Question

._.

Answer 1

this is from a practice test i did the other day...i chose d and it's wrong :/ i'd like to know what the right answer is, and how you got that answer. thanks :)

Answer 2

hey jake :)

Answer 3

Hi :)

Pipe 1: radius1 = 5 cm

Pipe 2: circumference2 = 20pi = 2pi*radius2.... so radius2 = 20pi / 2pi = 10 cm

Now that you have the radius for each, you can compare the volumes more easily.

Answer 4

right, i did that and got a volume 4 times bigger...?

Answer 5

the area of the circle for pipe 1 will be pi*radius^2 = 25pi
the area for the circle for pipe 2 will be pi*radius^2 = 100pi

For equal length pipe, the volume should be 4 times larger.

Wonder why (how) that could be wrong?

Answer 6

not the best writing, but here:

Answer 7

yea that's what i was thinking!

Answer 8

maybe i should call my teacher or something...but it was only a practice test, so it didn't really matter...

Answer 9

I can't see an error in the logic or the math... I wonder if the answer for the test was incorrect.

Answer 10

ok...i'll have to call her about that...do you wanna help me with another question i got wrong? i got 50/60 on the practice test :/

Answer 11

i'll post it in a new thread

Answer 12

ok