UCLAstudent

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It's the question about the peanut. There is just an arrow on my answer sheet... no answer. Thanks!
 
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UCLAstudent

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Wait, wouldn't the answer be B, 1 kcal?

Using Q=MCT and solving for Q:

Q= (1000 grams) x (1 J/(gxC)) x 50C

I got 50,000 Joules. Divide by 10 for to get 5,000 Joules per peanut. 5,000 Joules = 1 Kcal.

Did I mess something up?
 

a*brown

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Originally posted by UCLAstudent
Wait, wouldn't the answer be B, 1 kcal?

Using Q=MCT and solving for Q:

Q= (1000 grams) x (1 J/(gxC)) x 50C

I got 50,000 Joules. Divide by 10 for to get 5,000 Joules per peanut. 5,000 Joules = 1 Kcal.

Did I mess something up?


Don't use c = 1 J/g C because that's wrong. c = 1 cal/g C

So...

q = (1000 g) (1 cal/g C) (50 C) = 50,000 cal = 50 kcal for 10 peanuts.

5 kcal = 1 peanut
 
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