The work done by a car traveling at a constant speed on a flat road can be computed based on the combined forces of friction. A car is moving with a constant speed of 60.0 mph on a flat road. The combined forces of friction are estimated at 800.0 N. Determine a.the work done during the first 20 minutes of the motion b. the power delivered by the car engine

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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The work done by a car traveling at a constant speed on a flat road can be computed based on the combined forces of friction.

A car is moving with a constant speed of 60.0 mph on a flat road. The combined forces of friction are estimated at 800.0 N. Determine

a.the work done during the first 20 minutes of the motion

b. the power delivered by the car engine

Expert Solution
Step 1

(a)

Calculate the distance travelled in first 20 s.

D = 60*0.447*20                                            (1 mph = 0.447 m/s)

   = 536.4 m

Calculate the work done by friction forces.

Work (W) = Friction force*D

                = 800*536.4

               = 429120 J

              W = 429.12 kJ

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