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Tutor profile: Noshin K.

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Noshin K.
Recent Environmental Engineering Graduate from the University of Michigan
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Questions

Subject: Spanish

TutorMe
Question:

In what contexts are $$ ser $$ and $$ estar $$ used?

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Noshin K.
Answer:

$$ser$$ is used when referring to the date, an occupation, characteristics, time, origin, and relation $$estar$$ is used when referring to position, location, action, condition, and emotion

Subject: Environmental Engineering

TutorMe
Question:

A reactor at a drinking water plant has two inputs with the following flowrates and concentrations of chloride: Input 1: flowrate = $$1 m^3/s$$ chloride concentration = $$15.0 mg/L$$ Input 2: flowrate = $$3 m^3/s$$ chloride concentration = $$50 mg/L$$ Assume chloride is a conservative substance, the reactor volume does not change, and the reactor is well-mixed. Find the chloride concentration in the single output leaving the reactor.

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Noshin K.
Answer:

Assumptions: steady state well mixed - completely mixed-flow reactor --> $$ C_(reactor) = C_(out) $$ $$ dV/dt = dM/dt = 0 $$ conservative (no reaction) --> $$ rV = 0 $$ $$ dV/dt = Q_1 + Q_2 - Q_(out) = 0 $$ $$Q_1 = 1 m^3/s $$ $$Q_2 = 3 m^3/s $$ $$ Q_1 + Q_2 = Q_(out) = 4 m^3/s $$ $$ dM/dt = QC_(in) - QC_(out) + rV $$ $$ rV = 0 $$ $$ dM/dt = 0 $$ $$ dM/dt = Q_1C_1 + Q_2C_2 - Q_(out)C_(out) = 0$$ $$C_1 = 15.0mg/L$$ $$C_2 = 50 mg/L$$ $$ C_(out) = (Q_1C_1 + Q_2C_2)/Q_(out) $$ $$ C_(out) = 41.25 mg/L$$ one significant figure -- $$ C_(out) = 40 mg/L $$

Subject: Algebra

TutorMe
Question:

Given the equation $$ 8 + 5t = 9t - 12 $$ Solve for $$ t $$

Inactive
Noshin K.
Answer:

$$ 8 + 5t = 9t - 12 $$ $$ 20 + 5t = 9t $$ $$ 20 = 4t $$ $$ t = 5 $$

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