Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition

14-1: Heat as Energy Transfer
14-3 and 14-4: Specific Heat; Calorimetry
14-5: Latent Heat
14-6 to 14-8: Conduction, Convection, Radiation

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 11
  1. How much energy is required to bring a 1.0-L pot of water at 20C20 ^\circ \textrm{C} to 100C100 ^\circ \textrm{C}?
  2. For how long could this amount of energy run a 60-W lightbulb?
  1. 3.3×105 J3.3 \times 10^5 \textrm{ J}
  2. 93 min93 \textrm{ min}
Giancoli 7th Edition, Chapter 14, Problem 11 solution video poster

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This is Giancoli Answers with Mr. Dychko. The heat gained by this pot of water is going to be the mass of water times specific heat capacity times change in temperature. And the mass will be the volume times density. And the volume is 1.0 liters times 1 kilogram for every liter, density of water, times 4,186 joules per kilogram Celsius degree times the change in temperature, 100 degree Celsius minus 20. And that gives 3.3 times 10 to the 5 joules. And the amount of time that this amount of energy could power a 60 watt bulb. Well, we'll figure that out by knowing that power is energy divided by time. And then we'll solve this for t by multiplying both sides by t over p. Then the left side were left with time and on the right side we have p in the bottom. And that's energy divided by power. So, that's 3.3488 times 10 to the 5 joules divided by 60 watts which is about 93 minutes after you convert the 5,581 seconds times by 1 minute for every 60 seconds. 93 minutes, the 60 watt bulb could be powered.

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