# Exam 2 - Page 2 of 6 1 Professor L B Overholt is returning...

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Unformatted text preview: Page 2 of 6 1 Professor L B Overholt is returning home after running some errands His position relative to campus is described by the function 5 = 6t3 ~12r + 8 where the position is measured in feet and the time in minutes What is Professor Overholt's velocity at t=12 0 minutes? 2 Betsy brings her new remote control Mini—Me Mini Cooper into Estabrook 111 We set up a start and ' finish line exactly 50 0 ft apart We give the MMMC a running start and measure its velocity at the starting line to be +45 1 ft/sec Wow! it crosses the finish line 1 ‘50 seconds later Assuming constant acceleration, what was the acceleration of the Mini Cooper? (‘2) “Jr‘fgtﬂ? ages; \$o0f+€lt ‘2} MC}. 52* {smarts I ‘\ .r'“ {33.32: 2 (tosgiraosﬁ) ‘51”: bi?) 9" - .é Mg _ { “AZ. “.3; M \$3! 4/ it}! (fr Egg-E Constant Acceleration Equations: 2 2 v —v sz=sl+[v1+v2]Ar 82 = 51+ VIAI + i—aAr2 52=sl+- 2 1 v2=v1+aAt 2 2a Page 3 of 6 3,4 Sketch the velocity and acceleration graphs for the following moving car scenario You must show your work when calculating the appropriate velocity and acceleration values A. Start at velocity of 40 mph. B Accelerate at a constant rate of +5 mph/second for 10 seconds 0 Travel at a constant speed for 20 seconds D Slow down to a stop at a constant rate in 5 seconds 50 40 If ? “l A 30 VD“ I“; “FE E 20 W E ﬂvbﬂtﬂﬂ Qi’l—t‘ .3 _ “ g o M~<s\?‘rl'2§lo%. -10 w ram 4; -20 A a D 5 10 15 20 25 30 35 40 U :1 V + u Time (sec) 29 D Dim *- «lo—+50 1—}. D i i ‘6‘! E 9‘ 5 .02 J: .2: a .. M .5 0 30-35 ' E 2 ‘ - -5 :- Q39 < his -10 i - ---------------------------------------- -- canamltmpvg : -g D 5 10 15 20 25 30 35 40 Time(sec) GEL) no use) {JV @ Q,th (:9 W2€3 “0+ \$th V36. Constant Acceleration Equations: 2 2 12+ V ‘V 52=5l+[1 v2JAt 32 = 51+ let+ é—aAﬁ 52=sl+ 2 1 2 Page 4 of 6 5 Paul Karakashian’s average speed is known to be 2.50 mph After drinking four Red Bull energy drinks, he rides his bike for 1/4 mile at 15 mph How long must he stand still to maintain his average speed? :7 ir- tn: A—iﬁh: :: big-35hr”; O‘Oﬁg‘) r. “ﬂee [gm/iii” P = A3 a- Mi. 5 I \ w 69 e ﬂ A£10A hr 2 t a / At m: 6+CMA Z tsfwtk 4: kt" triéte, 1 'hr 2 Oikkr“ / ‘ weir-e I 010%?3 H“ or f) m A oi" 5.00 52; ' in 3 00 seconds and then maintains a constant veiocity forthe rest of the race What was her time for the race? 33/ We _ . j I (3:4: sec, « a '3 t 7 tée 81 O “to 3 sec 6 - I 3 M I As H t o m 53) 3 + OT § (3) 2... A3 "*3 -— :q :1 7‘ 1239'” m t: rue“, “ K I I use @5254 as at, 352:. O gmmk t15.553e_¢ r“ M a- “(a @1235 and" foo ' {2/599 + g ZLI {: O (dinette, rmﬁ a Um ': @543 o oer“ tee-w 7’ 5 Deg—7“!“ {055% ‘” {we 3% ' ' 3 cages Wee. ConstantAcceleration Equations: E: 1‘- Z‘JNE sec. ' 2 _ 2 52=sl+["1:v2]m S2 = 51+V1At+ é—aAt2 52=si+vzzav1 v2=vl+aAt Page 5 of 6 7‘ An accident reconstructionist measures the skid marks of a 4350 lb car to be 105 ft Assume that the brakes of the car can slow the car down at a constant rate of 9.0 ft.’sec2 and that the car comes to a complete stop without hitting anything How fast was the car going when it started skidding? 8‘ A rocket ship in outer space has a velocity of 2 15 km/s How long would it take to slow the rocket down to 055 km/s if its reverse thrusters produce a constant acceleration of —2 85g? (A): a. \$7.13 \$34.. Uls‘mﬁ ‘DOMilliﬂm mt «Summit-«3 ‘Wn i“ “*1 (orgasm ma.) 5., 4) usual 1\St>-t5\$'o (935.25“) U5‘nn‘1 a: Lust“:A as 2:37:318t “)5?- Constant Acceleration Equations? 2 2 v+ v —v 5 =5 + .1 V2 At 52 — 51+ VlAI‘i' —; aAl‘z 52—51 2 1 v2_vl aAt 2 1 2 20 __.__u. ._..._ u__._ r Page 6 of 6 9 Patrick climbs to the top of the 132 ft tall crane outside of Estabrook and throws a tennis ball straight up with a velocity of 24 0 this What is the velocity of the tennis ball just before it hits the ground? Neglect air resistance and use a coordinate system with positive being up _:i (an Si:on g :1 :3 (-92.2. 9253 @ Akcuegltero. ti: J'er Lh- gamg 2 t}\32\(~"‘a?~1\)'24 10. The tennis be]! of the previous problem hits and bounces off the ground The time from when it bounces off the ground until it hits the ground again is 2.78 seconds” How high did it bounce? (hint: you do not need any information from the previous problem to calculate this answer) sir. .i 3 \ A 1' pt Hﬂrﬁaﬁlfe ‘Wtﬂm M ‘3 2 on. d, .i ‘ N5: “‘ is) j; 5;“: Siﬁ'viht' ‘ 2. g fat \\ 32. J” 3 m "2:333 J 3‘ "3&1??ka ' L _ .25?" 2 ("247533 b --'?_‘ “ MTWM _ ﬂ - i O‘mtVi(?-¥"l% 2&3? A“; 3 g '2 2. - i 3 , a. ., -\' ‘, 4 E. x 2 Vii: ‘lédtenp/s Sl‘g's “V31” Zak i ‘ thijbﬁs <32- . z i- 4 Viast a 's. agtou'b’ﬁid *E( A S 2 S\+ M a 2., 6a.. a 2 ‘ W31 SgbB‘J‘ My e em - + M W?“ 33 (D ‘2. (“'3 341 gaffe; \ 5? .m _ a ‘L D {t an: a Lair 3 {slit tat“ @Fns3 V1) HM" L” “3 ° “‘3 "m 7 2, l 3' “:1 2‘ ,4 (:3) a (DSC23113) 1 4 ENDOF TEST! Be sure to double check your work.. Don’t forget units, significant digits, vector directions, etci. Constant Acceleration Equations: + v2 —v2 52:51+[v12v2]m 52 = sl+ler+;—aAt2 52=sl+ 22 1 v2=v1+aAr a ...
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Exam 2 - Page 2 of 6 1 Professor L B Overholt is returning...

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