Question

В безветренную погоду на озере из лодки сбросили тяжёлый якорь. От места бросания пошли волны. Стоящий на берегу человек заметил, что волна дошла до него через 20 с, расстояние между соседними гребнями волн 40 см, а за 4 с было 10 всплесков волны о берег. Рассчитайте, как далеко от берега находилась лодка. Нужно решение и ответ

Answer 1

Объяснение:

20+40×4+10=250 вроде бы все нормально

Answer 2

Problem Analysis

We are given the following information: - A heavy anchor was dropped from a boat on a windless lake. - Waves were generated from the point of dropping the anchor. - A person standing on the shore noticed that the wave reached them after 20 seconds. - The distance between adjacent wave crests is 40 cm. - There were 10 wave crests that reached the shore in 4 seconds.

We need to calculate the distance between the boat and the shore.

Solution

To solve this problem, we can use the formula for wave speed:

Wave speed = Wavelength / Time

We know the time it took for the wave to reach the shore (20 seconds) and the number of wave crests that reached the shore in that time (10). We can use this information to calculate the wavelength.

The wavelength is the distance between adjacent wave crests. We are given that the distance between adjacent wave crests is 40 cm. Therefore, the wavelength is 40 cm.

Now, let's calculate the wave speed:

Wave speed = Wavelength / Time = 40 cm / 20 s = 2 cm/s

The wave speed is 2 cm/s.

Next, we need to calculate the distance between the boat and the shore. We can use the formula:

Distance = Wave speed × Time

Substituting the values, we get:

Distance = 2 cm/s × 4 s = 8 cm

Therefore, the boat was 8 cm away from the shore.

Answer

The boat was approximately 8 cm away from the shore.