
#1
Apr1707, 07:13 PM

P: 16

1. The problem statement, all variables and given/known data
A cylinder with a piston is filled with ideal gas. The gas temperature is held at 450 K. The cylinder is heated by an oven through a square metal rod connected between the oven and the cylinder. The rod has sides d = 1 cm and length L = 2.3 m. (a) If the oven is held at 750 K, and the heat current conducted through the metal rod is 27 W, find the thermal conductivity of the metal in the rod. k = W/m K 9 NO HELP: H = k*A*(T2T1) / L HELP: H is the heat current; k is thermal conductivity; T2 and T1 are temperatures at two ends; A and L are crosssectional area and length of the rod. 2. Relevant equations H = k*A*(T2T1) / L 3. The attempt at a solution 27=k(.023m^2)(300k)/2.3m k=9 I'm pretty sure im right here... the following quesion asks, For a larger cylinder at 450 K, a heat current of 57 W is needed. If we use the same metal rod to conduct heat, find the oven temperature in Kelvin that will maintain the necessary heat current. and i used the k value 9 and gave me an answer 1083.3, which was the correct answer... 



#2
Apr1807, 01:19 PM

P: 1,017

looks right.



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