A rigid container equipped with a stirring device contains 2.5

Ben Shaver 2021-12-16 Answered
A rigid container equipped with a stirring device contains 2.5 kg of motor oil. Determine the rate of specific energy increase when heat is transferred to the oil at a rate of 1 W, and 1.5 W of power is applied to the stirring device.
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Expert Answer

otoplilp1
Answered 2021-12-17 Author has 41 answers
Step 1
Given
1) mass of oil m=2.5Kg
2) Heat transfer Q˙=1W
3) Power W˙=1.5W
Required
Determine the rate of specific energy increase
Assumptions
This is a closed system since on mass enters or leaves
Step 2
Solution
We take the oil in the container as our system.The energy balance could be defined as the following
EEout=ΔEsys
Q˙+W˙=ΔE˙˙
The rate of energy increase could be defined as the following
ΔE˙=1+1.5=2.5W
The rate of specific energy increase could be defined as the following
Δe˙=ΔE˙m
Δe˙=2.52.5=1JKg.s

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