Answer:
If a runner exerts 350 J of work to generate 175 W of power, it took the runner 2 seconds to do the work.
Explanation:
Power is defined as the speed with which a job is done. In other words, power is a given amount of work done in a given unit of time. That is, it is the amount of work per unit of time that some object or system produces.
Its expression is:
[tex]P=\frac{W}{t}[/tex]
where:
- P: Power developed by the force doing the work. Its unit of measure in the International System is the Watt (W)
- W: Work. Its unit of measure in the International System is the Joule (J)
- t: Time during which the work is carried out. Its unit of measurement in the International System is the second (s).
In this case:
Replacing:
[tex]175 W=\frac{350 J}{t}[/tex]
and solving you get:
[tex]t=\frac{350 J}{175 W}[/tex]
t= 2 s
If a runner exerts 350 J of work to generate 175 W of power, it took the runner 2 seconds to do the work.
