Question

Find the work in ft-lbs required to empty a full hemispherical tank w/ a radius of 6 ft by pumping the water to 2 ft above the top of the tankk

Answer 1

@sleepyhead314

Answer 2

>.> I still don't know how to help with this hemispherical stuff...

Answer 3

k let's do the last few and get back to this

Answer 4

im here

Answer 5

This is probably gonna be wrong...
62.4pi times the integral from 0 to 6 of (-72y + 6y^2 + y^3) dy

Answer 6

yeah... I don't think I did it right, sorry

Answer 7

hold on

Answer 8

it has to be pi again but i don't think it's a big negative number. this one is kind-of negative

Answer 9

i got -105859

Answer 10

try it from here that'll be the format
http://prntscr.com/3leq0z
plug in 6 for R

Answer 11

i got pi*y^4

Answer 12

... plug in 6 for R
that'll give you the type of stuff I'll usually have you plug in
http://www.wolframalpha.com/input/?i=62.4pi+times+the+integral+from+0+to+6+of+%2872x+-+18x%5E2+%2B+x%5E3%29+dx

Answer 13

62515.5 and in pi would be?

Answer 14

just try that, I'm not sure why it's not showing up with a pi

Answer 15

k wait

Answer 16

he said no.
i tried rounding

Answer 17

sorry, but I've gtg now :(
good night.
try looking through hero's work
look for where he got his numbers and stuff
good luck
good night

Answer 18

i'll get in touch with me thanks for your time and help

Answer 19

him*

Answer 20

@Hero

Answer 21

@satellite73 @ganeshie8

Answer 22

do you have a pic?

Answer 23

there's no picture. that's all i have

Answer 24

wait

Answer 25

hero gave me this:
http://assets.openstudy.com/updates/attachments/537d3749e4b015d57c6438e6-hero-1400719958596-workftlbs.png

Answer 26

My English is not good, so that I want to make sure that I understand the problem. pump the water into or out of the hemisphere?

Answer 27

out

Answer 28

so, the hemispherical tank is not empty then, right? just lost amount of water only. And our duty is find out the work done on pumping out process, right?

Answer 29

yes to 2ft above the top of the tank