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
Anettt [7]
3 years ago
14

How high a building could fire hoses effectively spray from the ground? Fire hose pressures are around 1 MPa. (It is also said t

hat larger fire engine mounted pumps can deliver from 90-300 gallons per minute, and hoses can be as wide as 30 cm diameter What alternative estimate would that info give you?)
Engineering
1 answer:
Mrac [35]3 years ago
7 0

Answer:

z_{2} = 91.640\,m

Explanation:

The phenomenon can be modelled after the Bernoulli's Principle, in which the sum of heads related to pressure and kinetic energy on ground level is equal to the head related to gravity.

\frac{P_{1}}{\rho\cdot g} + \frac{v_{1}^{2}}{2\cdot g}= z_{2}+\frac{P_{2}}{\rho\cdot g}

The velocity of water delivered by the fire hose is:

v_{1} = \frac{(300\,\frac{gal}{min} )\cdot(\frac{3.785\times 10^{-3}\,m^{3}}{1\,gal} )\cdot(\frac{1\,min}{60\,s} )}{\frac{\pi}{4}\cdot (0.3\,m)^{2}}

v_{1} = 0.267\,\frac{m}{s}

The maximum height is cleared in the Bernoulli's equation:

z_{2}= \frac{P_{1}-P_{2}}{\rho\cdot g} + \frac{v_{1}^{2}}{2\cdot g}

z_{2}= \frac{1\times 10^{6}\,Pa-101.325\times 10^{3}\,Pa}{(1000\,\frac{kg}{m^{3}} )\cdot(9.807\,\frac{m}{s^{2}} )} + \frac{(0.267\,\frac{m}{s} )^{2}}{2\cdot (9.807\,\frac{m}{s^{2}} )}

z_{2} = 91.640\,m

You might be interested in
What are the advantages and disadvantages of a mine heardgear​
Irina18 [472]

Answer:

If there is a shaft with headgear, then mining can take place until that depth of the shaft. If it is accessed horizontal Adits, it can mine until the lowest Adit from upwards. If it is accessed decline, the development and mining can continue so long as economic exploitation is possible.

Explanation:

What are the disadvantages of mining headgear? They totally cut off your vision of anything above your head. They are hot, most of the time

7 0
1 year ago
Using the AASHTO procedure, determine the thickness required for a base and a surface layer over existing subgrade. The structur
garri49 [273]

Answer:

<u>the thickness required would be 12 inch HMA and granular base layer of 6 inches</u>

Explanation:

structural number = 4.5

stone base course material coefficient = 0.13

hma material layer coefficient = 0.40

drainage coefficient = 0.90

we will use layered analysis procedure to get thickness

D1 >= sN1/a1

when we cross multiply,

sN1 = a1D1 >=sN1

D2 >= -sN2-sN1/a2m2

sN2* + sN1* >= sN2

D3 >= sN3-(sN1*+sN2*)/a2m2

where a1,a2,a3 = layer coefficient

d1 d2 d3 = actual thickness

m2,m3 = coefficient of base

a1 = 0.4

a1 = 0.13

sN = 4.5

m2 = 0.9

D1 >= sN1/a1 = 4.5/0.4

= 11.25

thickness of surface = 12 inches

a1D1 = 0.4x12 = 4.8

we have value of sN2 = 5.5

(5.5 -4.8)/(0.13*0.9)

= 0.7/0.117

= 5.9829 inches

approximately 6 inches

so the pavement will have 12inch HMA surface and 6 inches granular base layer.

7 0
3 years ago
"All data types are keywords but all keywords are not data types", justify this statement.​
STALIN [3.7K]
<h3>Hey Mate Here Is Your Answer</h3>

Keywords Are Reserved Words Which Are Not Use As Normal Cases But Used For Special Purpose In Our Program whereas, Data Type Tells The Compiler And Interpreter How The Program Is Going To Be Executed And Can Be Used At Every Cases.

<h3>Hope This Helps You ❤️</h3>
5 0
2 years ago
¿Qué es la COPARMEX? y ¿Cuáles son sus atribuciones o facultades?
vovangra [49]
All
Description
DescriptionCoparmex or Confederación Patronal de la República Mexicana is the Mexican Employers' Association. Current president: Fernando Treviño Núñez, The Employers Confederation of the Mexican Republic is a voluntary membership business organization, looking through representation in the workplace and society. Wikipedia
7 0
3 years ago
It is acceptable to miss used absorbentes
Flauer [41]

Explanation:

I assume you meant mix instead of miss because the question wouldn't make sense otherwise.

I'd have to guess and say it is acceptable, because in order to comply with the used oil rule, a facility must properly manage its oil-contaminated sorbents (i.e., don't mix other wastes with these sorbents), and it must either recycle sorbents or send them for disposal at a permitted facility that burns them for energy recovery.

If this is incorrect, don't hesitate to report this answer.

4 0
3 years ago
Other questions:
  • What must engineers keep in mind so that their solutions will be appropriate? O abstract knowledge O context O scientists persev
    12·1 answer
  • Water is the working fluid in a Rankine cycle. Superheated vapor enters the turbine at 8 MPa, 560°C and the turbine exit pressur
    13·1 answer
  • A package is thrown down an incline at A with a velocity of 1 m/s. The package slides along the surface ABC to a conveyor belt w
    13·1 answer
  • A(n) is a detailed, structured diagram or drawing.
    6·1 answer
  • Which field in a Transmission Control Protocol (TCP) header is chosen from ephemeral ports?
    11·1 answer
  • The pressure distribution over a section of a two-dimensional wing at 4 degrees of incidence may be approximated as follows: Upp
    9·1 answer
  • name the process by which mild steel can be converted into high carbon steel and explain it briefly ?​
    12·1 answer
  • You want to see both Michael and Meet Wally Sparks. If you purchase tickets for both
    7·1 answer
  • If a material is found to be in the tertiary phase of creep, the following procedure should be implemented:
    8·1 answer
  • Describe how you would control employee exposure to excessive noise in a mining environment
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!