A ship has portholes to provide light and ventilation to lower decks. When there are large waves on the freshwater lake, the portholes can be submerged by up to 12 feet of water, measured straight down from the surface to the center of the 15 inch diameter porthole. The position of the portholes in calm water is sketched below at left. The position with large waves is shown below at right. Assume the listing angle is 0= 15°. Portholes are shown with the following symbol: 0

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.