Calculating Temperature Rise in 100m Waterfall: Heat Energy Questions

[shakejuhn]

Homework Statement

Much of the energy of falling water in a waterfall is converted into heat.

If all the mechanical energy is converted into heat that stays in the water, how much of a rise in temperature occurs in a 100 m waterfall?

Homework Equations

q=mc(Tf-Ti)
Q=mc Delta T
Delta T = |Tf-Ti|

The Attempt at a Solution

i have no idea where to start or what equation to use all i see is the 100m can some one please lead me in the correct direction with the correct formula to use.

 

[tyco05]

potential energy = mgh

This is the energy available to be converted to heat.

 

[shakejuhn]

ok so P.E.=MGH

P.E. = M(9.8)(100)

is this correct there are still 2 unknows

 

[tyco05]

If all the energy is converted into heat then P.E. = Q

Set them equal and solve for delta T.

 

[shakejuhn]

ok so the equation would look like this

M(9.8)(100) = mc Delta T

but i still need to know the Mass and MC am i overlooking something??