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
The polycarbonate shell functions as all of the following except:
krok68 [10]

Answer:

what are the answers expect what?

Explanation:

Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.

6 0
3 years ago
Two transmission belts pass over a double-sheaved pulley that is attached to an axle supported by bearings at A and D. The radiu
Fynjy0 [20]

Answer:

Check the explanation

Explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

6 0
4 years ago
Have you ever had an ice cream headache that’s when a painful sensation resonates in your head after eating something cold usual
san4es73 [151]

Answer:

Cause and effect

Explanation:

pls mark brainliest

5 0
3 years ago
Read 2 more answers
From the hazards blisted below, determine which could require foot protection​
MrRa [10]
Foot protection could be required with Sharps, Slippery areas, Hazardous liquids,and Falling objects.

Hope this helps!!
8 0
3 years ago
Plot the data as impact energy versus temperature: (b) Determine a ductile-to-brittle transition temperature as the temperature
Shkiper50 [21]

Question:

The following tabulated data were gathered from a series of Charpy impact tests on a commercial low-carbon steel alloy.

Temperature(∘C)50403020100-10-20-30-40Impact energy (J)76767158382314951.5

(a) Plot the data as impact energy versus temperature.

(b) Determine a ductile-to-brittle transition temperature as the temperature corresponding to the average of the maximum and minimum impact energies.

(c) Determine a ductile-to-brittle transition temperature as the temperature at which the impact energy is 20 J.

Answer:

a)  see the attached graph

b) max E = 76 and Min E =1.53 average = 77.5/2 = 38.75 J

this corresponds to about 10° C

c ) at E = 20 J temperature is about -2°C

8 0
4 years ago
Read 2 more answers
Other questions:
  • A cylinder contains 480 cm3 of loose dry sand which weighs 820 g. Under a static load of 200 kPa the volume is reduced 1%, and t
    15·1 answer
  • A wastewater is to be disinfected using ultraviolet (UV) light. Batch experiments find that the bacterial concentration decays u
    10·1 answer
  • When a certain motor is started, it is noticed that its supporting frame begins to resonate when the motor speed passes through
    10·1 answer
  • A mass of 1.9 kg of air at 120 kPa and 24°C is contained in a gas-tight, frictionless piston–cylinder device. The air is now com
    7·1 answer
  • Verizon LTE
    12·1 answer
  • Find vC(t) for t ≥ 0 (in V), assuming the switch was open for a long time when closed at t = 0.
    14·1 answer
  • Place the following steps for calculating net worth in the correct order.
    13·1 answer
  • Describe an example (other than the ones mentioned in this chapter) of data whose confidentiality has a short timeliness, say, a
    15·1 answer
  • A wall that cannot be moved because it is carrying the weight of the roof is considered a wall
    12·1 answer
  • Dndbgddbdbhfdhdhdhhfhffhfhhddhhdhdhdhdhd​
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!