Answer:
10.22 m^3/s
Explanation:
To estimate the pressure drop in a pipe we use the Darcy-Weisbach equation
(equation 1)
With:
= Darcy-Weisbach friction coefficient
L = length of duct or pipe
v = velocity of fluid
D= hydraulic diameter
Also flow rate is:
Where v is:
Area as a function of the diameter is:
So
(equation 2)
For a laminar regime the the Darcy-Weisbach friction coefficient is function of the Reynolds number (Re) as:
With: v =velocity, D= diameter if the pipe and u= viscosity.
With this information alpha would be:
(equation 3)
Replacing equation 3 in equation 1 we have:
And finally replacing the value for v in this equation we have:
Clearing for Q we get an expression to estimate the expected flow rate in the pipe.
We know
Delta P = 1.84 psi or
L= 75 ft or 900 in
D for a 2 nominal schedule 40 PVC is 2.047 in. In tables you find External diameter and internal diameter. For calculations you use internal diameter (ID)
U for water at 20°C is or
So the flow expected for this pipe is or
Answer:
present cost = $302218.15
Explanation:
given data
cost of the work 1st year A1 = $100,000
cost of the work 2nd year A2 = $85,000
cost of the work 3rd year A3 = $70,000
cost of the work 4th year A4 = $55,000
cost of the work 5th year A4 = $40,000
interest rate r = 6% = 0.06
to find out
present worth cost is for the first 5 years
solution
present worth cost will be here as per given equation
present cost = .........................1
here r is rate of interest and A is amount given
put here value we get
present cost =
present cost = $302218.15
Answer:
Q=127.66W
L=9.2mm
Explanation:
Heat transfer consists of the propagation of energy in the form of heat in different ways, these can be convection if it is through a fluid, radiation through electromagnetic waves and conduction through solid solids.
To solve any problem related to heat transfer, the general equation is used
Q = delta / R
Where
Q = heat
Delta = the temperature difference
R = is the thermal resistance by conduction, convection and radiation
to solve this problem we propose the previous equation
Q = delta / R
later we find R
Q=(25-(-5))/0.235=127.66W
part b
we use the same ecuation with Q=127.66
Q = delta / R
Δ
The modern hydraulic lifts make use of biodegradable fluid to transmit hydraulic power
<em>Question: The options are left out in the question. The details and facts about the modern hydraulic lift are presented here</em>
<em />
Details about the modern hydraulic lifts include;
The development of the modern hydraulic occurred in the Industrial Revolution to perform task done previously by steam powered elevators
The power of the hydraulic lift come from the hydraulic cylinder known as the actuator, which in turn is powered by pressurized hydraulic fluid such as oil
The hydraulic fluid is pushed by a piston rod through which energy is capable of being transferred, such that the applied force is multiplied, to provide more power for lifting
<u>Facts about the modern hydraulic lifts include;</u>
- The dry motor in the modern hydraulic lift is more efficient and consumes 20% less energy
- It comprises of valves that are controlled electronically such that the response is much rapid and the energy consumption is reduced by a further 20%
- The cars used in the modern lift are lighter, as well as the slings, which reduces the power usage by 20%
- It makes use of chemicals which are environmentally friendly as hydraulic fluid
- The flash point of the fluid used is higher, as well as it posses 50% lower compressibility as well elasticity
Learn more here:
brainly.com/question/16942803