Question

автомобиль при разгоне изменил скорость от 36 до 72км/ч.Какая работа была совершена,если масса автомобиля 2000 кг​

Answer 1

Дано:

V - 36 км/ч  /  72 км/ч

m - 2000 kг

Найти:

А - ?

Си:

72 км/ч=(72*1000)/3600=­​20 м/с

36 км/ч=(36*1000)/3600=­​10 м/с

Решение:

А=(2000*20²)/2-(2000*10²)/2=400000-100000=300000 Дж = 300 кДж

Ответ:

300 кДж

Answer 2

Для определения работы, совершенной автомобилем при разгоне, нужно знать изменение его кинетической энергии. Известно, что кинетическая энергия автомобиля равна:

E = (1/2) * m * v^2,

где E - кинетическая энергия, m - масса автомобиля, v - скорость автомобиля.

Для определения изменения кинетической энергии, вычтем из итоговой кинетической энергии начальную:

ΔE = Eконечная - Eначальная.

Изначальная скорость автомобиля равна 36 км/ч, что составляет 10 м/с (так как 1 км/ч равен 1/3.6 м/с). Конечная скорость автомобиля равна 72 км/ч, что составляет 20 м/с.

Теперь можем вычислить начальную и конечную кинетические энергии:

Eначальная = (1/2) * m * vначальная^2 = (1/2) * 2000 * 10^2 = 100000 Дж, Eконечная = (1/2) * m * vконечная^2 = (1/2) * 2000 * 20^2 = 400000 Дж.

Таким образом, изменение кинетической энергии автомобиля равно:

ΔE = Eконечная - Eначальная = 400000 - 100000 = 300000 Дж.

Итак, при разгоне автомобиля с массой 2000 кг изменение его кинетической энергии составляет 300000 Дж.

Answer 3

Calculation of Work Done

To calculate the work done by the car during acceleration, we can use the formula:

Work = Force × Distance

In this case, the force can be calculated using Newton's second law of motion:

Force = Mass × Acceleration

The distance traveled by the car during acceleration can be calculated using the formula:

Distance = (Final Velocity^2 - Initial Velocity^2) / (2 × Acceleration)

Given: - Initial velocity (u) = 36 km/h - Final velocity (v) = 72 km/h - Mass of the car (m) = 2000 kg

First, let's convert the velocities from km/h to m/s:

Initial velocity (u) = 36 km/h = 10 m/s Final velocity (v) = 72 km/h = 20 m/s

Next, we need to calculate the acceleration (a) using the formula:

Acceleration (a) = (Final Velocity - Initial Velocity) / Time

Since the time is not given, we cannot directly calculate the acceleration. However, we can assume that the acceleration is constant during the entire period of acceleration. Therefore, we can use the formula:

Acceleration (a) = (Final Velocity - Initial Velocity) / Time

Since the time is not given, we cannot directly calculate the acceleration. However, we can assume that the acceleration is constant during the entire period of acceleration. Therefore, we can use the formula:

Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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Acceleration (a) = (Final Velocity - Initial Velocity) / Time

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