Question

In: Physics

A gasoline engine has a power output of 150 kW. If its thermal efficiency is 33%,...

A gasoline engine has a power output of 150 kW. If its thermal efficiency is 33%, how much heat must be supplied to keep the engine running for 18 s to reach the end of a street? (in J) (Note: express your answer in scientific notation, for instance: 3.14

Solutions

Expert Solution

We know that

Efficiency = E= Pout / Pin

                   Pin = Pout/ E

                          = (150103) / 33%

                  Pinp = (150)(103)(100)/33

                  Pinp =454545.45

                  We know that

                    W=Q= Pinp(18)

                            =(454545.45)(18)

                             =8181818.1J

                           Q =8.6106 J


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