Question

Which of the following statements describe the transfer of energy

A.Collision of atoms causing nuclear reactions
B. A car speeding up from 5 mi/hr to 40mi/hr
C. A weightlifter lifting 100 lb. bell from his chest to a certain hight
D. A transformer stepping down the voltage of electricity in power lines

Answer 1

C. A weightlifter lifting 100 lb. bell from his chest to a certain height

Step-by-step explanation:

When weight lifter lift the weight from one position to other higher position then in that case the weightlifter has to do some work in order to lift against gravity

That work is given as

`W = F.d`

here we know that force is F = mg

so here work done will be

`W = mgh`

so here the work done by the weight lifter is the potential energy stored in the weight which is lifted upwards.

So here energy is transferred by the weightlifter which is stored in the weight