Question

How much time is needed to produce 720 joules of work if 90 watts of power is used

Answer 1

8 seconds

Step-by-step explanation:

power (P) is defined as the rate at which work is done.

power is measured in Watts (W) , when the work done is measured in Joules (J) and time in seconds

by the definition of power,

`power=(work.done)/(time)\\ time=(work.done)/(power)\\ =(720J)/(90W) \\=8 seconds`