- #1
sozener1
- 19
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Homework Statement
the gear ratio between crankshaft and driveshaft calculates to be 13.579 at first gear
the diameter of the car wheel is 0.6m
the transmission efficiency is 0.85
weight of the car is 1200kg
if the engineer is running at 1500rpm how do you calculate the speed in km/hr generated by the engine
Homework Equations
The Attempt at a Solution
since gear ratio is 13.579 I multiplied it to 1500 rpm then by 60 to get revolutions per hour
and I multiplied result by (0.6*pi) to obtain the distance it traveled in an hour.
then I get something like 2000km/hr which I think is ridiculously high?
so I tried to divide 1500rpm by the gear ratio and then calculated, then I get somting like 12km/hr which I think is too low.
what have I done wrong