Answer:
0.031 W
Explanation:
The power used is equal to the rate of work done:
[tex]P=\frac{W}{t}[/tex]
where
P is the power
W is the work done
t is the time taken to do the work W
In this problem, we have:
W = 900 J is the work done by the motor
t = 8 h is the time taken
We have to convert the time into SI units; keeping in mind that
1 hour = 3600 s
We have
[tex]t=8\cdot 3600 =28,800 s[/tex]
And therefore, the power used is
[tex]W=\frac{900}{28800}=0.031 W[/tex]
