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midterm2solutions

midterm2solutions - Problem 4 o§1 0-2 0.3 04 0:5 0:6...

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Unformatted text preview: Problem 4 o§1 0-2 0.3 04 0:5 0:6 Time (seconds) 0.5 i 1.5 2 25 3 Distance (meters) a) For the wave shown above, what is the wavelength? (5pts) 2 M b) What is the frequency? (Spts) Tz-VML ‘3 i734 ll 4 l—~ u 9.) Ln 2: a: c) What is the wave speed? (Spts) VsM = 3-35 : 5 “/4 d) Who; is the amplitude? (Spts) L/ e) The speed of sound in air is 340m/s. The speed of sound in water is 1500 mfs. The Spwd of sound in steel is 5,100 mfs. If the middle-C note is played in each of these mediums in which medium will the sound have the longest Wavelength? (Spts) v=kf R cgnifflhf [a as” 4|“!ij é) I/lt'jkch Spa! 6‘ 9M4 MW cwflsp’I-d 1" 1°55”? WQ-ijt“ :3) steel Problem 3 The diagram below shows the heat required to change the phase and temperature of 1 gram of some unknown substance. All of the. questions below concern this unknown matelial. :1) Clearly label the region(.s) on the diagram above which represent latent heat. (6 pts) b) How much heat is released into the environment when 4 grams of 130°C gas-cools into 4 grams of 30°C solid? (7pts) .Car l fire-w. I‘m" at; -5 (30' “1*"! '. Sou (“I 130" (elm?! -” 30‘ [gm-1 -' ?0 (4 30" (1“,; a 30' 3.1;} -' + Z no a! 740 {d {9r '~{ (Iran): 770w: 3| 50 wt 6) What is the specific heat of this substance? (6pts) Q: hasch g...“ 51mph: got-I) {H.- T:= 3’1 LL ErlSO'C {7J2} 40 (All fir 1 6rd.“ =2) lip: l'c -(Is.-s.) ‘Io= ch») = O. C “$0; 61) 180 calories are needed to heat 0g of liquid from 70°C to some final temperature. What is this final temperature? (opts) Q?- kcAT I90 = Io'.‘r(Tr7°) 190 = af(Tf—-'lo) 3”: Eli—'70 DWO'C Problem 2: There are two blocks each with a volume of 2 m3. 3 One block IS made of wood and has a density of 400 kg/ma, while the other block 18 made of metal and has a density of 3000 light:3 The density of water is 1000 [cg/1113. a) What is the mass of the wood block? What is the mas-s of the metal block? (opts) .. ‘2. S" V M ”13011: HOD-.2- ‘1‘. mail 30'- : :2 W1: ?00l(3 MA: Co-aKg b) When the metal block is held so that the upper surface of the block is 6131 under water, what is the gauge pressure at the upper surface of the block? (opts) l)?” fit-11 31" c) When the wood block is held so that the upper surface of the block is 5131 under water, what is the buoyant force acting on the block? Opts) F3: Eng-4:? V‘W Eldon-10‘ 'z. 7 9-”)0“N d) If the blocks were released While under water; the wood block would float, while the metal block would sink, Why? (6 pts) Tke no lec 13 w A»: {10. we, 5- gm, Wag—- TIM Wm Hue. :3 More An «In La- ..‘ - i K [a {Y 5 Fly? E Fa Problem 1: Short Answers. Please provide a short 311sz to the following questions: 11) Draw an example of two. waves interfering constructively. Be sure to indicate the amplitudes before and after the interference. (4pts) 13) Two twins with identical masses are in a life raft. One twin is standing and the other. is. lying down. Whieh twin exerts more force on the raft? Which twin exerts more pressure? (4pm) Th1 Li-L exert 1‘}: saw: 18mg. {56% Mars.) The steam} {mm and; and assure, (gs-(f, am] 0) Which of the following processes involve a decrease in entropy within a material: melting, freezing, evaporation, condensation? (4pts) ME"?! fled M143“ (1) Why is mercury a better material than water to use in a thermometer? (4pts) kaffiafl‘ffen WELI vi '5“: 19,1 {144(- msi Mia-":15 expand a; {11.7 {'(MP-Zfflb/{f “Cf-”(‘55. Lima! wafer waffué SL'jLVfl’ '69-». 0'C I!“ Y'( ‘33 ii. l-JDJU lit-pf k flaky“! 4r “5-C- in a thumW-F&_ e) A gas is contained in a sealed, metal box'that cannot change its volume. What happens to the pressure inside the box as the gas is cooled toward absolute zero? (4pts) T1“— ?“SSM Jame-c a” ‘PP-“d‘tr aw- ?“ .r 331’: ”has v a moat. Ti T1 1) When you are driving in a small car on the freeway and a truck passes you, will you feel pulled toward the truck or away from the truck? Why? (Spts) Y0“ ”i“ 'p‘l/i tit/{(4 five-'45 111-: W Th Mawzaa flukt WW; ILL-e air drywall it) So I-JIN’... I1? P456, W WU 4K (CI/5b ?flJ5—(A L] {mi WW"? fiir- rifled}; {‘3mein (KIA-High) {1,1 1gp, “4.9:? a”. (in 41-1 law: £15.11: 74¢) MN '31 at a. iov-W" twee-Fe. ...
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