Phys1-T3 - PI—IY 2425: Engineering Physics l we \-...

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Unformatted text preview: PI—IY 2425: Engineering Physics l we \- a...“ Exam iii-A: 19 November. 2001 = - LOG DU SSH; 53 “LE {Last 4 Digits} Name: I.) A steel ball pt'ejeetile of mass, 111 = SCH] gun, is fired lterizentally from a my gun with a spring eenstant. it = Silt} thn. The spring is initiallyr enmpt'essetl frent its natural length by an amount, a = 5.1313 cm. Assume that there is an frietten present, and mat the hall leaves the spring in its relaxed pesitien at the end of the barrel, and that mechanical energy is conserved. Use 3] units! Min“ WW3 / I a ' "I" rf. Ell—{J O 2/. {lit-.1 a I'T'r‘— 'I: 5000'“ : fie”- x~=5flfl ent girfirt .a) What is the muzzle veleeity, v“ in nits, cf the prejectite just as it leaves the my gun? flSSUI't'tB ne receil at the tey gun. Use censervatien nt’ mechanical energy. with elastic potential energy U: i I: HERE? Use SI units! _ --‘r- U ' - .‘ Haiti); - (l: )5— ” a E {a} I .1 .3 f ' rt't if} t 1 19,11 : rmu' t 2’! F. E 1 — jar-tlfrn _ t! * (it as 7“!) = " e. flu—tibia Lb) What is the kinetic energy of the prejeetile just as it leaves the toy gun? Uy/ SI units! 1 .";'|_"]'1:“-'|K.-3;i CE (“9(5le : {j J— I“: III .r-t- 5’ ll L .1 2.) The projectile from the previous problem, at = 51110 gm, is captured by a ballistic pendultnn, M 2 25B gm. Assume that there is no Friction present it: the pivot or due to air drag. rri—_.tl-Stilifg M : cast: its; is} What is the velocity, ‘v’ in mats, of the system {m+l'v1), projectile plus ballistic pendulum, just after collision, t={ll. it" the initial velocity of the projectile just befiore collision, F0- _ was v, From the previous problem? Use the conservation oflinear momentum. Use SI units! / m W. / la" —_ _..- 2P,- t 2P4 ,, mitt. = tro+rvtjv _. m+rul If?! algal.“ (15-5 mfg“; I,» J a ll : t ' - . : 0. £6?) mfg ix" reheat? _i_i}-t'3__."li:f:l') l l / 1b] Through vvhat vertical height, h, does the center ol‘ gravityr oi“ the combined system (m+l'vl}, projectile plus ballistic pendulum, rise after the projectile is captured by the ballistic pendulum? Use the conservation of mechanical energy. Ilse Si units! {Ki-U71- : t'r ratio; If I law-wt: / U1: :1th a h : 3.} A i'flfiflfl kg railread bexear traveling te right at v; = Efl mfg Strikes a aeeend benear efunknewn mass. In; which is at rest. The}: stiek tegelher and metre et‘Tte the right with a speed ef‘r” n = 5 ntfe. v' =2“ mfg Vg=flmf5 l; r:- - a nil: Iflflflt} kg nh=? —:- fi'ig'J'L :0 3.3.} What is the unknewn mass {kg}. 1T1; , 0f the eeeend benear‘? Use l[.‘enaewatien ef anentum. —- F-i e = F ‘ {ii/WV. t :filth ii -: {m I + ml) um J . ' ' '— Il mlivl—nlfl'ifj) . 'l 'l 1 I __ mil; -. mlfill —'1 ml 2 -——_r |flnlli‘ll I mkun ‘il— mLufl "'— T-\l"-1".1‘I"II'-l ' l l I 1"”— _. m; I) / m ( lflrfibfl tq‘} HOW“??- 5 5- : Elma—gut? 1 2'. f ' 5 Mia 3.13] What is the initial tetai kinetie energy efthe twe eeXeare, eeFere eelliaien? / 2 M, 1: :Lrn‘u‘li' : J_ (triflJUC‘F-H‘] (Emma) __ edema-Tm J' N i 1 l 3 : Z'jilil Iii-I l 3.e} What is. the final teta] kinetie energy erthe twe bexears, just after eellisien'? fr “'1 ‘ 2 I: = L [re +me Via} : i (leggemlce L geimiex 5"“ft) ‘5 ‘31 I ' l J / ,1 z 4g» : (mus 4.] Water strikes the turbine blades of a generator at a speed oi‘ VD = 15 [1'th so that the rebounding Velocity of the water just after collision is 35% of its original speed it“ and is in eitaetijg,r the opposite direction just after collision. If the flow rate, niassftime, is fit} kgi’s, what is the average force, F, on the turbine? Va: igfli'r‘rfl 26f ,_..-"'_.-' / Z?) - :2) raw”) or at Etsm) 5.] Four pcint masseei m = 3 kg, 1113: 3 kg, rm = 4 kg, and m4 = H] kg. are lecateti at the ccerdinatee indicated belcw. Assume that this is a two dimensional plane, and that the paint masses lie exactly an the grid points. 2” Calculate the cccrdinatea, in meters, of the center ct“ mass, rum = (xnn, ym. ), Fer the above system of fear pcint masses. Use SI Unite! Note “cm” here means “center 0f mass" NOT “centimeters”! rtfi1kq + mix; 4 mate 4 WT“ H___________________ '1' : W rm 44ml +1113 + Tfiut (3) 4 ELU“e)( i3 - (Lawn; + maxi) mtg) L5+g+h+tfljpg c +3-t3+“0 _51m :I;:;:q m W1L5L 4“ “WT-Liz 4 mag; i ugh ...
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Phys1-T3 - PI—IY 2425: Engineering Physics l we \-...

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