Question

Помогите плиз, по физике: Приведите примеры, когда тело: а) плавает на поверхности жидкости, б) плавает, полностью погрузившись в жидкость, в) тонет. Объясните их, используя условие плавания тел.

Answer 1

А) если плотность- P тела меньше P жидкости (дерево в керосине)

Б)если P тело одинаково с P жидкости(деревянный шар наполовину заполненный песком плавающий в воде )

В)Р тела больше Р жидкости (металлический шар в воде)

Answer 2

Examples of Buoyancy in Different Scenarios

a) When an object floats on the surface of a liquid: - An example of this is a wooden block floating on water. This occurs when the weight of the water displaced by the block is equal to the weight of the block itself, leading to a state of equilibrium where the block neither sinks nor rises.

b) When an object floats while completely submerged in a liquid: - A submarine floating underwater is a good example of this. The submarine's overall density is less than the density of the liquid it displaces, allowing it to float while fully submerged. This is in accordance with the principle of buoyancy, where the upward force exerted by the liquid on the submerged object is equal to the weight of the liquid displaced by the object.

c) When an object sinks in a liquid: - A heavy stone sinking in water is a classic example of this scenario. When the weight of the object is greater than the weight of the liquid it displaces, the object sinks due to the greater downward force acting on it compared to the upward buoyant force exerted by the liquid.

The principle of buoyancy, as described by Archimedes' principle, states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. This principle helps explain the behavior of objects in different states of flotation or submersion in a fluid.