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## Homework Statement

A household uses 100 gallons of hot water per day (1 gallon of water has a mass of 3.78 kg) and the water temperature must be raised from 10°C to 50°C

a) find the average power needed to heat the water.

b)Then assume you have solar collectors with 55% average efficiency at converting sunlight to thermal energy when tilted at your location's latitude. Using the table find the collector area needed to supply this power in Albuquerque in June.

From looking at the text, the tilted altitude is 296.

## Homework Equations

Q=mcΔt

## The Attempt at a Solution

For part A I think I need to find the mass of 100 gallons of water? This would be 3780 kg. (make sure I am right on this)

I would then use the formula I stated above. So

Q= (3780) (4.184) (40) -is this correct for water?

Then the answer would be 632620.8

I am not sure if this is right.

For part B I have no idea what formula I should be using