# For 3 hours of run the car 25%, consumed 24 kg of gasoline. What is the average power

September 12, 2021 | education

| **For 3 hours of run the car 25%, consumed 24 kg of gasoline. What is the average power of the car’s engine during this run?**

Initial data: t (duration of vehicle run) = 3 hours; η (vehicle engine efficiency) = 25% = 0.25; m (mass of gasoline used) = 24 kg.

Reference data: q (specific heat of combustion of gasoline) = 46 * 10 ^ 6 J / kg.

SI system: t = 3 h = 3 * 3600 s = 10800 s.

The average power developed by the car engine during the run can be expressed from the formula for efficiency: η = Ap / Az = N * t / q * m and N = q * m * η / t.

Let’s perform the calculation: N = 46 * 10 ^ 6 * 24 * 0.25 / 10800 = 25 556 W ≈ 25.6 kW.

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