Question

Physics question

Answer 1

If Alice does 10 Joules of work while pushing Jeff in 5 seconds, and the force of friction due to the broken toboggan did 2 joules of work, how much work did Alice exert?

Answer 2

it should be how much power did alice exert?

Answer 3

here are the choices

50 W
2 W
1.6 W
1.5 W

Answer 4

\[W - W_{friction} = net~work \]

\[10-2 = 8 J \]

then I knew power was Joules/time

\[\frac{ 8J }{ 5s } = 1.6 W \]

Answer 5

BTW my answer is wrong

Answer 6

Power is the rate of doing work. (P= W/t)

\(Work = F_{applied}• displacement. \)

Work applied by Alice is different from the work applied by the friction. In this problem you are only concerned about Alice's work.

Answer 7

okay so power only applies to the work done by a particular source right?

Answer 8

yeah