Question

5. Assuming an emissivity, e = 0.85, and an area of
approximately 5.3 m2, find the amount of thermal energy radiated by
the body in 4 hr if the surface temperature is 15.0 0C.

6. Find the amount of thermal energy transferred through a
pine wood door

in 3.00 hr if the door is 0.65 m wide, 1.23 m high, and 40.00
cm thick. The inside temperature of the door is 20.0 0C and the
outside temperature of the door is −20.00 0C. (Kpine door =
1.13*10-1 J/m s 0C)

Answer #1

Find the amount of thermal energy that will flow through a
concrete wall 20.0 m long,1.80 m high, and 12.0 cm wide, in a
period of 24.0 hr, if the inside temperature of the wall is
15.0◦Cand the outside temperature of the wall is 0.00◦C. (For
concrete,k= 1.30 (J/m s◦C).)

4. Efficiency of an engine running between 40 0C and - 20
0C
a. 10%
b. Not a possible engine
c. 150%
d. 19%
5. A copper pipe [ α = 1.7 * 10-5 / 0C] is 30 m long at 23 0C.
What is the change in length of the pipe when a steam of 90 0C pass
through it.
a. 30.1 m
b. 30.4 m
c. 0.034 m
d. 0.301 m
6. Assuming an emissivity, e = 0.2,...

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