# Heat Energy Question

1. Dec 10, 2007

### shakejuhn

1. The problem statement, all variables and given/known data
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?

2. Relevant equations
q=mc(Tf-Ti)
Q=mc Delta T
Delta T = |Tf-Ti|

3. 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.

2. Dec 10, 2007

### tyco05

potential energy = mgh

This is the energy available to be converted to heat.

3. Dec 10, 2007

### shakejuhn

ok so P.E.=MGH

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

is this correct there are still 2 unknows

4. Dec 10, 2007

### tyco05

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

Set them equal and solve for delta T.

5. Dec 10, 2007

### 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??