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Homework Help: Calculating energy/money loss

  1. Jul 21, 2011 #1
    1. The problem statement, all variables and given/known data
    Assume the cafeteria uses the same hot plate to boil for tea. and that it takes them 30 minutes to heat enough water for one days worth of tea (200 cups, 200g each cup) Find out how much money (in cents) would be wasted per school tear (300 days) due to inefficiency, if the cost of electrical energy is 1 cent for every 4.5x10^5 J?

    2. Relevant equations
    Plate power rating: 628W
    Mass of water: 200g

    Time (sec) water temperature
    0 seconds 23 degrees
    321 seconds 60 degrees

    3. The attempt at a solution
    tbh I dunno where to start, I just know I have to use some random formula of some kind.
    I really suck at energy calculation and whatnot
     
  2. jcsd
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