Question

Вагон поезда,движущегося со скоростью 36км/ч , был пробит пулей,летевший перпендикулярно движению вагона. Одно отверстие стенках вагона смещено относительно другого на три см .Ширина вагона-2,7м .Какова скорость движения пули?

Answer 1

Скорость поезда 36 км/час=10 м/сек;
время полета пули в вагоне 0,03/10=0,003 секунды;
скорость пули 2,7/0,003= 900 м/сек

Answer 2

Calculation of the Bullet's Speed

To calculate the speed of the bullet, we can use the principle of conservation of momentum. The momentum of an object is equal to its mass multiplied by its velocity. Since the bullet is moving perpendicular to the motion of the train, we can assume that there is no horizontal component of momentum before or after the collision. Therefore, we can equate the momentum of the bullet before and after the collision.

Let's denote the mass of the bullet as m and the velocity of the bullet as v. The mass of the train is much larger than the mass of the bullet, so we can neglect the change in velocity of the train due to the collision.

Before the collision, the bullet has momentum m * v. After the collision, the bullet is embedded in the train, so the combined mass of the bullet and the train is m + M, where M is the mass of the train. The velocity of the bullet and the train after the collision is V, which is the velocity of the train.

According to the principle of conservation of momentum, we have:

m * v = (m + M) * V

We can rearrange this equation to solve for V:

V = (m * v) / (m + M)

To find the speed of the bullet, we need to convert the velocity V from meters per second to kilometers per hour.

Calculation Steps

1. Convert the speed of the train from kilometers per hour to meters per second. 2. Convert the width of the train from meters to cent