Homework Help: Physics

Posted by college on Friday, July 2, 2010 at 6:19pm.

My question is two parts

How many calories of heat energy would it take to heat 200 mL of water from 20C to 80C?

a) How long would it take to heat the water in the previous question using a heater with a power rating of 50W?

Looking for equations to solve this problem.

Physics - bobpursley, Friday, July 2, 2010 at 6:29pm
a. heat= 200g*1cal/gC * 60C

b. heat=power*time

time= heat/power= above heat/power.

Well, at this point, you have to change calories to joules, as 50watts=50joules/sec

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