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# (Solved): Extensive testing of an experimental 2170-lb automobile reveals the aerodynamic drag force F_(D) an ...

Extensive testing of an experimental

`2170-lb`

automobile reveals the aerodynamic drag force

`F_(D)`

and the total nonaerodynamic rolling- resistance force

`F_(R)`

to be as shown in the plot. Determine (a) the power required for steady speeds of

`27and54m(i)/(h)r`

on a level road, (b) the power required for a steady speed of

`54m(i)/(h)r`

both up and down a 4-percent incline, and (c) the steady speed at which no power is required going down the 4-percent incline. Answers: (a) Level Road:

`v=27m(i)/(h)r`

`P=`

i hp

`v=54m(i)/(h)r`

,

`P=`

hp (b)

`4%`

incline: up at

`54m(i)/(h)r`

,

`P=`

hp down at

`54m(i)/(h)r,P=`

hp (c)

`4%`

incline: no power needed,

`,v=`

`m(i)/(h)r`

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