Question

ПОМОГИТЕ СРОЧНО !!! Автомобиль , двигаясь равномерно и горизрнтально , проехал 288 км , со скоростью 72км/ч и израсходовал 70кг бензина. КПД двягателя автомобилья = 25% . Определите N двигателя и модуль F силы сопротивления движению автомобиля . ПОМОГИТЕ СРОЧНО

Answer 1

T=S/V=288/72=4 ч
кпд=N*t/q*m
N=q*m*кпд/t=44*10^6*70*0,85/4*3600=181*10^3 Вт=181 кВт
F=N/V=181/20=9,05 кН

Answer 2

Calculation of Engine Power (N) and Resistance Force (F)

To determine the engine power (N) and the module of the resistance force (F) of the car, we can use the following formulas:

1. Engine Power (N): - Engine Power (N) = Work Done (W) / Time (t) - Work Done (W) = Force (F) * Distance (d) - Time (t) = Distance (d) / Speed (v)

2. Resistance Force (F): - Resistance Force (F) = Mass (m) * Acceleration (a) - Acceleration (a) = Speed (v) / Time (t)

Let's calculate the values step by step.

Step 1: Calculation of Time (t)

The car traveled a distance of 288 km with a speed of 72 km/h. To calculate the time taken, we can use the formula:

Time (t) = Distance (d) / Speed (v)

Substituting the given values: Time (t) = 288 km / 72 km/h

Calculating the result: Time (t) = 4 hours

Step 2: Calculation of Work Done (W)

The work done by the engine can be calculated using the formula:

Work Done (W) = Force (F) * Distance (d)

We need to find the force (F) first.

Step 3: Calculation of Force (F)

The force can be calculated using the formula:

Force (F) = Mass (m) * Acceleration (a)

We need to find the acceleration (a) first.

Step 4: Calculation of Acceleration (a)

Acceleration can be calculated using the formula:

Acceleration (a) = Speed (v) / Time (t)

Substituting the given values: Acceleration (a) = 72 km/h / 4 hours

Calculating the result: Acceleration (a) = 18 km/h^2

Step 5: Calculation of Force (F)

Using the formula: Force (F) = Mass (m) * Acceleration (a)

We need to find the mass (m) first.

Step 6: Calculation of Mass (m)

The mass can be calculated using the formula:

Mass (m) = Fuel Consumption (C) / Fuel Density (ρ)

Given that the fuel consumption is 70 kg and the fuel density is not provided, we cannot calculate the mass (m) without this information.

Unfortunately, without knowing the fuel density, we cannot proceed with the calculation of the force (F) and, consequently, the engine power (N) and resistance force (F) of the car.

Please provide the fuel density value so that we can continue with the calculation.