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What is the radius of a 30'' pipe - Gateway FPD1975W 19" LCD Monitor

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  • Michelle Oliver May 11, 2010

    Are we talking 30" radius, circumference or length?

  • qwertyomen
    qwertyomen May 11, 2010

    what is the circumference?

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30" diameter? Radius is 15" (half of diameter).

30" circumference (distance around) is a little more complicated...

The number what is the radius of a 30 - pi.gif is the ratio of the circumference of a circle to the diameter. The value of pi.gif is approximately 3.14159265358979323846...The diameter of a circle is twice the radius. Given the diameter or radius of a circle, we can find the circumference. We can also find the diameter (and radius) of a circle given the circumference. The formulas for diameter and circumference of a circle are listed below. We roundwhat is the radius of a 30 - pi.gifsrc="http://i.fixya.net/uploads/images/pi.gif" alt="pi.gif" class="h_mi" /> to 3.14 in order to simplify our what is the radius of a 30 - diam_formula.gif circum_formula.gif

Posted on Nov 17, 2009

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  • Expert
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What class are you in? Is this your home work? Anyway, You should know that
Circumference = 2 x pie x radius therefore radius - circumference / 2 x pie in this case radius = 30 x 7 / 2 x 22 = 210 / 44 Now you can calculate that fraction.

Posted on Nov 17, 2009

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I need the formula for figuring cubic yards. for example i have a 100 diameter @ 30 deep. What is the formula to figure my cubic yards


V=?(r^2)h

Where ?=3.14

r^2 is radius square. You have 100 diameter. So 50 is the radius. 50^2=2500

h is height or your depth. When you do your calculations make sure all your measurements are in yards. Meaning radius in yards and depth in yards.

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How much anti freeze is needed at 30 percent to fill 600 feet of 3/4 copper tubing for my baseboard boiler


Let's see... the volume of a 1 foot section is
Pi * radius squared * 12 in (for cubic inches)
3.141 x .375 x.375 * 12 = 5.29 cu in
600 feet therefore has 3179.25 cu in volume
since we know (from google) that 1 pint = 28.875 cu in

Sso in 600 feet of pipe we would expect 110.1 pints of fluid.
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Radius 200 height 500 what is volume


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Sep 02, 2014 | Plumbing

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How many gallons of water will it take to fill 160' of 2"pipe


look up inside diameter of your 2' pipe
area inside a circle = 3.1415 (pi) x radius squared
for example if inside diameter of pipe is 1.75", then radius is half or .875
radius squared is .7656 x 3.1415 = 2.4 square inches

160 feet pipe = 1920 inches
2.4 square inches x 1920 = 4618 cubic inches

Then convert cubic inches into gallons:
http://www.metric-conversions.org/volume/cubic-inches-to-gallons.htm

If water is hot, then that can affect final calculation

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The length of your equipment, even more than the scale of the model, is the most important factor in setting a minimum radius. The list below includes conventionally accepted minimums for each of the major scales.

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(1/3) x pi x radius2 x height x density = pounds

where ::


radius = radius of base in inches

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Feb 22, 2011 | American Standard Plumbing

1 Answer

If a lead pipe 1/4in.thick has an inner diameter of 1/2in.,find the number of cubic inches of lead in a pipe 10ft.long


A pipe can be seen as two cylinders, one of "air" sitting inside the other, in this case lead.
To get the volume of a pipe you thus subtract the volume of the "air" cylinder from that of the lead cylinder.
Volume of a cylinder = area of circular cross section (or pi times square of the radius) times the height (or length) => ? * r2 * h
Volume of a pipe = Volume of cylinder 1 (outer diameter) - volume of cylinder 2 (inner diameter).

In this case; Volume of outer cylinder => inner diameter 1/2" (0.5") + pipe thickness 1/4" (0.25") = 3/4" (0.75") divided by 2 to get radius = 0.375".
3.14 (?) * 0.375 * 0.375 * 120(10 feet) = 53.01438 in3

Volume of inner cylinder => inner diameter 1/2" (0.5") divided by 2 to get radius = 0.25".
3.14 (?) * 0.25 * 0.25 * 120(10 feet) = 23.56194 in3

Volume of lead in this pipe = 53.01438 - 23.56194 = 29.45244 in3

Hope this helps ;)

Jan 27, 2011 | Computers & Internet

1 Answer

The difference between the inner and outer surfaces of a cylindrical pipe is 88cm sq..if the height of the cylindrical pipe is 14cm and the volume is 176cm cube. Find the inner and outer radius of the...


The surface area of the outer surface is the circumference of the outside of the pipe times its length. So, if OR is the radius of the outside of the pipe and SO is the outer surface area,
SO = 2 * pi * OR * 14
Similarly, the surface area of the outer surface is SI = 2 * pi * IR *14 (if SI is the inner surface area and IR is the radius of the inside of the pipe.
The question states that the difference between the outside surface area and the inside surface area is 88 sq. cm:
SO - SI = 88 ; substituting:
(2 * pi * OR * 14) - (2 * pi * IR * 14) = 88 ; factoring
(2 * pi * 14) (OR - IR) = 88 ;dividing both sides by 2*pi*14
(OR - IR) = 88/(2 * pi) = 88/(2 * 3.14159*14) = 1.00
So, the outside radius is 1 cm more than the inside radius.

It's not clear if the volume stated is the volume of the metal in the pipe or the volume of air inside the pipe, so I will solve it both ways:
If volume of 176cc is of the air inside, the formula for this volume is 14 * pi * IR *IR
176 = 14 * 3.14159 * IR * IR ; dividing both sides by 14 * 3.14159
176/(14 * 3.14159) = IR * IR ; doing the arithmetic
4 = IR * IR ; taking the square root of both sides
sqrt(4) = IR
IR = 2 cm
substituting back into the first equation, the OR is 1cm more than the IR, so
OR = 3 cm

If volume of 176cc is of the iron in the pipe, the formula for that volume is the difference between the volume of the outside of the pipe and the volume of the inside of the pipe, or
(14 * pi * OR * OR) - (14 * pi * IR * IR) = 176 ; factoring
(14 * pi) ((OR * OR) - (IR * IR)) = 176 ; dividing both sides by 14 * pi
((OR * OR) - (IR * IR)) = 176/(14 * 3.14159) = 4
but, since OR is 1 cm more than IR (from above), we can substitute OR = IR + 1
and OR * OR = (IR + 1) * (IR + 1) = (IR*IR) + 2*IR +1
So, ((OR * OR) - (IR * IR)) = 4 becomes
(IR*IR) + 2*IR +1 - (IR*IR) = 4 ; simplifying (IRsquared - IRsquared = 0)
2*IR + 1 = 4 ; subtract 1 from both sides
2*IR = 3 ; divide both sides by 2
IR = 3/2 ;
IR = 1.5cm
OR = 2.5cm

Jan 11, 2011 | Mathsoft StudyWorks! Mathematics Deluxe...

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