prac exam 3 - EXAM I GENERAL PHYSICS II SPRING QUARTER 2001...

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Unformatted text preview: EXAM I GENERAL PHYSICS II SPRING QUARTER 2001 April 20, 2001 Name {ex 7 Student ID # Lecture Instructor Section Number Full credit will only be awarded to answers with all work shown. l/(41teo) = 9 x 10° N MC2 60 = 8.85 x 10"2 C2/N m2 e= 1.6x 104°C PROBLEM SCORE l. l 26 2. l 25 3. / 25 TOTAL SCORE / 100 4. / 24 PROBLEMS % l. A 600 g mass is hung from a vertical spring. It oscillates up and down with a period of 7’ “R 0500 s. The mass is pushed up from its equilibrium position (y = 0) by 10.0 cm and gory}. released. (a) Write an equation for the vertical position of the mass as a function of time, t, after the mass was released. (b) What is the maximum speed of the mass? (c) What is the spring constant, k, of the spring? (d) What is the maximuxiifiorce exerted on the mass? (e) If the mass were given an initial downward speed of 1 m/s at t = 0, instead of being , dxs released from rest, what would be the new answers for parts (b) and (c). // 5'“ v y (a) wcij’g’ 9%: ‘flg' 32.57Hz— 700 = y," 60500144?) it t-o «)1 ==> :0 ; 1.5125“. 4, 69 Y’ "i —- i, j ym If, 7, 1 (a! m> CO9 (9fx> /; w, Jzo . m A}: (974* nihwhsJA/[wfl/W @ fl: = in w = (0') w) [tr/961.29 V5 (‘9‘ \1 (0 A Mw‘ : (was mm“ Maw/M (ow r: W = (“We (aims -=/‘q‘."w .) 1 n K)“: 2' 93¢, Two point charges with charge +q are arranged on a square grid as shown in figure (a) below. in 6 Qt} a. Draw arrows on figure (a) to indicate the direction of the electric field at points R. S. and T. If the electric field is zero at any of these points. state that explicitly. Z30 ) Staca 1:» TEAM T, 014* Lingo, is Oflu‘wl ig‘Mf/nzldclt @ Akéfir’m orfvSITL drier, (014. ¢\) chhfed Tg E; )5 her? zed I . 11" Y; kT. 719, E75 0‘9 Lo“: ' a l cut} Ex, 5 6 ckayesfwzc‘» Add. E : Err-E" f . "’ = 2" 2, am. awe We + if c‘+‘flw9 Z, angered A031; E} b. Suppose a third point charge with charge +2q is added as shown in figure (b). i. Will the magnitude of the electric field at point decrease. or remain the same? Explain. . ii. Will the magnitude of the electric field at point S increase. decrease, or Explain. (IL) increase ; EK Mu) ~ huh zero a)“, To E 0? +74. (/4) remain 71 5““2' TLL E vi '2; “a “5 ’42“ as '5 -? -- it dzcea‘liah, 6 ‘ And in 0 05' O — ‘ ffdisJ'. Frv‘ms “5 '3) Snacc 2 5.4M 1 A - f cl‘r 0’) ‘ ;. steamy"; WW» “ M m we» pram. fining, “Malia T9 E";€1 9" My.) dOWfi' c. _Suppose the third charge is replaced by a large metal ball with the same charge +2q as shown tn figure (c). Will the magnitude of the electric field at point R increase, or remain the same compared to what it was in part b above? Explain. (increase. 1 112, “mm 6L4” & 9‘” T“ Li“ 7 'AL 6 u,‘)l b2, Mirage "‘ 32¢ ‘5‘ KWK7 pram K) Dlve. TO 71.9193,an 0? 722 Two 05‘ isle. Chg/male“ Dag “Lil rho, {lev‘i c‘r MIN 15”“ Le +2 mt ...
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prac exam 3 - EXAM I GENERAL PHYSICS II SPRING QUARTER 2001...

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