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

See attachment

**2. Relevant equations**

I guess I need to do something with this equation:

P= *c _{m}*ρJΔT

ρ is then the density of water 1000m^{3}/kg

J is given

Cm is given

But what to do with the temperatures… ΔT= Th-Ta? But then you get a negative number and the ask for the power delivered…

http://ift.tt/1lcAdBY