minutes, you run out of gas. To reach a gas station you walk back 3 km in 45 minutes. What is your (i) average speed, (ii) average velocity by the time you return to your car? Why? [Assume 1 mile = 1.61km], 30mph: 3w v A c r lot/grL/W/g. (6,10) 3506) d\ I X?- W M xi . may no w New 3:. 32am. g I! all: 413: 35:99»er AIW 6194;.L ~—-w TVM-t/ "Ta/‘3‘ 63"“ J3 ‘ fawn” <S'> ‘7: W = I . A V / | 49" $37” g A. ’ ,ur Problem 2 The motion of an object is described by the equation 1; = (15—20t+5t2)m$c Where time is in seconds. Calculate (i) Position at t = 10 sec (3) (ii) Velocity at t = 10 sec ' (3) (iii) Times when x = 0 (10) I” ,e/nen/a/e Z q. - g X: heat/L264? w»: )x WASH/12w fl A \ IDJvac] — 05-“ ZDx/D +3 3x120) my Ly A, 5' 315% X A. ‘ V - (VJ-Fab) X [’7) -e " 2 Q dz; K 9.. w‘) a = MHZ” *fl 5%; A D “4.140 {at .. 25 i/iLaf/wj 5:; 7f, M _ m 4' 475?; Problem 3 A ball is thrown vertically upward (+ f») and reaches a height of 10m before it returns to ground. (i) Why does it stop rising? (ii) What is its acceleration at y = 10111? (iii) What was the initial velocity? (iv) How long before it returns to ground? (3,5,6,6) I L k“ 2’ qt; %Aw0. Li) Became L"’97 Uga’acwigéa A «Jaw art/heat u. “new <79" 5%“ P’ ' ,9 bibreck mag/L EM Ur) v2”- Wvoza- “WWW , i. lama Lat, =50 “Dow. V230 W‘W'e‘m” d; “a” 1%.»52U0 22,. Lav) ‘37» 3" “V4; 11:10 we“ have 7/5 WV” dqfl‘zfltj/E: a a-r Wait 26% "' “$37” 3%fifiw’ Problem 4 A player kicks a ball at angle of 53° above the horizon. If the range is 30m, how high did the ball go before returning to ground? sz’D/fl 7:13., ‘4- Ffifr an, kpcaeiuz l cauAA¢;r,4g‘;LJ\ L4gw‘caz; :jaen A‘:;x 2;” U‘ M MW @L‘ .a/Qawe, We) "6‘me L :19], a VE‘SM'L Wt WP M» é Ramaé ‘2 $W.2L520 ‘i'df ysktai (:Lfialgri 50; 2/521, 7—: 2' 5’ hf :- W D 4”? +aman EEK, —~ W520 349 Xfflmfl :1 W fl Mffl L34»? L, 2 QB.“ 34 ‘25:; {4f :1 H5“ (16) Problem 5 a) Every object near Earth experiences a force [If = —M g1a where Fis along the radius. Where would you locate the reaction force to E ? Why? (8) {bi}, N—buf‘lvm [O EVflL Ana/waif" '5 “a” Problem 5 b) What is an inertial observer? (3) L; .5 fluke/t Mam/WM, [AVif‘sz 3L0 be“: sz‘ia’fi’ '7 5/0 21540 fiéael‘wMLh“-* awe. 6” W41 6% M WM»! cm Of a h “M WM!“wa m 6455;» Y‘ Mm? WM WFV—«WJM Problem 6 You attach a mass of 1kg to the end of a veltical spring. (i) Why does the spring stretch? (ii) If the spring constant is 500 N/m, how large is the stretch? (8,8) .13? T T A? V WZW M K. _ ' fact, 525’ Wage! W .. t m 5pm!» T31, Yéb’, . 7" “a mp (3;? +2) cm 61/“ as, 59W 7. gmd’, £1, "Came. .59“ so A»? mat?“ M . A CH Warm Fug} 53—4., if :7 . A gvt‘mu, Mg. “15 M "g , .S’DQE TON. “we” lgpnnfiv was?“ A fl’fi A3= “fiflg' 5w ’3 3W5 ...
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tuth_exam_1 - Mb February 24, 2011 Prof. S. M. Bhagat PHYS...

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