Discussion
Arrange the steps of solving an unsteady state balance in the usual order.
1. state the initial condition
2. choose the system and write the general balance
3. integrate to obtain the time dependence
4. delete the terms that are zero for this case
Answer: A
The initial condition must be stated before integrating, since it fixes the constant that the integration introduces. Deleting terms first keeps the equation as simple as the problem allows. An unnecessary term makes the integration harder.
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