The wooden cube was pressed to the bottom of the aquarium and released. How will the potential energy of the cube change when it floats to the surface of the water? How will the potential energy of the water in the aquarium change? How will the total potential energy of the cube and water change?
The potential energy of the cube increases as it increases. height above the ground. The potential energy of the water decreases because the water occupies the volume previously occupied by the cube, which has a lower mass than the displaced volume of water. The total potential energy of the cube and the ox decreases, because the mass of water in the volume of the cube is greater than the mass of the cube.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.