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Multiple choice questions on Heat

A house has well-insulated walls. It contains a volume of 100 m^3 of air at 300 K. Calculate the energy required to increase the temperature of this diatomic gas by 2 degree C. Assume it is heating of constant pressure and use Cp = 7R/2.
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Answers:
a) 118 kJ
b) 236 kJ
c) 354 kJ
d) 472 kJ
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A room measure 3.0m by 4.5m by 6.0m. The heating and air conditioning ducts to and from the room are circular with diameter 0.30m, and the air in the room is to be exchanged every 12 minutes. What is the necessary flow speed in the duct? (Assume that the density of the air is constant).
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a) 0.6 m/s
b) 1.6 m/s
c) 3.2 m/s
d) 4.1 m/s
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OTA: please take this problem only if you can show step by step problem solving and equations used. Thank you.

Solution Preview

A house has well-insulated walls. It contains a volume of 100 m^3 of air at 300 K. Calculate the energy required to increase the temperature of this diatomic gas by 2 degree C. Assume it is heating of constant pressure and use Cp = 7R/2.
=================================================
Answers:
a) 118 kJ
b) 236 kJ
c) 354 kJ
d) 472 kJ
################################################

Answer: b) 236 kJ

^ denotes power, * denotes ...

Solution Summary

Answers to Multiple choice questions on Heat

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