Download Physics Exam 1150 - Exam 2: Questions on Acceleration, Forces, and Circular Motion - Prof. and more Exams Physics in PDF only on Docsity! Ati b {,t'f &"2 , v B-5- ,7 f,,-oo, 'd !:t.ry F_t?t t Physics 1150 - Exam 2 10120109 Choose 4 of the 5 labeled parts to do. Each part is worth 25 points. PLACE AN X THROUGH THE PART OF THE TEST YOU DO NOT WANT GRADED! ! ! ! ! Part 1: 1 - A. If a car accelerates around a curve, which of the following is NOT true? v' B . a " - - v / /L. * t : x i*v1+!a, t2 n ' 2 AvC.o,=7. @"t r t ,= x. *v , t * -a^ t -t t 2 0 1 - B. A person stands in an elevator that is speeding up as it rises. Which of the following is true? ("0 o,",^", - m(g + a) i 1 B. F,o,^or - mg A 6. F,o,^o, - m(g - a) t * to_ D. F,o,^ot - m(a - g) io, 11 I l " - r . r : rv1*-' 1 1 - c. If I push on an object with l0N of force, but the "[jU JJ#rirl$tt;#]$'ifi* of the following is true? A' f ,toti" < l0 N B. .fnoti" < 10 N p f,,o,,"=10 N B. much greater than 20 N D. much less than 20 N. ! i;", I h\ t ! D. I need information about the normal force to answer this question. i -r, [o"f-E1---* Ssi*r,r ! I )' * trti-'l- . Hdo *r ;f3 ' l-p"h 1 - D. When you drive around a curve at constant speed, you feel as if you are being pushed outward, away from the center of the circle. In reality you are A. being pushed outward, away from the center of the circle. (*ei"i pushed inward, toward the center of the circle. t. not being pushed at all,you a.re not accelerating. D. being pushed tangentially . w&h Q r'ov\ -t.L'ta 1v 1 f at v I - E. The Earth exerts a force of 20 N on my dog. My dog exerts a force of on the Earth. @zoN c.0N Part2z 2 - A. (10 pts) Explain the difference, if any, between the following acceleration: radial, centripetal, tangential, net. q4 i&r^Jr-f4ArrA uculJrrrrlro- (q"\ ts v\trt uti$."Jcr* " *.*ti*o-$ tc,"|^ O.' $ +L z\ v-odr a-A &c{4.L0^c,-! tcrn Qr' - (-. (6'" ' - A- fr ) - Av *$ x) {"arngooru; rc-.1 &r.u"t-n*'a} tcm ocur;ut 4 spsd e"hr'a'rtg* $ ( &$ * + ) .x5 "l) d^q+ - &" i . Ao 6 2 -8.(15 pts) Two masse s, ffir = 5 kg and ' ffiz = 2kgrsit on a frictionless, triangular block as ; shown to the right. The blocks are connected by a i lightweight cord over a lightrveight, frictionless pulley. :, The blocks are released from rest and begin to accelerate. What are the values of the acceleration and the tension in the rope? : 1 i Fr.,, stn€, - T= m,( tI nA,3 Stn€, - T= fr l ,CI. ,J 1rn9, - Iv \ , ( Tr (s !\tg 8"/sz) sr n{,oo ,! (a I f r l - F - ' r1 t \ . / , 1 4 :? ) ( v \ .^y fyrrrtitQT-;.ff tri/'' " " e l/- s r3., Flr: Stnb a T - fg t . l .S tnOa =Wz& + I T -mzSs l f \Qz , f r l z& f= * r3Sr f i Oa + v 'nz6 ' T ; (2 l cg )19 .8* l te ) S rnL{ ( ' ZbO T. : IZ.U t\t t- Z k3 (c.. \ ' l X. T= 4?,1{LtN -_skgk- l r l +@ *__**-- , ,/ / - , r , - , ( q2 'qqru -5k3{a ) 3 i z 'b rJ td "k { ' (a l \ Z l tYHr : QV 'n (q I r I ' - = - l a t ,L l , z te t l se l| - '_ '___ _- ' r T, ,{? {q N - gL3e,r6*/5,,) .}t 3 N 'Tl }t
