Temperature inside a house is kept equal to 20 degree C. Temperature outside is

Question

Temperature inside a house is kept equal to 20 degree C. Temperature outside is 10 degree C What about the rate of heat outflow across the walls if temperature outside decreases to 0 degree C. rises two times decreases two times rises four times decreases four times there is no impact on heat flow rate An ideal gas expands from 1.0 m^3 to 3.0 m^2 at atmospheric pressure while absorbing 50 times 10^5 J of heat in the process. The temperature of the system increases, stays the same or decreases? What is the work done by the gas? A rigid container contains 1 mol of ideal gas that slowly receives 10 kJ of heat. What is the change in the internal energy of the gas? 600 g of water at 15 degree C was mixed with 400g of water at 45 degree C. What is the final temperature of water if no heat is lost? Calculate amount of molecules in 54 g of water Write second law of thermodynamics.

Explanation / Answer

10.

Suppose the equilibrium temperature is T,

Energy gain = energy released

E1 = E2

m1*Cp*dT1 = m2*Cp*dT2

m1 = 600 gm = 0.6 kg

dT1 = T - 15

m2 = 400 gm = 0.4 kg

dT2 = 45 - T

0.6*(T - 15) = 0.4*(45 - T)

T = 18 + 9

T = 27 C

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