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Whitepunk [10]
3 years ago
8

A projectile is defined as:

Physics
1 answer:
marin [14]3 years ago
8 0
A projectile is defined as an object that has an initial velocity and follows a path that dependent<span> on the gravitational acceleration.
The gravitational force initially will act on the oposite direction until it reach the maximum height, and right after that, the gravitational force will accelerate the speed of the projectile.</span>
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If you can throw a stone straight up to height h, what’s the maximum horizontal distance you could throw it over level ground?
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The concentration of Biochemical Oxygen Demand (BOD) in a river just downstream of a wastewater treatment plant’s effluent pipe
shtirl [24]

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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)

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t = 50/15 = 3.3333 days

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

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C = 75 e⁻⁰•¹⁶⁷

C = 63.5 mg/L

5 0
2 years ago
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