Find the gas mileage of a car for 1 kilometer at a speed of 60 kilometers per hour. Engine power 17 kW
| August 10, 2021 | education
Find the gas mileage of a car for 1 kilometer at a speed of 60 kilometers per hour. Engine power 17 kW, engine efficiency 30%.
S = 1 km = 1000 m.
V = 60 km / h = 16.7 m / s.
N = 17 kW = 17000 W.
q = 4.6 * 107 J / kg.
Efficiency = 30%.
m -?
Efficiency = A * 100% / Q – definition for the efficiency of a car engine.
A = N * t.
We express the driving time of the car by the formula: t = S / V.
A = N * S / V.
Q = q * m – heat during gasoline combustion ..
Efficiency = N * S * 100% / V * q * m.
m = N * S * 100% / V * q * efficiency.
m = 17000 W * 1000 m * 100% / 16.7 m / s * 4.6 * 107 J / kg * 30% = 0.073 kg.
Answer: when driving, the car consumes gasoline m = 0.073 kg.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
