Question

A cylindrical piece of iron pipe is shown below. The wall of the pipe is 1.25 inch thick.
What is the approximate inside volume of the pipe?

88 cubic inches

49 cubic inches

142 cubic inches

154 cubic inches

Answer 1

@Shane_B

Answer 2

nice to see both of you again lool

Answer 3

help? i dontderstand how to get just the insdie

Answer 4

*inside

Answer 5

lol

Answer 6

so, what do you do after you get the whole volume?

Answer 7

<smacks forehead>

Actually, it's even simpler than that. The volume of the inner cylinder will just be (6-2.5)/2, height = 16in) which can be plugged in the normal volume formula: V=pi r^2 h.

Answer 8

All I'm doing there is subtracting the wall thickness (1.25*2=2.5) from the diameter...cutting it in half to get the new radius...and then just applying the cylinder volume formula.

Answer 9

so, im confused lol

Answer 10

would the answer be 28?

Answer 11

I don't want you to be confused. First, do you see where the inner radius will be \[\frac{6-2.5}{2}\]?

Answer 12

do you have the answer

Answer 13

yeah

Answer 14

yeah to *Shane_B

Answer 15

cooool

Answer 16

that would be 7.5

Answer 17

Ok that leaves you with a radius of 1.75in. And you know the height of the cylinder is 16in so:\[V_{cyl}=\pi (1.75)^2(16)=?\]

Answer 18

153.86

Answer 19

Close enough...I used a longer version of pi

Answer 20

so 154! YAY!

Answer 21

:)

Answer 22

yay yaya yaya ya

Answer 23

thanks

Answer 24

np