Question

Поезд массой 2000 т., двигаясь прямолинейно, увеличил скорость от 54 до 72 км/ч. Вопрос: Найти изменение импульса.

Answer 1

Эту задачу я уже решал И сделал скреншот

Answer 2

Смотри прикрепленный файл 

Answer 3

Calculation of Change in Momentum

To find the change in momentum of a train with a mass of 2000 tons (or 2,000,000 kg) that increases its speed from 54 km/h to 72 km/h, we can use the formula:

Change in momentum = mass × change in velocity

First, we need to convert the speeds from km/h to m/s, as the SI unit for velocity is meters per second (m/s).

Given: - Mass of the train = 2000 tons = 2,000,000 kg - Initial velocity = 54 km/h - Final velocity = 72 km/h

Converting the velocities to m/s: - Initial velocity = 54 km/h = 54 × (1000/3600) m/s = 15 m/s - Final velocity = 72 km/h = 72 × (1000/3600) m/s = 20 m/s

Now we can calculate the change in momentum:

Change in momentum = mass × (final velocity - initial velocity)

Substituting the given values: Change in momentum = 2,000,000 kg × (20 m/s - 15 m/s)

Calculating the change in momentum: Change in momentum = 2,000,000 kg × 5 m/s = 10,000,000 kg·m/s

Therefore, the change in momentum of the train is 10,000,000 kg·m/s.