- #1

- 38

- 0

## Homework Statement

A loaded truck weighs 16*10^3 lb and accelerates uniformly on a level road from 15ft/s to 30 ft/s during 4 s. If the frictional resistance is 325 lb determine the max power delivered to the wheels.

## Homework Equations

I already know the answer, its 119 HP but I dont know how to get to it.

P= F*V = CHANGE WORK/CHANGE IN TIME

since there is no angle here, and the only force is the friction, I found the acceleration using the speed as funtion of time eq, I got A=3.75, they say accelerates uniformly so I assume that means constant acceleration.

Using the speed as a function of position equation I found the change in X to be 90 ft.

i know that KEintial+work due to friction=KE final

So Work = FF*distance, so 325*90, divided by 4 seconds to get power. Then divided by 550 to get to HP.

HELP, Im messing up somewhere, probably with the weight of the truck.:b:yuck: