Power developed by a person on eating 100g of ice per minute is?

  • #1
Mimosapudica
11
1
Homework Statement:
Power generated is the work done per unit time. Also latent heat of ice is 80cal.
Relevant Equations:
P=W/t
W= Energy = heat generated ?
Heat Q= mass x latent heat
P=W/t
W=Q= mL = (100x 80x 4.2)/1000 (kg x J/kg)
= 33.6
t= 1 minute= 60s
P= 33.6/60= 0.56 watt...
but the answer provided is 560J/s...?
 

Answers and Replies

  • #2
PeroK
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Looks like you are out by a factor of 1000. What's usually the reason for that?
 
  • #3
Mimosapudica
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Looks like you are out by a factor of 1000. What's usually the reason for that?
I’m guessing the g to kg conversion has some problem, but shouldn’t we be converting it?
 
  • #4
PeroK
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I’m guessing the g to kg conversion has some problem, but shouldn’t we be converting it?

Why don't you first write down all the quantities involved in SI units?
 
  • #5
Mimosapudica
11
1
Looks like you are out by a factor of 1000. What's usually the reason for that?

Oops.. latent heat is 80 cal/g .. So it doesn’t need conversation.. that was a careless error.. thank you.
 

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