« previous next »
Pages: [1]   Go Down

Author Topic: Calc II Work Question Help D:  (Read 3240 times)

0 Members and 1 Guest are viewing this topic.

Offline Yeong

  • Not a bridge
  • LV12 Extreme Poster (Next: 5000)
  • ************
  • Posts: 3739
  • Rating: +278/-12
  • Survivor of Apocalypse
    • View Profile
Calc II Work Question Help D:
« on: September 12, 2012, 03:17:02 pm »
All right, I have this question:
A tank is is half full of oil that has a density of 900kg/m3. Find the work W required to pump the oil out of the spout. (Use 9.8 for g and 3.14 for pi. Round your answer to three significant digits.)



r=3
h=1

I don't know how to work this one since the tank is only half full. :\ Apparently diving the full one by 2 doesn't work. Why is that?

EDIT: So for full one, I know that I do integral (900*9.8*pi(9-y^2)*(4-y)) from -3 to 3.
So if I want to do the half one, (900*9.8*pi(9-y^2)*(7-y)) from 0 to 3, right?
« Last Edit: September 12, 2012, 04:04:17 pm by yeongJIN_COOL »
Logged
Sig wipe!

Offline ruler501

  • Meep
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2475
  • Rating: +66/-9
  • Crazy Programmer
    • View Profile
Re: Calc II Work Question Help D:
« Reply #1 on: September 12, 2012, 05:38:02 pm »
Are you given the equation for the tank or can you assume its a sphere with a spout on top?
If you can assume its a sphere I'd use the equation for that otherwise integrate the function solved for x for -3 to 0 I'd assume(assuming that the bottom is -3 and top is 3)
Logged
I currently don't do much, but I am a developer for a game you should totally try out called AssaultCube Reloaded download here https://assaultcuber.codeplex.com/
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCM/CS/M/S d- s++: a---- C++ UL++ P+ L++ E---- W++ N o? K- w-- o? !M V?
PS+ PE+ Y+ PGP++ t 5? X R tv-- b+++ DI+ D+ G++ e- h! !r y
Pages: [1]   Go Up
« previous next »