Calculating Work Required to Lift a Hanging Chain

[Default User]

Homework Statement

A chain hangs verticaly from a building. The chain is 30 ft long and is 5 lb/ft³, how much work is needed ot lift the bottom of the chain to the top.

Homework Equations

If you put the axis where the chain is hanging your limits would be 0 and -30

The Attempt at a Solution

So I tried \int^{0}_{-30}5/30y dy

Then I get 1/12y² and solve it for 0 and -30 and get 75 lb/ft, but it doesn't seem right.

(sorry if I didnt use the templete right, I'm a noob at this)

 

[cristo]

I'm moving this to physics. Questions based on physics principles whilst still using calculus should be put in the intro physics homework forum.

 

[Default User]

Nobody?

Not even a "no your wrong" or "yes that's right"?