Question

Calculate the power of a person that does 8kJ of work in 4 hours

Answer 1

Step-by-step explanation:

Energy used is power multiplied by time.

Power is energy used divided by time

8 kj is 8000 j

4 hours is 240 minutes

240 minutes is 14400 seconds

8000j divided by 14400 is 0.55 recurring, measured in watts

Answer 2

`\text{Power,}~ P = \frac{\text{Work done}}{\text{Time}}\\\\\\~~~~~~~~~~~~~=(8 * 1000~J)/(4 * 3600~ s)\\\\\\~~~~~~~~~~~~~~=(80)/(144)\\\\\\~~~~~~~~~~~~~~=0.56~ W`