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When an automobile moves with constant velocity, the power developed in a certain engine is 60.5 hp. What total frictional force acts on the car at 72.3 mi/h ? 1 hp = 746 W and 1 m/s = 2.2374 mi/h. Answer in units of N.

Respuesta :

Answer:

Explanation:

Given

Power delivered by engine [tex]P=60.5\ hp[/tex]

[tex]1\ hp=746\ W[/tex]

[tex]P=60.5\ hp\approx 45,133\ W[/tex]

velocity of automobile [tex]v=72.3\ mi/h[/tex]

[tex]1\ m/s=2.2374\ mi/h[/tex]

[tex]v=32.31\ m/s[/tex]

Power delivered is given by

[tex]P=force\times velocity[/tex]

[tex]Force=friction\ force[/tex]

[tex]45,133=f\cdot 32.31[/tex]

[tex]F=1396.87\ N[/tex]