General Physics I - Solutions for Exam 2 | PHY 2048, Exams of Physics

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So lation May |, to Exam 2 (03/01/2010), PHY 2048 Section 801, Spring 2010 ‘Your Name: your student ID #: 75.26 (a) 1. A 5.00-kg object placed on a frictionless horizontal table is connected with a hanging 9.00kg object through a weightless string and pulley system, Find the acceleration of the objects and the “47 tension in the string. (Ch 5) uy —_ y ty = = Ma 4 Le T 7 me - ql? 4) bras -~T=mMa qs | ne} 1 4@). my = bite)yar k= cere > ws, cosy itm, = & = §-30(/57) (a}6.30 m/s’, 31.5N J.00+ Foow B. 3.40 m/s’, 11.6N Substitnte Tn / ot 7 . 2.50 mvs’, 45.5N mPa 6 tere T= maa Cm) (6-30) 3h 5m) d. 1.30 m/s’, 10.0N e. 10.3 m/s”, 61.0N £24025) 2. A block of mass mt is pushed on an inclined plane of angle 6=20° with initial velocity 5.00m/s. wv (lat if the kinetic friction coefficient px is 0.20, how far up the block can go before coming to rest? (Ch 5) Solution [USE Newton's Low fr ~_% fu Xe ditection » f,+ Mg o-§ = me a> ee, Y. direction, Jy mo eed =O @) oft ' yng ™ tye fen > From 77.8 @7, fy = f'n mg ase > a 3.3m Substitute 2 rote 7: [Me dog &36 PAGO“ = ma b. 2.0m QK= . © 24m a) CSO FZ AHO = (0-30) (4.6) ire? +4 4.8) pode? ad 17m = $19 ys?) 2 ot 2 e 12m Vpeus +20 ox 7? Ox= Vale Ve = 0 =(s) =~ 24m ds boxe BO 2st = Px]eIy (a) 3. A small plastic sphere has mass m = 2.00 g falling through an oil tank. If its terminal velocity is vr= 5.00 cm/s, determine the time constant 7 and the time it takes the sphere to reach 90% of its inal speed. (Ch 6) w3 ™ . os . a, /5.10 ms, 11.7 ms Viz a > b= PS Genes) _, BFalegfs b. 2.10 ms, 1.70 ms Vy .00 x10"? c 3,00. ms, 10.0 ms ~ om Roxy? d. 1.00. ms, 2.75 ms t= oS HED = Shom sy e. 4.80 ms, 6.30 ms e wd, z Vev, (-e@ ge % _ Yer o- ty t-e = fu e = Oryy wp = = by wwys- 222 te 2-20 = 2-H BC Oy ms = rues?