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# Exam1sec5 - EXA m 1 E166 Zea'7— cotwa ~" 62:15 °...

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Unformatted text preview: EXA m 1 E166 Zea-'7— cotwa - '- ~- " 62:15 ° SLLuTlC-IV _ _.—.._ Grifﬁth Physics 132 Name (WWW? t-lt‘qé/YU‘JT "inf each slat-{on 1. (10 points) A block hangs at rest on a vertical spring at position y = 0. The block has mass 25 grams and the spring constant is 3 N/m. The spring is massless. Praveet pulls the mass down below equilibrium, so that it is at y = - 3.5 cm, then lets go. His lab partner, Asif, starts the stopwatch (ie sets t = 0) when the mass is at y = - 1.0 cm and moving up. Assume that_ the mass is an undampedoscimm. (a) Make a sketch of the situation at t = 0 seconds. Include the +y axis and position of Jug—— the block. - /‘ "” (b) Find the amplitude of the oscillation. Ty“ ’5 O, u 1.5 (c) What is the phase constant? N .. " _/ (d) What is the maximum acceleration of the block? l V: Ah K OL 01. (e) How much kinetic energy does the block have when y = 0? r ‘ l r I l t /, 4(1) How much kinetic energy does the block have when y = -1 cm2 A '5 Ch 0 5 3 “All 52-" __ “-—\_\_‘4( ‘ "' “m ‘ ‘ ' ﬂ —% . , _ _ Pth constant/'15:;— j» 1 (Dr -. ' g \1! (_(::(’§ 2: A 004‘), X 7: 4”“ i v a“ m '3 (Cut cw 54 «ism J : P3 . w — .. \\\ __ C“ :1 Gift KC U/ l 5 »\\\\\u __ \ W, _ , u, - I I f V e, j ’— \\~ £1"; d w [a (6 l ML." , 13 (tiff) FORE/LL“? gel 0 \ It O" IhlltA: . g/PA f ., A \x W _ __ ova/Lil tan L \I may" L“ _ "\\____1__ a ___,-,. K50 a»: Cecil/(ct LK.) a V-m ’ a; (""2— ' ﬂ 7 _. a \- ‘f E : ﬂuﬁﬁ V“ '5 L” r‘ l\ \l' cit-3‘55? Sic, / W'\~ _/ - _ 2. . ' it; C y: (inf? 5 (C). D 5*" ,xrAJ_______________:7;-::= _.. —.»-_/_— —~— — '— -"' ,lifJ-j" .. I , , .\ a, __ V (Mg 3: 21445435 Q'nayh :3 m5; 7 '9; ‘_ \ I 2-— 4,. MILE (£2 : C (Li: 1: " ' {Hg-W:- , \\ V ; : Ugh] i» r5 - : C 5 —— In 9&0 maqk /___,_,_.—a7<-”S‘_'.IJJ_W—\ (Vnsyi I \ : \I/m“:__x we: ’(04‘5‘6 sm(’ IDEMMB \ K 3 z I LB} "m T ; K Y 2 O Se 0 5 So mm o A/ Grifﬁth Physics 132 Name 2. (5 points) The ﬁgure below shows the energy of a harmonic oscillator versus time. The energy is decaying, starting from E = 0.7 Joules at t = 0 seconds. The mass of the oscillator is 2.8 kg. Energy Decay of a Damped Harmonic Oscillator Energy in Joules .0 .0 .0 b 01 O) .0 w .0 m 0.1 o 5 1o 15 20 25 30' Time in seconds (a) What is the time constant for this oscillator? Your answer must be within 5% of the true answer to receive credit. If you use a point or portion of the curve to justify your answer, circle that part of the graph, or clearly draw an arrow to that part of the plot. Charge --; EC 6’ 13/13 O>£i a ,. “l.” ‘ W Li) (b) What is the damping constant of the oscillator? 0C .: '_ S . __ ’ , n1 l/ g l / b / if liq ; 19;? mg ml; m1" W C. Il. r- ‘ - I (JCY.V\Q/(l:q; CA, 1” \x " «Mil L'Lfiii’lig’lﬁml’ ‘- l ) Sou/(710M Grifﬁth Physics 132 Name 5gc . 5 3. (5 points) A 2.0 kHz sound wave travels in air, with speed 340 m/s. (a) What is the wavelength of the sound? (b) What is the phase difference between two points that are 6.5 cm apart, along the direction that the wave is traveling? V\$§ki3 ’F a=i:3._,—L*07S - 9’ f 2000 PH: AX" (a) pt; mm (*7 M = kw l< 3 21' z :21— a. K: vqﬂ‘ _. 4) (5 points) The following is a snapshot graph 'of a wave pulse on a string at time t = 1.0 second. The speed of the pulse is 1 m/s and it is moving to the right. On the axes below, plot a history graph representing the displacement at [email protected]¥ along the string. Label the axes and include a scale and units. If necessary, add or modify the axes to show the wave pulse. D (cm) 0 but {55/ Farm Natal; Q .' ~ '. V‘_ ; " - ‘ I «'l H I 6 (Li L [5/ ‘ 9 (Lt t‘OSI (‘em'li’er bf 156:1) ﬁts) 6 91; an ll its Fmbse NRC. 1 L/V‘A rectal C} t {Lid [1' 2."; Wadi " ...
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Exam1sec5 - EXA m 1 E166 Zea'7— cotwa ~" 62:15 °...

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