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AnnZ [28]
4 years ago
9

A 1/4th scale car is to be tested in a wind tunnel. If the full scale speed of the car is 30m/s, what should be the wind tunnel

speed for Reynolds number similarity a) 30m/s b) 6m/s c) 7.5m/s d) 150m/s e) 120m/s
Engineering
1 answer:
Studentka2010 [4]4 years ago
7 0

Answer:

e)v=120 m/s

Explanation:

Given that

Scale ratio = 1/4

Speed of car =30 m/s

lets wind tunnel speed is v

We know that Reynolds number given as

Re=\dfrac{\rho\ L\ V}{\mu }

If all conditions taken as similar then

(L\ V)_c=(L\ V)_w

Given that

\dfrac{L_w}{L_c}=\dfrac{1}{4}

So we can say that

4 x 30 = v x 1

v=120 m/s

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3 years ago
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Technician A is correct hope this helps
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3 years ago
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She should create a computer animated view of the design to walk the client through it so that client will understand and get the picture of the design.
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A budding electronics hobbyist wants to make a simple 1.0-nF capacitor for tuning her crystal radio, using two sheets of aluminu
bazaltina [42]

Answer:

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b. Area of Aluminum Foil needed = 0.45m²

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Explanation:

a.

First, we need to calculate the distance between two plates.

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d = Kε0A/C

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So, d = (3 * 8.854 * 10^-12 C²/Nm² * 0.0616) / (1 * 10^-12F)

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N = d/d,sheet where d, sheet =the sheet thickness = 0.2mm

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b.

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Well make use of the formula in (a) above

Using d = Kε0A/C

Where

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Other constraints remain unchanged

Make A the subject of formula

A = dC/Kε0

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c. From (b) above

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As the dielectric constant increase, the area decreases

The dielectric constant of a Teflon is 2.1

This means that if she used a Teflon instead, the area will be larger.

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4 years ago
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Answer:

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4 0
3 years ago
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