A battery supplies a steady current of 56a for 21s during, Physics

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A battery supplies a steady current of 56a for 21s during

A battery supplies a steady current of 5.6A for 21s. During this time 1410J of chemical energy is transformed into electric energy, but 560J of this electric energy is transformed into heat energy inside the battery.

a) What is the emf of the battery?

b) What is the total power output by the battery?

c) What is the terminal voltage of the battery?

d) What is the internal resistance of the battery?

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