How much energy will be consumed by a 400W rice cooker operating for half an hour? a. 12 J b. 24 kJ c. 72 kJ d. 720 kJ

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Chapter20: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 20.12OQ: If a gas is compressed isothermally, which of the following statements is true? (a) Energy is...
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How much energy will be consumed by a 400W rice cooker operating for half an hour?
a. 12 J
b. 24 kJ
c. 72 kJ
d. 720 kJ
8. A metallic key ring is cooled down. Which of the following will happen to the inside
diameter of the key ring?
a. Shrink
b. Expand
c. Stay at the same size
d. None of the above
9. What happens to the internal energy of a gas if increasing temperature under constant
volume?
a. Decrease
b. Increase
c. Do not change
d. Cannot be determined

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