Question

Автомобиль, имеющий массу 1600кг, мчится по шоссе со скоростью v1=110 км/ч. Если отпустить педаль газа, то в течение Δt=7с его скорость снизится до v2=80км/ч. Динамический коэффициент трения колес о дорогу α=0.02. Чему равна средняя сила сопротивления воздуха F?

Answer 1

Ответ:

а какой это класс? если не секрет скажите

Объяснение:

??

Answer 2

Calculation of the Average Air Resistance Force

To calculate the average air resistance force experienced by the car, we can use the equation:

F = (1/2) * ρ * A * Cd * v^2

Where: - F is the air resistance force - ρ is the air density - A is the frontal area of the car - Cd is the drag coefficient of the car - v is the velocity of the car

To calculate the average air resistance force, we need to determine the values of ρ, A, Cd, and v.

Air Density (ρ)

The air density can vary depending on factors such as altitude and temperature. However, for this calculation, we can assume a standard air density of 1.225 kg/m^3.

Frontal Area (A)

The frontal area of the car is the projected area when viewed from the front. Unfortunately, the given information does not provide the frontal area of the car. Without this information, it is not possible to calculate the average air resistance force accurately.

Drag Coefficient (Cd)

The drag coefficient is a dimensionless quantity that represents the aerodynamic efficiency of an object. Unfortunately, the given information does not provide the drag coefficient of the car. Without this information, it is not possible to calculate the average air resistance force accurately.

Velocity (v)

The initial velocity of the car is v1 = 110 km/h. After releasing the gas pedal, the velocity decreases to v2 = 80 km/h within a time interval of Δt = 7 s.

To calculate the average velocity, we can use the formula:

v_avg = (v1 + v2) / 2

Substituting the given values:

v_avg = (110 + 80) / 2 = 95 km/h

However, to calculate the average air resistance force accurately, we need to convert the velocity from km/h to m/s:

v_avg = 95 km/h * (1000 m/1 km) * (1 h/3600 s) = 26.39 m/s

Conclusion

Unfortunately, without the values of the frontal area (A) and the drag coefficient (Cd), it is not possible to calculate the average air resistance force accurately. These values are essential for determining the aerodynamic characteristics of the car and are required to calculate the air resistance force.

If you have any additional information or if there's anything else I can assist you with, please let me know!