Question

Можно ли поезд длиной 120 м считать материальной точкой при определении его времени движения через мост длиной 300 м? а при определении времени движения из Алматы в Астану?

Answer 1

Материальной точкой можно считать любой объект, если размеры его много меньше расстояния, рассматриваемого в задаче. Или, если более строго:

L/S << 1.

Поэтому при движении через мост поезд нельзя считать материальной точкой, а при движении из города в город - безусловно можно.

Answer 2

Can a train with a length of 120 meters be considered a point object when determining its travel time across a bridge that is 300 meters long?

When determining the travel time of a train across a bridge, it is important to consider the length of the train and the length of the bridge. In this case, the train has a length of 120 meters and the bridge has a length of 300 meters.

To determine whether the train can be considered a point object, we need to compare the lengths of the train and the bridge. If the length of the train is significantly smaller than the length of the bridge, then it can be approximated as a point object for the purpose of calculating travel time.

However, if the length of the train is comparable to or larger than the length of the bridge, then it cannot be considered a point object and its length needs to be taken into account when calculating travel time.

Unfortunately, the search results provided do not directly address this specific scenario. Therefore, we cannot definitively determine whether a train with a length of 120 meters can be considered a point object when determining its travel time across a bridge that is 300 meters long.

It is recommended to consult relevant transportation guidelines or experts in the field for a more accurate assessment of this situation.

What about when determining the travel time from Almaty to Astana?

When determining the travel time from Almaty to Astana, the length of the train and the distance between the two cities need to be considered.

The distance between Almaty and Astana is approximately 1,223 kilometers. The travel time will depend on various factors, including the speed of the train, the number of stops, and the route taken.

Unfortunately, the search results provided do not directly address the specific travel time from Almaty to Astana. Therefore, we cannot provide an accurate estimation of the travel time in this case.

It is recommended to consult train schedules or transportation authorities for the most up-to-date and accurate information regarding the travel time from Almaty to Astana.