Altitude Speed of Temperature (K) Sound (m/s) Air (m) 500 284.9 338 1000 281.7 336 2000 275.2 332 5000 255.7 320 10,000 223.3 299 15,000 216.7 295 20,000 216.7 295

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Q: illustrated. Based on these data what is the atmospheric pressure at the ocean surface?

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Q: Air V = 5 m /s A = 1 m? Az = 1.5 m?

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Hydrogen Energy

Energy is a quantity that cannot be defined, its existence can only be felt. In simple language, if a system possesses energy, it can do a specific kind of work. There are many forms of energy sources which people can use to obtain work. Solar energy, tidal energy, hydroelectric energy, geothermal energy, wind energy are some of the renewable energy sources which are primarily used for the production of electricity.