What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months

93312000 Joules

Explanation:

Energy can be explained as the capacity for doing work. And can be expressed as

E= pteqn(1)

Where

E= Energy in Joules

P= power in Watt= 2.00W

t= time in seconds

Time= 18 months, which can be converted to "seconds" as;

18 months = [ 18 monthsx 30 days x 24 hours x 60 min x 60 sec] = 46656000

Then

time= 46656000 seconds

Power=2 watt

If we substitute into equation (1) we have

Energy = 2 watt × 46656000 seconds

Energy= 93312000 Joules

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