Question

How long would a 150 W lightbulb have to glow to produce the same amount of energy expended by Georgie?

Answer 1

17.2s

Step-by-step explanation:

We are given that

Mass of Georgie's brother=28kg

Mass of sled=9.1Kg

Total mass pulled by Georgie=28+9.1=37.1 Kg

Force applied =F=23N

Displacement=s=

Work done=
`F* s`

By using the formula

Energy expended by Georgie=
`23* 112=2576J`

Power=150 W

We know that

Power=
`(work\;done)/(time)`

`Time=(work\;done)/(power)`

By using the formula

Time=
`(2576)/(150)=17.2 s`

Hence, the time for which glow to produce the 2576J =17.2s