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Power of the boy

  1. Sep 10, 2014 #1
    A boy is able to chew 20g of ice in 5 min. Calculate the power of the boy in horse power.
    Solution: Power=Work/time=JML/T
    what are those j,M,L
    Those values are
    J=4.2J/cal
    L=80cal/gram
    M is its mass
    can anyone tell me about those quantities.
    Thanks in advance
     
  2. jcsd
  3. Sep 10, 2014 #2

    NascentOxygen

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    Staff: Mentor

    The calorie is an older unit of energy, especially used with heat energy. Thre are 4.2 calories in 1 Joule.

    I think the question should begin: "A boy can melt 20 g of ice in 5 mins".
     
  4. Sep 10, 2014 #3
    i too thought of the same but what about L
    I think its latent heat.
    But, what is the relation between latent heat and the energy consumed???
     
  5. Sep 10, 2014 #4

    NascentOxygen

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    Staff: Mentor

    Latent heat of fusion is the heat needed to turn ice into water.

    A well-considered question/answer probably should also include the heat he adds that brings the water up to body temperature, because that is inevitable.
     
  6. Sep 11, 2014 #5
    Thank you
     
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