Question

Лабораторная работа №6. Изучение закона Архимеда Щенок легко может вытащить и спасти тонущего ребенка. Но на берегу он не может даже сдвинуть ребенка. Почему? Верных ответов: 2 На берегу на ребенка не действует выталкивающая сила. На берегу вес у ребенка очень большой. На ребенка на берегу не действует сила тяжести. Объем воды очень большой. На ребенка в воде действует выталкивающая сила.

Answer 1

Верные ответы :

1. На берегу на ребенка не действует выталкивающая сила.

2. На ребенка в воде действует выталкивающая сила.

ответ правильный !

Answer 2

Why can a puppy easily pull and save a drowning child but cannot even move the child on land?

When a puppy tries to save a drowning child, it can easily pull the child out of the water. However, on land, the puppy cannot even move the child. This can be explained by the principles of Archimedes' law.

Archimedes' law, also known as the principle of buoyancy, states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. This buoyant force acts in the opposite direction to the force of gravity.

In the case of the puppy and the drowning child, the puppy can easily pull the child out of the water because the buoyant force acting on the child in the water helps counteract the force of gravity. The puppy only needs to exert a force greater than the difference between the buoyant force and the weight of the child to pull the child out of the water.

However, on land, the buoyant force is no longer present because the child is not submerged in a fluid. Without the buoyant force, the weight of the child becomes the dominant force, making it difficult for the puppy to move the child. The weight of the child on land is much greater than the buoyant force acting on the child in water, which explains why the puppy cannot move the child on land.

In summary, the puppy can easily pull and save a drowning child because the buoyant force in water helps counteract the force of gravity. However, on land, where the buoyant force is absent, the weight of the child becomes the dominant force, making it difficult for the puppy to move the child.