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Svetllana [295]

3 years ago

9

A fluid flows through two horizontal pipes of equal length which are connected together to form a pipe of length 2l. The flow is

laminar and fully developed. The pressure drop for the first pipe is 1.789 times greater than it is for the second pipe. If the diameter of the first pipe is D, determine the diameter of the second pipe.

1 answer:

Alexxx [7]3 years ago

6 0

Answer:

Explanation:

For rate of flow of liquid in a pipe , the formula is

Q = π p r⁴ / 8 η l

where Q is volume of liquid flowing per unit time , p is pressure drop across pipe , r is radius of pipe , η is coefficient of viscosity and l is length of pipe

If η and l are constant for two pipes having equal rate of flow as in the given case

p₁ r₁⁴ = p₂ r₂⁴

p₁ = 1.789 p₂ ( given )

r₁ = D/2

1.789 p₂ x (D/2)⁴ = p₂ x r₂⁴

r₂ = $\frac{D}{2}\times\sqrt[4 ]{1.789}$

2 x r₂ = D x 1.1565

D₂ = D x 1.1565

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The indicated data are of clear understanding for the development of Airy's theory. In optics this phenomenon is described as an optical phenomenon in which The Light, due to its undulatory nature, tends to diffract when it passes through a circular opening.

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$y_{r1} = 1.22\frac{(750*10^{-9})(25*10^{-3})}{2*10^{-3}}$

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3 years ago

Which body systems help these cells get the energy they need?

PSYCHO15rus [73]

I believe there should be some sort of table attached. Unfortunately I cannot answer this question. Sorry!

5 0

3 years ago

PLEASE HELP!!!!

defon

Answer:

v = 2.45 m/s

Explanation:

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h = Vi t + (1/2)gt²

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t = √3.06 s²

t = 1.75 s

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s = vt

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s = horizontal distance covered = 4.3 m

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8 0

3 years ago

The current theory of the structure of the

IRISSAK [1]

1) The mass of the continent is $3.3\cdot 10^{21} kg$

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3) The speed of the jogger must be 4 m/s

Explanation:

1)

We start by finding the volume of the continent. We have:

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$m=dV=(2750)(1.20\cdot 10^{18})=3.3\cdot 10^{21} kg$

2)

The kinetic energy of the continent is given by:

$K=\frac{1}{2}mv^2$

where

$m=3.3\cdot 10^{21} kg$ is its mass

v = 3.2 cm/year is the speed

We have to convert the speed into m/s. We have:

3.2 cm = 0.032 m

$1 year = 1(365)(24)(60)(60)=3.15\cdot 10^7 s$

So, the speed is:

$v=\frac{0.032 m}{3.15 \cdot 10^7 s}=1.02\cdot 10^{-9} m/s$

So, we can now find the kinetic energy:

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3)

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m = 78 kg

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K = 624 J

The kinetic energy of the jogger is given by

$K=\frac{1}{2}mv^2$

where v is the speed of the jogger.

Solving for v, we find the speed that the jogger must have:

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Learn more about kinetic energy:

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3 years ago

Pressure is about 1000 hPa at sea level and about 500 hPa at an altitude of 5.5 km. Why doesn’t this vertical pressure gradient

saul85 [17]

Answer:

A. The upward pressure gradient force is balanced by gravity.

Explanation:

A. is correct because the pressure difference is actually generated by gravity. As in the following formula for the pressure at different points:

$p = p_0 + \rho g h$

where $p, p_0$ are the pressure at 2 points, ρ is the density of the fluid, g is the gravitational constant, and h is the height difference.

B is incorrect because friction in air is too small to make an effect.

C is incorrect because the Coriolis force is horizontal, not vertical.

D is incorrect because a difference of 500 hPa = 50000 Pa, this is half of the atmospheric pressure.

E is incorrect because temperature cannot generate force.

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3 years ago