1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zaharov [31]
3 years ago
9

Water flows through a horizontal 60 mm diameter galvanized iron pipe at a rate of 0.02 m3/s. If the pressure drop is 135 kPa per

10 m of pipe, do you think this pipe is
a) a new pipe,
b) an old pipe with somewhat increased roughness due to aging or
c) a very old pipe that is partially clogged by deposits. Justify your answer.
Engineering
1 answer:
maksim [4K]3 years ago
5 0

Answer:

pipe is old one with increased roughness

Explanation:

discharge is given as

V =\frac{Q}{A} = \frac{ 0.02}{\pi \4 \times (60\times 10^{-3})^2}

V = 7.07  m/s

from bernou;ii's theorem we have

\frac{p_1}{\gamma}  +\frac{V_1^2}{2g} + z_1 = \frac{p_2}{\gamma}  +\frac{V_2^2}{2g} + z_2 + h_l

as we know pipe is horizontal and with constant velocity so we have

\frac{P_1}{\gamma } + \frac{P_2 {\gamma } + \frac{flv^2}{2gD}

P_1 -P_2 = \frac{flv^2}{2gD} \times \gamma

135 \times 10^3 = \frac{f \times 10\times 7.07^2}{2\times 9.81 \times 60 \times 10^{-5}} \times 1000 \times 9.81

solving for friction factor f

f = 0.0324

fro galvanized iron pipe we have \epsilon  = 0.15 mm

\frac{\epsilon}{d} = \frac{0.15}{60} = 0.0025

reynold number is

Re =\frac{Vd}{\nu} = \frac{7.07 \times 60\times 10^{-3}}{1.12\times 10^{-6}}

Re = 378750

from moody chart

For Re = 378750 and \frac{\epsilon}{d} = 0.0025

f_{new} = 0.025

therefore new friction factor is less than old friction factoer hence pipe is not new one

now for Re = 378750 and f = 0.0324

from moody chart

we have \frac{\epsilon}{d} =0.006

\epsilon = 0.006 \times 60

\epsilon = 0.36 mm

thus pipe is old one with increased roughness

You might be interested in
Describe the cycle that purifies drinking water. 40 points
Sunny_sXe [5.5K]
Umm the Water cycle sorry I’m trying
5 0
4 years ago
Read 2 more answers
You are evaluating a variety of new materials for use in the femoral stem of a hip joint replacement.
Lisa [10]

Answer:

a

Explanation:

5 0
3 years ago
Technician A says that empty hazardous waste drums may be disposed of in a public landfill.
zubka84 [21]
I think it would be B
7 0
3 years ago
A 10-kg block A is released from rest 2 m above the 5-kg plate P, which can slide freely along the smooth vertical guides BC and
Liono4ka [1.6K]

Answer:

Check the explanation

Explanation:

<u>Given data </u>

Mass of the block A is Ma = 10kg

Mass of the plate is Mp = 5kg

Coefficient of restitution between the block and that of the plate is e=0.75

Unstretched length of the spring is 0.6m

From the conservation of energy, we have four motion of block A from (1) to (2)

(Ta)_1 + (Va)_1 = (Ta)_2 + (Va)_2

Then accordingly, we will have the step by step calculation in the attached image below .

8 0
3 years ago
An equilibrium mixture of 3 kmol of CO, 2.5 kmol of O2, and 8 kmol of N2 is heated to 2600 K at a pressure of 5 atm. Determine t
garri49 [273]

Answer:

x_{CO}=0.0203\\x_{O_2}=0.0926\\x_{CO_2}=0.227\\x_{N_2}=0.660

Explanation:

Hello,

In this case, we consider the reaction:

CO(g)+\frac{1}{2} O_2(g)\rightleftharpoons CO_2

For which the law of mass action is expressed as:

Kp=\frac{n_{CO_2}}{n_{CO}*n_{O_2}^{1/2}} (\frac{P}{n_{Tot}} )^{1-1-1/2}

Whereas the exponents are referred to the stoichiometric coefficients in the chemical reaction. Moreover, in table A-28 (Cengel's thermodynamics) the natural logarithm of the undergoing reaction at 2600 K is 2.801, thus:

K=exp(2.801)=16.46

In such a way, in terms of the change x the equilibrium goes:

16.46=\frac{x}{(3kmol-x)*(2.5kmol-0.5x)^{0.5}} (\frac{5}{13.5kmol-0.5x} )^{-0.5}

Hence, solving for x:

x=2.754kmol

Thus, the moles at equilibrium:

n_{CO}=3-2.754=0.246kmol\\n_{O_2}=2.5-0.5(2.754)=1.123kmol\\n_{CO_2}=x=2.754kmol\\n_{N_2}=8kmol

Finally the compositions:

x_{CO}=\frac{0.246}{0.246+1.123+2.754+8} =0.0203\\\\x_{O_2}=\frac{1.123}{0.246+1.123+2.754+8} =0.0926\\\\x_{CO_2}=\frac{2.754}{0.246+1.123+2.754+8} =0.227\\\\x_{N_2}=\frac{8}{0.246+1.123+2.754+8} =0.660

Best regards.

7 0
4 years ago
Other questions:
  • In a study comparing banks in Germany and Great Britain, a sample of 145 matched pairs of banks was formed. Each pair contained
    12·1 answer
  • List different types of Gears, Explain the fundamental law of Gearing, Explain the Spur Gear Terminology.
    13·1 answer
  • A evolução da malha rodoviária do Brasil é um marco notável
    9·1 answer
  • Use the image below to measure the blocks. Enter your measurement in centimeters accurate to the 0.1 cm.
    5·1 answer
  • What is a "gob" as described in the glass making process?
    9·1 answer
  • Suppose there are 93 packets entering a queue at the same time. Each packet is of size 4 MiB. The link transmission rate is 1.4
    9·1 answer
  • 3.24 Program: Drawing a half arrow (Java) This program outputs a downwards facing arrow composed of a rectangle and a right tria
    6·1 answer
  • A closed tank contains ethyl alcohol to a depth of 66 ft. Air at a pressure of 23 psi fills the gap at the top of the tank. Dete
    5·1 answer
  • stimate the force required in extruding 70-30 brass at 700C, if the billet diameter is 125 mm and the extrusion ratio is 20
    5·1 answer
  • What is the equation for photosynthesis​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!