Recent content by adammw111

Homework Statement Homework Equations H=-k A \frac{\Delta T}{\Delta x} kconcrete = 1.0 W / m K (approx) The Attempt at a Solution H=\frac{-1.0 (8 * 12) (10-20)}{0.23} = 4.17 kW My problem is that the book (Essential University Physics, Wolfson) has the answer as -4.17 kW, but...

I get it now... I was getting confused because the question asked work done on the gas when my formulas are for work done by the gas, and so I used the wrong number/sign in the second part. Your explanation makes sense. Thanks, ehild.

Using \frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2} (ideal gas law): \frac{1.2 \times 10^5 \times 5.0 \times 10^-3}{T_{initial}} = \frac{3.0 \times 10^5 \times 2.0 \times 10^-3}{T_{final}} 600 T_{initial} = 600 T_{final} T_{initial} = T_{final} Therefore as an isothermic process (constant...

Homework Statement 0.21 x 10-3 kmol of ideal gas occupy a volume of 5.0 x 10-3 m3 initially at a pressure of 1.2 x 105 Pa and temperature T. The volume of the gas is first decreased to 2.0 x10-3 m3 at a constant pressure of 1.2 x 105 Pa, and then the pressure is increased to 3.0 x105 Pa...