What is the function of the commutator in a motor?
2 answers:
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The amount of heat needed to raise the temperature of a substance by 
is given by
where
m is the mass of the substance
Cs is its specific heat capacity
is the increase in temperature
For oxygen, the specific heat capacity is approximately
The variation of temperature for the sample in our problem is
while the mass is m=150 g, so the amount of heat needed is
where
m is the mass of the substance
Cs is its specific heat capacity
For oxygen, the specific heat capacity is approximately
The variation of temperature for the sample in our problem is
while the mass is m=150 g, so the amount of heat needed is