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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.

Number Units

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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