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June 30, 2015

Homework Help: college earth science and astronomy

Posted by Elle on Wednesday, March 18, 2009 at 3:30pm.

This isn't homework as much as I am trying to learn this on my own. I am trying to perform an experiment on solar power.

I measured and recorded the volume (V= 250 mL) and mass (M= 250 g) of water in a cup. I then recorded the initial temperature(32 degrees celcius) of the water.

I covered the cup in plastic and placed in the sun for 10 mins.

I removed the plastic and recorded the final temperature (34.5 degrees celcius) then I record the difference of 2.5 degrees celcius.

I have calculated the cups diameter at 9 cm and the surface area of the water at 3.14 * 4.5 *4.5=63.585.

Now this is where I get totally lost.

I must now determine
energy= _______Calories

Then solar energy flux =_____cal/cm^2min

Then solar energy flux=_____cal/m^2min.

Then total solar output per minute=_____calories.

Can anyone help guide me through arriving at the correct answer?

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