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Investigation #5

Investigation #5. Agnes and Katrina. The Kinetic Energy of Molecules.

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Investigation #5

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  1. Investigation #5 Agnes and Katrina The Kinetic Energy of Molecules

  2. During the school day there was a great deal of discussion about the hurricane that was approaching the east coast of the U.S. Over the night and into the next day the storm raged across the Delmarva Peninsula, though weakened by making landfall in North Carolina it was still very powerful. As everyone went back to school the next day, students noticed that roads had been damaged by the water and that several trees had been knocked over. Hurricanes are an excellent example of extraordinary amounts of GPE and KE. Where do hurricanes get their energy?

  3. Hurricane facts • Total Energy stored in actions of air/rain = 5.2 x 1019 Joules/day • This is equivalent to 200 times the world-wide electrical generating capacity! • Just wind: 1.3 x 1017 Joules/day

  4. For strong storms the wind works on… • The water, creating a storm surge, similar to a continuous tsunami • The storm surge for Katrina max out at 27.8 feet

  5. Hurricanes and energy • Cause of hurricanes

  6. Hurricanes and energy • Some of this energy takes the form of GPE of the huge quantities of water droplets that make the clouds of the hurricane. • Imagine GPE stored in the mass of water in a ‘puddle’ that is a foot deep and covers the entire State of Delaware, lifted a mile or so up in the air

  7. KE and Hurricanes • Huge quantities of air are propelled at speeds that approach or exceed 100 mi/hr. • When the hurricane makes landfall, the KE of the air and water is transferred to trees, buildings, power poles, cars, boats, and anything else in the hurricane’s path.

  8. Source of GPE and KE of a Hurricane • Hurricanes form in the warm waters of the tropics. • The storms draw their energy from the heat energy stored in these waters

  9. Main goal • In this activity, you will learn how the KE of tiny particles of matter, called molecules, can be used to explain the heat energy that fuels these storms, the water waves that transfer their fury, and the kinetic energy of their devastating winds.

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