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exam_1_tuethur - 0/13» ' PHYS 122 EXAM 1 September 29,...

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Unformatted text preview: 0/13» ' PHYS 122 EXAM 1 September 29, 2011 Prof. S.M. Bhagat Name: Safuffi 0“ (Sign in ink, print in pencil) Notes- 1. There are six (6) problems in this exam. Please make sure that your copy has all of them. 2. V Please show your work, indicating clearly what formula you used and what the symbols mean. Just writingthe answer will not get you full credit. In stating vectors, give both magnitude and direction. . 3. Write your answers on the sheets provided. 4. Do not forget to write the units. 5. Do not hesitate to ask for clarification at any time during the exam. You may buy a , formula at the cost of one point. Take Care! God Bless You! 2‘ ké=9x109£62L _ ~12’F I 80—9X10 A1 Mass ofproton mp =1.6><10'27kg Mass of electron me = 9 X 10~31kg Elementary Charge 8 = 1.6 x 10~19 C l/a'b Problem 1a A spring-mass system consists of a mass M attached to a spring of spring constant k and placed as shown on a horizontal frictionless table. The spring is unstretched at x = 0. mm.” MW». Wat“ WMWWWMW 0 a) If you pull the mass to X = A, what is the potential energy? (5) b) When you release the mass, Why does it oscillate? _ g (5) .. .4 ' Z > ca l) 22/ P ‘0 \ ' J. l. A 2' / Mr X g” At P5)” 5 1’ l l {ma/g3 ‘3 » lo)WV1€V‘ Lea“) ILL Wes “’3 w M” (éhl’fifléwe‘ci a :4 WW game’s” slM‘A/L “(Tits A waleMmm ’ a» __ fipwq baa V‘evwc’cl? M 5,9 44,» 009%”; x ’ Us mate‘zmegg. “‘6‘” s t w v _ . f’w’w W Lygsp” Pg m Dials” DE...” «as “H v ,p sea-Elsew- wljlezw ‘ Sr weal 2/(3 Problem 1b At What values of x will its kinetic energy equal its potential energy? Why? (6) 'Z, '27 kaau Nigel/1A %MV "3? 2, ,2“, Law» Emma/r3, éllmflm “‘13 l. S’swmew Mmd‘m '2. 3e: lkx'zfle JZjMV g: ’9‘“ Mwét’ my 7 ae L I “11 £4le Sb "éka "" ET 2” .Lw y w )(1; “gym” mm What is a travelling wave? (6) /g 69! ’5‘"; 6%». l C [by (‘ (KL “‘4’ Law-5WD] [#4 bfiw 9L mMM-fya Mm ‘ awa,g9§v§a bu; (M (’7‘ a” gumzyhnm my“ WWW, firm Lk‘gvg Vwe, gay!" 1 [T‘s/9‘ I M I aft/{4, $11.65;} A I gmm ‘3 w ( -—a I Problem 2b As written below the expression for the deviation from equilibrium D has several quantities missing ' D=...sin(x~vt) here D is a physical quantity x is a length V a speed and t a time Justify the quantities yOu need to introduce and explain their physical-significance. (10) m‘méwQMM/MW 5m “63% ,5» We: Mesa-wk. 73 Via/3 ‘ — 1.4 Pr prairie gszxm,2.u/Aiow /"""“"zA M A MA MIT? [tier/1.... LA game m :9, fia‘w'wg/ n SM ‘t/I ' Problem 3a What is sound? (6) :2"; a.) w The speed of sound in air is 340 m/s, Can mechanical waves of wavelengths i) 100m, (ii) 17m, (iii) 0.017111 and (iv) 0.010m be called “sound”? ( 10) Meek/Km 2,0 H a gl‘” at, ’QLVWfi3le/Leg may mm 64 21>, mm: Hz: 20 »- 1?;«mm 510119653? '3 safiéjwo . ‘ .S’o ‘) ND if) W (“9 ya MM At t = O, draw a periodic sound wave as a displacement wave.» (5) Dtfip'fii’cremw Wadi S 5- 5].;(kx-we) :3 i. :D is”: We. Mail” éxpamsi’aw A? W“ A x” if Ania Ave; 0‘ XSvA/LM fiamwflwaflApmmk +«w’e MAX « If G’Y‘ “(tack/L @Ckx w ) Prob. 4b Draw the same sound wave as a Pressure wave. Justify your answer. (7) m) Problem 40 The speed of’sound in a gas is written as Via/WT m Why is there a y on the right side of this equation? (8) i i I R} V xhtg St‘mm wjrplébfeMW Vewtfi mm Pgégt ml VAfuLM r We Meemffw WWW LO/IZ Problem 5a Show that the coulomb law keQQ~ Flzzr implies that like charges repel and unlike charges attract (6) FE: 9? are W “*1 W“: a” A flwyt W2“ 5” mufifim ‘ baht/glib“ ‘ [\(tQ’a/y I \ “w "a: ewe-Maw» WW Ag/Q fl .. \ .... mg!» I"; L9 Q ham DID/Mg, c 55:67AM: a» 2 l W 3*” 4)" A a a M E W .3» 1'2, W me 3 MM kflwgw m I M 5e F K °x Well “my”; {Mg V? WUWZK fa ‘ ,, ,W a. m 3% I ~ Problern 5b I A charge of -20 ,uC is sitting at r = 0 and a particle of mass 0.1 kg is going around it on a circle of ' radius 0.5m at a speed of 10m/s. What is the charge on the particle? Why? (Neglect gravity) (10) "/13 Problem 6a A wave is written as D = 2 N/m2 + 2.1 N/m2 cos(6.28 x + 12.560 , ' 4 Do you think that such a wave can exist? Why? (5) Pg 394 T5 W‘a “'56 e" (0‘ m 33%”sz W “We” , 39/ c: Lbfiéw mam/'62, diamond?” “fli’wug “VH5 (A: gm ( ) hWMwm3 wwwmi 5‘59 "m 1/ PWWM MM km WW6"; “m” m f 5 1‘ ySg’SSM%’ Problem 6b How would you discover the presence of an E ~ field? (5) . v . w “a! g ifimfiflyfi W What is Doppler Effect? (6) l: Iii WV % ($1,, My. ”"‘ my! «:2, “ma-“yam Mme Wu 7 so “mg m ,6 . m ¢£m aura/«adv /”’M "‘4 MW 3"; LIM " \A a, ) I mm V5 MW [3‘74 W 3MW‘MW W I 376 3p ‘ mun-um, t. " - ' w , am mm “WW “'2' m “Wm, ...
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This note was uploaded on 12/28/2011 for the course PHYSICS 122 taught by Professor Bhagat during the Fall '11 term at Maryland.

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exam_1_tuethur - 0/13» ' PHYS 122 EXAM 1 September 29,...

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