WILL RATE 5 Stars What is the rms speed of molecules at 20degreeC? Mass of an O2
ID: 2110602 • Letter: W
Question
WILL RATE 5 Stars
What is the rms speed of molecules at 20degreeC? Mass of an O2 molecules =5.3 times 10-26kg, Boltzmann constant k=1.38 times 10-23J/K A 1.0 kg chunk of ice at -10 degree C is placed in 3.0 kg of water at 20degreeC. The specific heat of ice is 0.50 kcal/kg middot C degree and that of water is 1.00 kcal/kg middot C degree. The heat of fusion of ice is 80 kcal/kg. What is the heat need to raise the temperature of ice chunk from 10degreeC to 0degreeC? What is the heat need to change the ice chunk completely to water at 0degreeC? What will be the final temperature of the ice-water mixture? Ignoring any heat flow to the surroundings, including the container. A heat engine works between a higher temperature heat source and a lower temperature one. If the heat input at the high temperature is 25,000 J and the heat discharged to the lower temperature is 20,000 J, what is the efficiency of the engine? If the two temperatures are respectively 727degreeC and 27degreeC, what would be the maximum efficiency of any heat engine working between these two temperatures? (Celsius to Kevin is +273) One mole of an ideal gas performs an isobaric expansion from a state (P1, V1, T1) to a state (P2, V2, T2). Which of the following is incorrect? (Isobaric = constant pressure; expansion means V2>V1) The work done by the gas isExplanation / Answer
9) Q = m c dT = 1*0.5*10= 5 so B)
10) Q = mL = 1*80 = 80 so B)
11)
maxx energy from water is
3*1*20 = 60
not enough to melt ice so 0 C
so D)
12) e = W/Qh = (Qh-Qc)/Qh = 5000/25000 = 1/5 =0.2 so C)
13)
max e = 1 - Tc/Th = 1 - (273+27)/(273+727)=0.7
14) W = P dV = so C) is wrong since no change in P
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