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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-lbautomobile 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)ron a level road, (b) the power required for a steady speed of
54m(i)/(h)rboth 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