Giancoli 5th Ed.

Hwk 12  (Due 5/10/24)        10 point hwk
Ch. 19 

MisConQ. 7, 10-13

Problems: 
Ch. 19 P. 1,6,8,9,30,32,33,35,36,40,49  < no!
       P. 1,6,8,9,20,21,32,33,35,36,40,49 < actually assigned

MisConQ
7. d
10. d
11. d
12. b
13. c

Problems
1. Delta T = Q/mc =0.54.  So Tf = 10+0.54 = 10.54 C.
6. m = Q/c(Delta T)    250 kg in 1 hr.
8. Q = mc(Delta T)  =  6.0x10^6 J
9. c = Q/m(Delta T) = 2100 J/(kg C)
20. Q = mL_v so m=Q/Lv = 1.6 kg
21. Q=Qh + Qmelt = mcDT + mLf = 8.0x10^6 J.
32. a) Delta E_int = 0
    b) Q = Delta E + W = 4.3E+3 J
33. Draw a P vs V graph showing two processes.
    Process A is an isobaric compression.  Process B is an isothermal expansion.
35. a) The work done at constant pressure is W = P(Delta V)
       W = 1.9E+5 J
    b) Delta E_int = Q-W = 4.9E+5 J
    c) Graph of P vs V shows horizontal (isobaric expansion) process at P=1 atm
       with volume increasing from 2.2 to 4.2 m^3.
36. a) W = P(Delta V) = 0 J
    b) Delta E_int = Q-W = -425 kJ.
40. a) W = nRTln(V2/V1) = 5440 J
    b) Delta E_int = Q-W = 0 (isothermal), so Q=W = 5440 J
    c) Delta E_int = 0
49. E_int = 7/2 nRT (seven d.o.f.) = 3.85E+5 J

[ 30. Set KE_bullet = Q = mc(Delta T) + mL,   m_ice = 5.2E-3 kg or 5.2 g ]


Please check    
Prob.  (1pt),   (1pt)            Tot= 10 pts
MisConQ.  --- (0.5 pt each)