3 years ago

Someone help pleaseeee

Physics

1 answer:

SSSSS [86.1K]3 years ago

5 0

Answer:

C. resonating

an object being forced to vibrate at its natural frequency creates resonance

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Solution :

Given :

Rectangular wingspan

Length,L = 17.5 m

Chord, c = 3 m

Free stream velocity of flow, $V_{\infty}$ = 200 m/s

Given that the flow is laminar.

$Re_L=\frac{\rho V L}{\mu _{\infty}}$

$=\frac{1.225 \times 200 \times 3}{1.789 \times 10^{-5}}$

$= 4.10 \times 10^7$

So boundary layer thickness,

$\delta_{L} = \frac{5.2 L}{\sqrt{Re_L}}$

$\delta_{L} = \frac{5.2 \times 3}{\sqrt{4.1 \times 10^7}}$

= 0.0024 m

The dynamic pressure, $q_{\infty} =\frac{1}{2} \rho V^2_{\infty}$

$=\frac{1}{2} \times 1.225 \times 200^2$

$=2.45 \times 10^4 \ N/m^2$

The skin friction drag co-efficient is given by

$C_f = \frac{1.328}{\sqrt{Re_L}}$

$=\frac{1.328}{\sqrt{4.1 \times 10^7}}$

= 0.00021

$D_{skinfriction} = \frac{1}{2} \rho V^2_{\infty}S C_f$

$=\frac{1}{2} \times 1.225 \times 200^2 \times 17.5 \times 3 \times 0.00021$

= 270 N

Therefore the net drag = 270 x 2

= 540 N

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3 years ago

True or False. Alfred Wegener contributed greatly to the theory of plate tectonics by collecting and analyzing fossil, glacial a

bearhunter [10]

Answer:

The Answer would be True

Explanation:

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2 years ago

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A 7.99 g sample of hcn is found to contain 0.296 g of h and 4.14 g of n.Find the mass of carbon in a sample of hcn with a mass o

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<u>Answer:</u>

Mass of C in 3.40 g of HCN =1.51 gram.

<u>Explanation:</u>

Mass of sample of HCN = 7.99 g

Mass of H in 7.99 g of HCN = 0.296 g

Mass of N in 7.99 g of HCN = 4.14 g

Mass of C in 7.99 g of HCN = (7.99-0.296-4.14) = 3.554 g

Now mass of HCN = 3.40 g

Mass of C in 3.40 g of HCN = $\frac{3.554}{7.99} *3.40 =1.51 g$

So mass of C in 3.40 g of HCN =1.51 gram.

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