Question

Из Москвы в Петербург, расстояние между которыми 600км, одновременно вышел поезд со скоростью 100км/ч и вылетела муха со скоростью 300км/ч. Муха, долетев до Питера, возвращается к экспрессу, встретив его, поворачивает вновь к Питеру и т. д. Сколько км налетает муха? Какова будет ее средняя скорость и ее среднепутевая скорость?

Answer 1

1200 километровм налетает муха,ну как и сказанно в задаче 300 км/ч-средняя скорость 

Answer 2

Distance and Speed Calculation

To calculate the distance covered by the fly, we need to determine the time it takes for the fly to reach the train and turn back. Let's break down the problem step by step:

1. The distance between Moscow and St. Petersburg is given as 600 km. 2. The train leaves Moscow with a speed of 100 km/h. 3. The fly leaves Moscow and flies towards the train with a speed of 300 km/h. 4. The fly continues flying until it reaches the train, then it turns back towards St. Petersburg.

To find the time it takes for the fly to reach the train, we can use the formula:

Time = Distance / Speed

The time taken by the fly to reach the train can be calculated as:

Time = 600 km / (300 km/h + 100 km/h)

Let's calculate the time taken by the fly to reach the train:

Time = 600 km / 400 km/h = 1.5 hours

Distance Covered by the Fly

Now that we know the time it takes for the fly to reach the train, we can calculate the distance covered by the fly during this time. Since the fly is flying towards the train at a speed of 300 km/h, the distance covered by the fly can be calculated as:

Distance = Speed x Time

Distance = 300 km/h x 1.5 hours = 450 km

Therefore, the fly covers a distance of 450 km before reaching the train.

Average Speed of the Fly

To calculate the average speed of the fly, we need to consider the total distance covered by the fly and the total time taken. The fly covers a distance of 450 km in 1.5 hours. Therefore, the average speed of the fly can be calculated as:

Average Speed = Total Distance / Total Time

Average Speed = 450 km / 1.5 hours = 300 km/h

Therefore, the average speed of the fly is 300 km/h.

Average Velocity of the Fly

The average velocity of an object takes into account both the magnitude and direction of its motion. Since the fly changes its direction when it reaches the train and turns back towards St. Petersburg, its average velocity will be zero. This is because the fly's displacement is zero, as it returns to its starting point.

Therefore, the average velocity of the fly is zero.

In summary: - The fly covers a distance of 450 km before reaching the train. - The average speed of the fly is 300 km/h. - The average velocity of the fly is zero.

Please let me know if there's anything else I can help you with!