Final answer:
A 1000 W microwave that operates for 5 minutes uses 300,000 joules of energy. The calculation is done by multiplying the power rating (1000 watts) by the time in seconds (300 seconds).
So, the correct answer is B. 300,000 J.
Step-by-step explanation:
The question asks to calculate the amount of energy used by a 1000 W microwave during a 5-minute operation. To find the energy used, you can use the formula:
Energy (in joules) = Power (in watts) × Time (in seconds)
Since power is given in watts (which is joules per second) and time needs to be in seconds, you first convert 5 minutes to seconds:
5 minutes = 5 × 60 seconds = 300 seconds
Now calculate the energy:
Energy = 1000 W × 300 s = 300,000 J
So, the correct answer is B. 300,000 J.