Exam 5 - MG mags PageZof5 so uu’Ti‘D N 1(12 pts A 2850...

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Unformatted text preview: MG , mags PageZof5 so uu’Ti‘D N 1 (12 pts) A 2850 lb car on a level road has a speed of‘22 ft/s It is subjected to a driving force of 100‘ lb for 600‘ ft It then coasts for 000‘ ft‘ Finally it is subjected to a 300, lb braking force for 80 ft? What is its final speed? Q’Sec SK—fio "‘ 22 p/Sv:<. Flam. SFEED I mmerEelA‘rE STE—Eb (mi-tic.“ as 42.,‘19+/see\ S'T‘ATE 1 : STATE. 7 ‘ bi, Ne? NEEO 1 - Z Wu”; {1va r 1: 1.5 55 ~— I2 1 23mm 5; a _f_ .2 SE)»: >(Z’L 9/5) 1‘ \oo lb ((600%) s 2' (rely/1 V; 3a0\5( at) 22 ' ‘2 ) \117 36,02 Rise“ Z‘bSL mph F‘ag‘fiTT'm vest "Fem HI) @ m:- Duana 3“ a.) “To aa‘rums (v1: 22c 5 ‘T'Akme l: A; HQcm-mlé ‘93; 2 (12 pts) A 0550 kg K’Nex roller coaster starts from rest Friction and air resistance cause 100 J of energy loss What is the coaster’s speed when it is 0 3 75 in below its starting point? mm m D O 1 “3% ‘— T‘l/(Zzt V53 i439“; 4"grass , \ ~ ' ’L -— 0.55ak-3Cfi.sleis‘\(o.3wsm\'= i(°-°SS°“‘>N1 * “’03 1 1.915 his V2. "5 A> um (“w 3 V2,:‘3131M/5 t 9:53 @ tsvorgmvo Lgfis’ \fli 2-1‘ “)5 (fl-O: £MV2‘LELDO-j V2 <-_\_q‘-~)5 (Cami Apawaa ’Bw 30M<£PTQI~V~V was“) Page 3 of 5 3 (12 pts) Three super -he10es are trying to stop a 12 ton runaway train coasting on a level track at 50 mph They push as shown Ilow far does the train travel before it is stopligggsu lb B=4001b i 8 10 my l =7701b $235 $\ lkr- : 7 yak/Sec ‘73—anr « m. Sago gar. 12tons m: (2 40¢, Zone“: 1745’?) slug 2 h gala/52. +0” V LATER—p \ Z #L L. l _V 1: €21} ‘ ‘ (Arm S'in Loaf-.773 “a an 2" cl al; (7 45:3 sla‘)\(”7-3;'$3 “LY; ‘°"‘°4 A}: \313 $1 210‘]ch . §r_ _- @mwa or 6:3, v15JH G? “0" WWW“ ‘1 ‘1 (9° W” 6;) Mom. 551: \L “T1: «was Cg) No”? «Minimum: mpk‘u ell: 81¢ «9+ 4‘ (12 pts) The electric motor of an escalator requires 411 W of electricity to raise 200 lb 51 vertical distance of 18 ft in 14 seconds What is the efficiency of the system? 84,81 it“: P~ YE . Z°°\E_‘__—-‘%C‘L -: arm2 [22 ‘ i; ‘ Mm Lb; , : 342,cm _ ..\i,‘ .. zsti” ’Sfic‘ggofiuibiw WP Em , 348-9“ z 0.3422 ? Cmfi a” e A“ b) “J 4},“ 3w mail @ NV;- cowgs‘rmc Sch (92.9 10 Page 4 of 5 Page 5 of 5 5 (12 pts) A box is along being pulled along a rough horizontal surface as shown It the box ‘7 (1‘2 ptS) A pendulum is pulled back as shewn and released fiom rest” What is the maximum starts with a velocity of 2 ‘50 m/s to the lefi, What is its velocity after it has traveled ll 0 m? : 161181011 m the stung? E; ‘: _ t l i t t ha .— owwm «M :: o/otlnl m G if) a D ya‘PE *% ‘— KEe‘tfiéJV y”; t I , l ' W 3. ’ 3'»! - KA mi Col-LAST 0% @ii’k‘k330136l'3éACU-Wms » Ziyénelzé) U1 Wk 0: Ciliaé‘w Wilma-EM _ M6595, \J : 0.61015 M/s "’5? (MC \ e 6‘ (12 pts) A box sliding on an ice rink encounters a spring attached to the wall as Shown The spring has an initial compression of 050 feet What is the maximum compression of the spiing (as measuied from its unsuetched length)? Ignore fijctjon and air resistance a) A ball tied to a string is being whirled in a circle at a constant speed What can you say about the work done by the tension in the string? v:5.50 fi/sI N = O banshee ~99 roe. MA 5\i\$?‘lmc.€whm¥ \ is; ill” k=3301b/ft are 510° atomi- N: figm§$ g 81315519 a l 6 slugs b) When you pay the electric company by the kilowatt-hour, What are you actually paying for? aim/3g thté’té. MOT Power p- L r a ‘ 0) Paul and Kathleen both start from rest at the top of‘the waterslide - in «a '3 <1 jg (31;, (F, f - \ 7, , 3' .\ Ifyou ignore friction and air resistance, what can you say about th ,‘ Q g E *'= atthe bottomoftheslide? fime beams, ‘i’itexi si-mi QM ewe he} We Muse aloe-g, NOT lom‘iei‘u y“ 3 \31 v = E l ‘ r ' _ _\ ‘ “l 1 a“ :J‘ a“ i A d) Give two examples of conserv tive forces and two ex ples ofnon-conse tive forces 1 b"; - {bl-rm 5‘2“) \nt 7 flu » c. \ I : Path—l4 / growflw \ NOTE {bitten Pfi‘“ \‘AAEPtAAMAk Spun if“ Masks.le mag M, ‘c Maj ...
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Exam 5 - MG mags PageZof5 so uu’Ti‘D N 1(12 pts A 2850...

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