Answered

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

Verified Answer :

The Definition of Potence is given by:

\(P=Fv\)
 
     Entering the unknowns:

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

Number 2

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

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