Question

Время разгона автомобиля до 90 км/ч составляет 5 с. Определите мощность двигателя к концу пятой секунды. Масса автомобиля равна 1200 кг.

Answer 1

Мощность N= F*V=m*a*V
ускорение автомобиля a= V/t
окончательная формула мгновенной мощности N=m*V^2/t=1200*25*25/5=150000Вт=150 кВт

Answer 2

Calculating Engine Power

To calculate the power of the engine at the end of the fifth second, we can use the formula:

Power = (Work done) / (Time taken)

The work done can be calculated using the formula:

Work done = (Force) * (Distance)

The force can be calculated using the formula:

Force = (Mass) * (Acceleration)

Given: - Time taken to reach 90 km/h = 5 s - Initial velocity = 0 km/h - Final velocity = 90 km/h - Mass of the car = 1200 kg

First, we need to convert the final velocity from km/h to m/s: - 90 km/h = 25 m/s

Now, we can calculate the acceleration: - Acceleration = (Change in velocity) / (Time taken) - Acceleration = (25 m/s - 0 m/s) / 5 s - Acceleration = 5 m/s^2

Next, we can calculate the force: - Force = (Mass) * (Acceleration) - Force = 1200 kg * 5 m/s^2 - Force = 6000 N

Now, we can calculate the work done: - Work done = (Force) * (Distance) - As the distance is not provided, we'll assume it to be the distance covered in 5 seconds at a constant acceleration.

Finally, we can calculate the power: - Power = (Work done) / (Time taken) - We'll use the work done value to calculate the power at the end of the fifth second.

Let's calculate the power.