Question

Приближающийся теплоход дал гудок,звук который услышали на мосту через 3с.Спустя 2 минуты теплоход прошел под мостом.Найти скорость движения теплохода.Скорость звука в воздухе считать равным 340 м\ с.

Answer 1

Найдем расстояние от места подачи гудка до моста, зная скорость звука 340 м/с и время распространения звука t1= 3с.
s=vt=340*3=1020 м
найдем скорость теплохода, зная расстояние до моста 1020м и время за которое теплоход преодолел его t2=2 мин=2*60=120 с
V теплохода=S/t2=1020/120=8,5 м/с

Answer 2

Problem Analysis

We are given that a ship sounded a horn, and the sound was heard on a bridge 3 seconds later. After 2 minutes, the ship passed under the bridge. We need to find the speed of the ship.

Solution

To find the speed of the ship, we can use the formula:

Speed = Distance / Time

Let's break down the problem and calculate the distance and time.

1. The time it took for the sound to reach the bridge is given as 3 seconds. 2. The time it took for the ship to pass under the bridge is given as 2 minutes, which is equal to 120 seconds.

Now, let's calculate the distance traveled by the sound and the ship.

1. Distance traveled by the sound: - The speed of sound in air is given as 340 m/s. - Using the formula Distance = Speed × Time, we can calculate the distance traveled by the sound as: Distance = 340 m/s × 3 s = 1020 meters

2. Distance traveled by the ship: - The time it took for the ship to pass under the bridge is given as 120 seconds. - Using the formula Distance = Speed × Time, we can calculate the distance traveled by the ship as: Distance = Speed × 120 s

Now, let's substitute the values and solve for the speed of the ship.

Speed = Distance / Time

Speed = (Distance traveled by the ship) / (Time taken by the ship)

Speed = (Distance traveled by the ship) / 120 s

Speed = (Distance traveled by the sound) / 3 s

Since the distance traveled by the sound is equal to the distance traveled by the ship, we can equate the two equations:

(Distance traveled by the ship) / 120 s = (Distance traveled by the sound) / 3 s

Simplifying the equation:

(Distance traveled by the ship) = (Distance traveled by the sound) × (120 s / 3 s)

(Distance traveled by the ship) = 1020 meters × 40

Now, let's calculate the distance traveled by the ship:

(Distance traveled by the ship) = 1020 meters × 40 = 40800 meters

Finally, let's calculate the speed of the ship:

Speed = (Distance traveled by the ship) / 120 s

Speed = 40800 meters / 120 s

Speed ≈ 340 meters per second

Answer

The speed of the ship is approximately 340 meters per second.

Note: The speed of sound in air is assumed to be 340 m/s