Heat is transferred by conduction through a wall of thickness 0.87 m. what is the rate of heat transfer if the walls thermal conductivity is 13 w/m-k, the surface area is 5 m2, and the surface temperatures are 14 °c and 93 °c. report your answer in watts.

Explanation:

The given data is as follows.

         Thickness (dx) = 0.87 m,       thermal conductivity (k) = 13 W/m-K

        Surface area (A) = 5 ,      

       

According to Fourier's law,

                    Q =

Hence, putting the given values into the above formula as follows.

                      Q =

                          =

                          = 5902.298 W

Therefore, we can conclude that the rate of heat transfer is 5902.298 W.

Hello!

1.00 L of a gas at STP is compressed to 473 mL. What is the new pressure of gas?

We have the following data:

Vo (initial volume) = 1.00 L  

V (final volume) = 473 mL → 0.473 L  

Po (initial pressure) = 1 atm (pressure exerted by the atmosphere - in STP)  

P (final pressure) = ? (in atm)

We have an isothermal transformation, that is, its temperature remains constant, if the volume of the gas in the container decreases, so its pressure increases. Applying the data to the equation Boyle-Mariotte, we have:

 

The new pressure of the gas is 2.11 atm  

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