Question

13.2 У дна сосуда с водой на нити удерживается деревянный шар. Нить оборвалась, и шар всплыл. Как изменилась относительно поверхности стола потенциальная энергия системы сосуд-шар-стол?

Answer 1

Ну вообще потенциальная энергия шара увеличить так как его высота над столом увеличилась, следует из формулы E=mgh.

Answer 2

Changes in Potential Energy of the System

When the wooden ball is held by a thread in a vessel of water, the system of the vessel-ball-table has potential energy due to the gravitational force acting on the ball. When the thread breaks and the ball floats, the potential energy of the system changes.

The potential energy of the system relative to the surface of the table decreases when the ball floats. This is because the ball moves from a higher position (when it was held by the thread) to a lower position (when it floats). The potential energy of the system is directly related to the height of the ball above the surface, and as the ball moves closer to the surface, its potential energy decreases.

The change in potential energy can be calculated using the formula: ΔU = U_final - U_initial Where: - ΔU is the change in potential energy - U_final is the final potential energy of the system - U_initial is the initial potential energy of the system

The change in potential energy can be further calculated using the formula: ΔU = mgh Where: - m is the mass of the ball - g is the acceleration due to gravity - h is the change in height

The specific values for mass, acceleration due to gravity, and the change in height would be needed to calculate the exact change in potential energy.