Warmup 26: Heat Transfer III

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The first three questions refer to the material you were to read in preparation for the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle. Questions 4 is your opportunity to suggest what we should emphasize today and how.

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1.

Explain what the H, k, A, and L represent in the formula H = kA DT /L.





2.

Explain what R value is. If a brick had a conductivity of 0.8 Watts/m/Co, determine the R value of a brick that is 20 cm thick.




3.

Heating coils are placed in the two cups A and B that are sitting in a room . In order to maintain the temperature inside the cups as shown, each cup must have energy transferred to it at a constant rate. The rate at which heat must be transferred to the cups is best described by:

  1. Cup A will require heat at about twice the rate of B
  2. Cup A will require heat at about five times the rate of B
  3. Cup A will require heat at about the same rate as B
  4. None of the above
  5.  



4. Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):




You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

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