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Olin [163]
3 years ago
8

Water flows at a uniform velocity of 3 m/s into a nozzle that reduces the diameter from 10 cm to 2 cm. Calculate the water’s vel

ocity leaving the nozzle and the flow rate.

Engineering
1 answer:
katrin2010 [14]3 years ago
4 0

Answer:

See the pictures attached

Explanation:

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What is the difference between the pressure head at the end of a 150m long pipe of diameter 1m coming from the bottom of a reser
uysha [10]

Answer:

\frac {p_2- p_1}{\rho g} = 31.06 m

Explanation:

from bernoulli's theorem we have

\frac{p_1}{\rho g} + \frac{v_1^{2}}{2g} +z_1 = \frac{p_2}{\rho g} + \frac{v_2^{2}}{2g} +z_2  + h_f

we need to find pressure head difference i.e.

\frac {p_2- p_1}{\rho g} = (z_1 - z_2) - h_f

where h_f id head loss

h_f = \frac{flv^{2}}{D 2g}

velocity v =\frac{1}{n} * R^{2/3} S^{2/3}

S = \frac{\delta h}{L} = \frac{40}{150} = 0.267

hydraulic mean radius R =\frac{A}{P} = \frac{hw}{2h+w}

R = \frac{40*1}{2*40+1} = 0.493 m

so velocity is  =\frac{1}{0.013} * 0.493^{2/3} 0.267^{1/2}

v = 24.80 m/s

head loss

h_f = \frac{0.0019*150*24.80^{2}}{1* 2*9.81}

h_f  =8.93 m

pressure difference is

\frac {p_2- p_1}{\rho g} = 40 - 8.93 = 31.06 m

\frac {p_2- p_1}{\rho g} = 31.06 m

4 0
3 years ago
View the picture below and then correctly answer the questions using the following words: Temperate Zone, Tropical Zone, Polar Z
Nadusha1986 [10]

Can you provide the picture? Thanks !

8 0
3 years ago
Read 2 more answers
Cómo se llama el componente, que permite abrir o cerrar un circuito eléctrico
Korolek [52]
Creo haber leído sobre esto..Un “interruptor” yo diría
5 0
3 years ago
If you want to obtain a Class E license before you turn 18, you must______. A. be in compliance with school attendance requireme
Makovka662 [10]

Answer:

The correct option is;

A. be in compliance with school attendance requirements

Explanation:

The requirements to acquire a special restricted driver's license for driver's license for under under 18 that have had a beginner's for up to 180 days include a minimum of 40 hours driving practice 10 of which should be in the dark. The application for the conditional drivers license is to be signed by the parent or guardian and the application is to be accompanied with proof of acceptable school attendance

At 17, after holding the special restricted drivers licence for a year without issues you can obtain the full drivers license.

7 0
3 years ago
The fracture strength of glass may be increased by etching away a thin surface layer. It is believed that the etching may alter
Korvikt [17]

Answer:

the ratio of the etched to the original crack tip radius is 30.24

Explanation:

Given the data in the question;

we determine the initial fracture stress using the following expression;

(σf)₁ = 2(σ₀)₁ [ α₁/(p_t)₁ ]^{1/2 ----- let this be equation 1

where; (σ₀)₁ is the initial fracture strength

(p_t)₁ is the original crack tip radius

α₁ is the original crack length.

first, we determine the final crack length;

α₂ = α₁ - 16% of α₁

α₂ = α₁ - ( 0.16 × α₁)

α₂ = α₁ - 0.16α₁

α₂ = 0.84α₁

next, we calculate the final fracture stress;

the fracture strength is increased by a factor of 6;

(σ₀)₂ = 6( σ₀ )₁

Now, expression for the final fracture stress

(σf)₂ = 2(σ₀)₂ [ α₂/(p_t)₂ ]^{1/2 ------- let this be equation 2

where (p_t)₂ is the etched crack tip radius

value of fracture stress of glass is constant

Now, we substitute 2(σ₀)₁ [ α₁/(p_t)₁ ]^{1/2 from equation for (σf)₂  in equation 2.

0.84α₁ for α₂.

6( σ₀ )₁ for (σ₀)₂.

∴

2(σ₀)₁ [ α₁/(p_t)₁ ]^{1/2  = 2(6( σ₀ )₁) [ 0.84α₁/(p_t)₂ ]^{1/2  

divide both sides by 2(σ₀)₁

[ α₁/(p_t)₁ ]^{1/2  =  6 [ 0.84α₁/(p_t)₂ ]^{1/2

[ 1/(p_t)₁ ]^{1/2  =  6 [ 0.84/(p_t)₂ ]^{1/2

[ 1/(p_t)₁ ]  =  36 [ 0.84/(p_t)₂ ]

1 / (p_t)₁ = 30.24 / (p_t)₂

(p_t)₂ = 30.24(p_t)₁

(p_t)₂/(p_t)₁ = 30.24

Therefore, the ratio of the etched to the original crack tip radius is 30.24

6 0
3 years ago
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