Hello i wonder if some of you are good in math?

so well i got this task for my teacher, and i wonder if any of you can solve it? :p


A watertank got volum at 200 litre with water.

The water is adjusted to 70*C and that water that comes inn to the tank is 10*C. on the watertank there is a sign that says: up to 2000W
with 230 V. the effectdegree is at 0,95.

Now find out the power that it takes from the powernett.

how many kWs you need to warm up the water from 10*C to 70*C

Note the warmcapatity is at 1,16 Wh/(kg * k ) = 4.186 kJ / (kg * K )

how long time with it take to heat up the water?

take what you pay for your power were you live, and find out what you need to pay to warm up the water in the watertank


well hope some of you can find out this


sorry for my bad english