homework help 2904.
The supplied by the 60.0-kg person is 560 W.
Power is done over time and is measured in watts, W . ##1″W”=1″J/s”##. Work is force applied over a distance, and is measured in Joules, J . ##1″J”=1 “N”*”m”##.
##P=(Fxxd)/t##
Given/Known
##F=mg=(60.0″kg”xx9.81″m/s”^2″)=588.6 N”##
##d=”4.0 m”##
##t=”4.2 s”##
Unknown
##”Power”: P##
Solution
Substitute the given/known values into the equation for power and solve.
##P=(588.6″N”xx4.0″m”)/(4.2″s”)##
##P=560(“N”*”m”)/s”=”560″J”/”s”=560 “W”## (rounded to two significant figures)
