My 2005 Toyota Echo is only small but it has a drag coefficient of a sport car.

Question

My 2005 Toyota Echo is only small but it has a drag coefficient of a sport car. However it tends to struggle a bit going up the steepest parts of Hill at the 70km/h speed limit. Assume rolling resistance and other forms of resistance are negligible for the first part of this question. a)under these conditions what is my maximum power output.? b)Look up the recommended power output of a Toyota Echo and determine if we were correct to ignore rolling resistance and other forms of resistance in our initial calculations.Explain the answer

Explanation / Answer

a) my maximum power output = 950 * 19.44

                                                   =   18472.22 W

                                                   =   24.771   hp

b)     drag force =   1/2 * 0.29 * 21 * 1.225 * 19.44 * 19.44

                          =    1409.66 N

=>    we were not correct to ignore rolling resistance and other forms of resistance in our initial calculations due to large value of drag force .

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