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Final_Part_2_SU09

# Final_Part_2_SU09 - Physics 8A Summer 2009 Final Exam Part...

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Unformatted text preview: Physics 8A Summer 2009 Final Exam Part 2 1. (10 pts) A string is vibrating as shown in the diagram. The ﬁ'equency of vibration is 550 Hz, W! the tension is 1250 N, and the mass of the string \W/ \v/ is 4.0 g. Find the length of the string. 2. (15 pts) A bat ﬂies toward a wall, emitting a steady sound of frequency 23.0 kHz. The sound from the bat reﬂects off a wall, and back to the bat, so that the bat hears a beat frequency of 150 Hz. What is the speed of the bat? Take the speed of sound to be 344 m/s. 3. (10 pts) An ideal polyatomic gas sample has a volume of 3.0 m3, a pressure of 1.50 atm, and a temperature of 20° C. It is then compressed rapidly, so that no heat is exchanged between the gas and its environment. After the compression, its temperature is now 90° C. Find the pressure and volume of the gas. 4. (15 pts) A 3.00 mol sample of an ideal diatomic gas goes through the cycle shown in the diagram. At point A, the gas is at a pressure of 1.10 atm, and the temperature is 310 K. At point B, the gas pressure is 1.80 atm, and the temperature is 750 K. The process from A to B is a straight line. In the process from B to C, the gas is isothermally expanded. Finally, the process from C to A occurs at constant pressure. Find the heat absorbed by the gas during each part of the cycle. Note: It may be useful to calculate the volume at one or more points. Also, the value of the universal gas constant R is 8.31 J/mol'K, and 1 atm = 1.01 x 10 Pa. ‘0 L71“; \$34 JOLUTw/w Tb Fm“ EiA-MV ﬂy..." um 7 E2211}. 41( gay-Litaazaﬂgr U’ 7" ”VA U- T?" 1 :7; \$21. 2 1+ ML 0" f: .. (iii ”ml. ’ V" PT In L a L .2 t (E) n ,3 Lemma mm, an, 35“"‘ﬂvvle/ \ llWM [ 3> \ ‘1’ Owed/g; L(S‘K‘DH;J : MU} , (2.0'Dhrd)(&.?lT/holv‘t‘(3‘0k)> W... fog. [.10 M.ahc(o‘\l°q = 0,05% m3 Va 2 “k“; ; (Rao'mntm. V/ml.zgihrum PR [J‘Uv—Loluorpg . 3’ 1': 30‘ [03 m w "‘ Jg (mo +1.3—om‘m a.omo'°‘”‘/cm(o.lol J-U. 067“” “ Him)?“ 6? : 1-7HL109T #98909“? 332311093‘ RIB-‘7C\ Q T W = hRTA [.912 = (10 Numb 3:37ha:.ar)(’lmm,L,\ ”‘0 pf— [Jo " ’ qllo 3" FUW'C-QAN : 31:0,“, Mugm : T/Mal- m [am «< —~ 75*» k7 : ~2.M+/a“T ...
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Final_Part_2_SU09 - Physics 8A Summer 2009 Final Exam Part...

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