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A rapidly spinning paddle wheel raises the temperature of 200mL of water …?

A rapidly spinning paddle wheel raises the temperature of 200 mL of water from 21 degrees Celsius to 25 degrees Celsius. What is the amount of work done in this process, and how much heat is transferred?

3 Answers

J
Jadon Gerhold

Jan 22, 2025

the work is done by the friction force. All the work will go to increase the internal energy of the water.

Q=mC∆θ=3360 J

Where C=4200J, m=1000×200×10^-6=0.2 kg

There are ''No'' heat transfer in the process.

E
Emery Toy

Jan 03, 2025

specific heat of water is 4.186 kJ/kgC

200 mL = 0.2 kg

E = 4.186 kJ/kgC x 0.2 kg x (25–21)C = 3.35 kJ

which is the work done, and the heat (thermal energy) transferred

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