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Home Q & A Board Science-Related Homework Help Physics Astronomy
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ilan707 ilan707
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6 years ago
What is the ratio of the speed of sound in air at 0C to the speed at 100 C?
 
  What will be an ideal response?

Question 2

A coal-fired plant generates 600 MW of electric power. The plant uses 4.8  106 kg of coal each day. The heat of combustion of coal is 3.3  107 J/kg.
 
  The steam that drives the turbines is at a temperature of 300C, and the exhaust water is at 37C.
  (a) What is the overall efficiency of the plant for generating electric power?
  (b) What is the Carnot efficiency?

Question 3

How many moles are there in 2.0 kg of copper? (The atomic weight of copper is 63.5 and its specific gravity is 8.9.)
 
  What will be an ideal response?

Question 4

Consider a light bulb, in empty space, radiating 200. watts with its filament heated to 2800.C. Assuming it is a good approximation to a black body.
 
  (a) What is the area of the filament?
  (b) If placed in an oven, with walls at 800.C, what is its net power radiated now?
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HoepforbuddhaHoepforbuddha
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6 years ago
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ilan707 Author
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6 years ago
Appreciate the effort you put into answering, thank you!
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#3
6 years ago
You're very welcome
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