Question

A 70.-kilogram cyclist develops 210 watts of

power while pedaling at a constant velocity of
7.0 meters per second east. What average force is
exerted eastward on the bicycle to maintain this
constant speed?
(1) 490 N (3) 3.0 N
(2) 30. N (4) 0 N

Answer 1

The Definition of Potence is given by:


`P=Fv`

Entering the unknowns:


`P=Fv \\ 210=7F \\ F= (210)/(7) \\ \boxed {F=30N}`

Number 2

If you notice any mistake in my english, please let me know, because i am not native.