Question

The Eyebrow Trimmer 5000 XL that Duncan's "friends" used in themalicious eyebrow-shavingattack works at 30 J/s and gaveout a total of 450J of pure trimming energy.How long did it take for Duncan's friends to shave off his eyebrows?

Answer 1

In order to determine the time, use the following formula for the power:

`P=(E)/(t)`

where,

P = 30J/s

E = 450J

t = ?

Solve the equation above for t and simplify:

`t=(E)/(P)=(450J)/(30(J)/(s))=15s`

Hence, the time was 15s