{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

p344mt1s

# p344mt1s - Name\1 Student ID Physics 344 — Mid-term 1...

This preview shows pages 1–4. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Name: \1 Student ID#: Physics 344 — Mid-term 1 February 6, 2009 1(15marks). The Stirling cycle of an ideal gas, shown in the ﬁgure below, consists of four quasistatic processes. The steps a9]; and 0 9d are isothermal processes at temperatures T1 and T2 respectively; the steps b 9c and d -)a are isochoric processes. Pa=1.0MPa, Va=1.0><10'3m’, Vb=2.0><]0‘3m3, T,=500K, T2=300K (a) Calculate the heat (Q1) input to the ideal gas in process a 91); (b) Calculate the work (W2) done on the ideal gas in process c 9d; 2 (c) Show that in general the efﬁciency n=W’/Q. is equal 3 to l-Tz/T 1, where W' is the total work done by the ideal 5 gas in a cycle. b _ a! V (a). le—Wt C SPOU/ ‘B‘I/AJT V at b = [A V“ V‘ VON Volume - 2 2 [O 6X / 0 3 4/“ ““" : €73 J- (b). wz=~gpotv c—vol J :-NR'I;S,_|Z c VJ u’A/QTI lea-i}: - Via -“NKMTI M”— ' T. j Vb \/ 2+ Pal/“'13 jut-r;- Tl 0‘ (0 Term, Wk 0M 9M W:V\/\+W1 V v I “Pal/MIMVE Big-Ii]; : Fave/mg: lﬁ—l) W/="W = Pat/ j M, .3 m “17;“ 7‘?) / I . w 1; 4/. -. E2Q—zﬁ)Pal/AJPIAT/Z Vat/t at? A / .‘ , yzt’ T2 - a, Q\ T‘. Name: Student ID#: 2(15,m,ks). A vessel of volume 0.002m3containing 2 moles of monatomic ideal gas at 300K is connected by a closed valve to a long cylinder containing a frictionless, leak-free piston. The weight of the piston, plus the weight of the load it supports, is 4000N and the area of the piston is 0 Olmz. Atmospheric pressure is lOOkPa. The valve [5 opened and the gas is slowly admitted to the cylinder The system eventually reaches a new equilibrium state at 300K. (a) Determine the height to which the piston is raised. (b) Determine the work done on the gas (W) and the heat input (Q) (c) Would the answer to part (b) change if the valve was fully opened and the gas was quickly admitted to the cylinder? Explain brieﬂy. ﬁWWVR‘C} V4: NET; : 7-“:‘3’XZ’O =977stm3 = Viv/95, xw s f1 V‘f—l/L' __ 0.00797‘0v002 : 0,79] m x 0.80M. " A 010/ .. :—~ -(/,')="PA£. 1b). W="S ﬁlm :~ jﬁdu __74A\/ (7%ch f MI; w M1 : ~ ELAﬁ2x10rxoo/xo7772"3'77 K3" Au :0 0 (Start T" :7.“ I ,‘Jm/ﬁﬁ‘) (Q = —- w: 3 99 (<5 by Qxﬁynﬂ/ 7Z0’Te (d) . No Begun ’49 ”Wk done 0’13“ 9 j £67 749 ‘ «Few-Ah WA?“ Vext 1'5 defermim' WAcT/ifr 67 no“!‘ 7‘49 {Zﬂ‘t’w ('5 “‘1 elm/éi-WIM (9M) Name: Student ID#: 3(10marks). For the quasistatic process aéb of an ideal monatomic gas, SZ=NT, N=1.0mol, Ta=100K, Tb=4OOK. (a) Calculate the heat input to the system; (b) Calculate the work done on the system. Name: Student |D#: 4 (10marks). A vessel of volume 0.04m3 contains liquid water and steam in equilibrium at 200°C. The mass of water in the liquid phase is 2.0kg. 3 VW" w=m°cw=zkl (a) Determine the mass in the vapour phase; (b) If the system is cooled down to 100°C, calculate the heat losi (a). megzeo [<3 ' 7:2,»"6 Me 4& 4- M4, u, = l/ z-ox I‘léxw's—I- My (0 .13) = 0'0?- o.oq. -p.oaz,}2 .. k m »‘ m : , 0.2 a 30/09 f0? v V 0.]; 7 ; (l7), Toﬁ/ "“5.- ”77' = 2.0 +0.27 =2-27 [43, . at Ioo°C : l/ = mm, + My (4, 2mm, + (Mr-”UM, 0.090 = m! (M “(03) 4- (2.27— me)x ll? ”7‘ = ‘ﬁlnromtf- :23] £3 [-8- 0-00 /o¢ my ’-‘-' 2.1? -z.27 :: 0.02 K? 111.22 xoyr +0.27x2~6 :7 24—? ”3‘ . t .' a .07 ”I (41°C ; ”ff 2 2.27an + o-ozxzs / . A“ 1: /[email protected]~ Z‘V-J’ :2 "/41” MI : . MJ‘) -_ ‘ IVU (Hal lo}! [‘4’ [“20 Q = b” ’ [45‘ , Total \/ 0W ‘2 0R I‘S/I!’((‘f|\( VOIUC 2 U1— 2 :7”: : W204) {747 M //(j Au 2 0“}; ~Iuof 1‘ ~ 0.67— M‘s/[(3 AH -:-. m1- -Al,l = 2-27x(-0v‘Z/=—/.¢z ”%2 =52 ...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern