Question

Какая работа должна быть совершена для остановки поезда массой 1000 т. движущегося со скоростью 108 км/ч. помогите пожалуйста т.т

Answer 1

Eк=A
Ek=m*U^2/2
Ek=1000 000*900/2=450 000 000 Дж=450 МДж

Answer 2

Calculating the Stopping Distance of a Train

To calculate the stopping distance of a train, we can use the formula:

Stopping distance = Reaction distance + Braking distance

Where: - Reaction distance is the distance the train travels from the moment the brakes are applied until the train actually begins to slow down. - Braking distance is the distance the train travels while it is slowing down.

Reaction Distance Calculation

The reaction distance can be calculated using the formula:

Reaction distance = Speed × Reaction time

Given: - Speed of the train = 108 km/h - Reaction time (assumed to be 1 second)

We can calculate the reaction distance using the given speed and assumed reaction time.

Braking Distance Calculation

The braking distance can be calculated using the formula:

Braking distance = (Initial speed^2) / (2 × Deceleration)

Given: - Speed of the train = 108 km/h - Mass of the train = 1000 tons (or 1,000,000 kg) - Deceleration due to braking (assumed to be 0.72 m/s^2)

We can calculate the braking distance using the given speed, mass of the train, and assumed deceleration due to braking.

Final Calculation

Once we have calculated the reaction distance and braking distance, we can add them together to find the total stopping distance of the train.

Let's calculate the reaction distance and braking distance using the given parameters.