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12a. If the price of electrical energy is $0.09 per kilowatt·hour, what is the cost of...

12a. If the price of electrical energy is $0.09 per kilowatt·hour, what is the cost of using electrical energy to heat the water in a swimming pool (12.0 m x 9.00 m x 1.50 m) from 12 to 26 °C? Number Entry field with incorrect answer Units Entry field with correct answer

The number of significant digits is set to 3; the tolerance is +/-1 in the 3rd significant digit

b, A 0.260-kg piece of aluminum that has a temperature of -159 °C is added to 1.0 kg of water that has a temperature of 2.7 °C. At equilibrium the temperature is 0 °C. Ignoring the container and assuming that the heat exchanged with the surroundings is negligible, determine the mass of water that has been frozen into ice.

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The number of significant digits is set to 3; the tolerance is +/-1 in the 3rd significant digit
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Answer #1

Kindly note answers may slightly vary as specific heat of { aluminium(900 ), water(4186), latent heat of fusion (334*10^3)} has been taken from data book.

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