A 1000-watt microwave oven takes 60 seconds to heat a bowl of soup. How many joules of energy does it use?

The microwave uses ##6000 J## of energy.

Where ##P## = Power, ##t## = time, and ##W## = work ...

##P = 1000## watts ##t = 60## seconds

The formula for Power is given by:

##P = W/t##

Therefore:

1000 Watts = ##W/60##

So ...

##W=1000(60) =6000 W## (or J=Joules)

From this, we can say that a microwave oven of 1000 W uses 6000 J of in 1 minute (60 seconds).