PHY
Physics 122 - Exam I solution

# Physics 122 - Exam I solution - 05,1020 1 1 5 points The...

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Unformatted text preview: 05,1020? 1. 1 5 points The organ pipe shown on the picture is 2.75m long. a) What is the frequency of the standing wave shown in the pipe? b) What is the fundamental frequency of this pipe? ”’ :1 l . e: ~.——_--—- : , c: 3/ He ? -“ '4" 1% 2.73 . . . or If?) a 3-.f. ::> FF: {5’— 93/ #2 2. 35 points _ I A lead ball is dropped from rest from a height of 6 m. The collision between the ball and the ground is totally inelastic. Assuming all the ball’s i kinetic energy goes into heating the hailI find its change in temperature. cpb = 128 J/(kg°C) __ F- “a “5 h’ 0 *— JC : 1- rnu 1’ 4% 77%;? gaff/ffth «re/£1” bk! - _—_—_—__—m “5— Z ‘ J gage 9W ff 6/9» ire/W in 3‘0 (Q 1: m6 A / :5 mp6 :9 ﬂip 4’ "' [’79 a” M? :: k 3- c é : 053'02/07 3. 50 points An object of mass m = 5.0 kg hangs from a cord around a light pulley. The length of the cord between the generator and the pulley is L = 2x102 cm. a) When the generator is set to a frequency of 150Hz, a standing wave with six loops is formed. What must be the mass per length of the cord? b) How many loops (if any) will result if m is changed to 45 kg? (Frequency is the same 150 Hz) {find—:45? :23 [:5qu VII-KM T l \‘ QFD ﬂ. #7 (7*l/ jfn‘z A /_SD 52.2 J" _ 2~L f) n V 3‘90 “la/93 05f02r’0'? 4. 50 points A 2.259 bullet embeds itself in a 1.50kg block, which is attached to a spring of force constant 785 Mm. If the maximum compression of the spring is 5.88 cm, find {W W573 V” 2 mb 0.005235“ it b) the time for the bullet-block system to come rest. 1. \$2999 5‘ T i, —— .. :1. ___:__ cg)” - 01 7:05 71, H L} T :~ 0.06% J 5. 50points ice at —10 0C is placed in an isolated container that contains 1x103 9 of water at 30°C. What is the minimum amount of ice at —1 0 OC needed to bring the water temperature down to 2°C? 3 = wows Cw=4186 J!(kg°C) # ‘ ‘ In DMD i ‘ . k ; Cice=2090 J/(kg°C) 0"“ mic" ﬂ c" ( ) 9: +02. +03 ‘9: P : Lr=3.35x105J/kg Ga 2 men ‘14 ) i 05 " mm? ' F 0 MIG!) “(Dr'cp (fa-“LID “A‘mﬁgp "‘f— I Qt; I mu) ’PLL/ 2 I +m.'020w/2'D +mw-ﬂwér3&)=o ‘ Io'mr'eﬁpr'ce. tmiw £6 + OMIT-afge * 69%”th *c’rﬁmw v 6% * £5 '“ - ' " mfg—m, mil? + "QrCDWJ : dgmiau’ﬂw m;c£ : chDMw’pw * W— :032 ./ - * ,__ -‘ . . _3"x05+a?' WcPé ...
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