The car drove 100 km, consuming 6.9 kg of gasoline. The average power is 13 kW, and the average speed is 75 km / h
| November 25, 2020 | education
The car drove 100 km, consuming 6.9 kg of gasoline. The average power is 13 kW, and the average speed is 75 km / h. It is necessary to find the efficiency of the engine.
Motor efficiency = N * t / q * m
q (gasoline) = 44,000,000 J / kg
p (gasoline) = 750 kg / m ^ 3
n = 13 * 10 ^ 8/21 * 6 * 9 * 44 * 10 ^ 6
n = 1300 / 6375.6 = 0.20
Answer: motor efficiency = 20%
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