a rigid container equipped with a stirring device contains 0.5 kg of motor oil. determine the rate of internal energy increase per unit mass when heat is transferred to the oil at a rate of 1.5 w, and 2 w of power is applied to the stirring device.
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The rate of internal energy increase is 7 W/kg.
According to the first law of thermodynamics, the total energy of the system is always conserved.
Mathematically it is written as
Q=ΔU+W
Plugging the values in the above equation
1.5=ΔU+(-2) here negative sign is used because power supplied to the system is negative
ΔU=3.5 W
Therefore rate of internal energy increase of the system is 3.5 W
Now we will calculate the increase in internal energy per unit mass
u=ΔU/m=3.5/0.5=7 W/kg
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