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