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Nikolay [14]
3 years ago
12

A research student wants to know whether ethanol is a better fuel than gasoline. Which step in the process of scientific inquiry

has already been completed?
Physics
2 answers:
DerKrebs [107]3 years ago
4 0

Answer:

Asking a scientific question

Explanation:

tigry1 [53]3 years ago
3 0

Answer:

Asking a scientific question

Explanation:

Scientific inquiry is using evidence from observations and investigations to create logical explanations and answer questions. Scientific inquiry is for people who want to be challenged and use creative and critical thinking to answer questions related to science.

The scientific method has five basic steps;

1. Ask a Question (just like the research student asking which is a better fuel between ethanol and gasoline)

2. Do Background Research

3. Construct a Hypothesis

4. Test Your Hypothesis by Doing an Experiment

5. Analyze Your Data and Draw a Conclusion

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Answer:

The BOD concentration 50 km downstream when the velocity of the river is 15 km/day is 63.5 mg/L

Explanation:

Let the initial concentration of the BOD = C₀

Concentration of BOD at any time or point = C

dC/dt = - KC

∫ dC/C = -k ∫ dt

Integrating the left hand side from C₀ to C and the right hand side from 0 to t

In (C/C₀) = -kt + b (b = constant of integration)

At t = 0, C = C₀

In 1 = 0 + b

b = 0

In (C/C₀) = - kt

(C/C₀) = e⁻ᵏᵗ

C = C₀ e⁻ᵏᵗ

C₀ = 75 mg/L

k = 0.05 /day

C = 75 e⁻⁰•⁰⁵ᵗ

So, we need the BOD concentration 50 km downstream when the velocity of the river is 15 km/day

We calculate how many days it takes the river to reach 50 km downstream

Velocity = (displacement/time)

15 = 50/t

t = 50/15 = 3.3333 days

So, we need the C that corresponds to t = 3.3333 days

C = 75 e⁻⁰•⁰⁵ᵗ

0.05 t = 0.05 × 3.333 = 0.167

C = 75 e⁻⁰•¹⁶⁷

C = 63.5 mg/L

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