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The United States Power plants consumed 39.5 quadrillion Btus of energy and produced 3.675 trillion kWh...

  1. The United States Power plants consumed 39.5 quadrillion Btus of energy and produced 3.675 trillion kWh of electricity. What is the average efficiency of the power plants in the U.S.? (answer: ~32%)
  2. Calculate how much heat must be removed from a 1.0 kg bucket of water to
    1. Cool the water from 30°C to 0°C. (answer: ~126kJ)
    2. Freeze the water in the bucket completely. (answer: ~334kJ)
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