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July 5, 2015

Homework Help: Science

Posted by Rob on Wednesday, July 18, 2012 at 8:07pm.

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical
energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s,
how much chemical energy would be needed to move the car a distance of 450 m at this speed?

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