![]() ![]() ![]() Note that a shift in any object’s mass on the Earth relative to its axis of rotation will change its moment of inertia, although most shifts are too small to be measured (but they can be calculated). It would shift the pole position by about two centimeters (0.8 inch). NASA scientists calculated that shift of such as mass would increase the length of day by only 0.06 microseconds and make the Earth only very slightly more round in the middle and flat on the top. However, the effect would extremely small. Raising 39 trillion kilograms of water 175 meters above sea level will increase the Earth’s moment of inertia and thus slow its rotation. Similarly, a diver attempting to somersault faster will bring his body into a tucked position. For example, a figure skater attempting to spin faster will draw her arms tight to her bodies, and thereby reduce her moment of inertia. You may not know it, but you see examples of this in everyday life. The longer the distance of a mass to its axis of rotation, the slower it will spin. The moment of inertia of an object about a given axis describes how difficult it is to change its angular motion about that axis. That water will weigh more than 39 trillion kilograms (42 billion tons).Ī shift in a mass of that size would affect the rotation of the Earth due to a phenomena known as the moment of inertia, which is the inertia of a rigid rotating body with respect to its rotation. The reservoir will contain about 39.3 cu km (9.43 cubic miles) of water. The total surface area of the reservoir is 1045 square kilometers, and it will will flood a total area of 632 square kilometers, of land. When the water level is maximum at 175 meters (574 ft) over sea level (91 meters (299 ft) above river level), the reservoir created by the dam is about 660 kilometers (410 mi) in length and 1.12 kilometers (0.70 mi) in width on average. It the world’s largest hydroelectric power station by total capacity, which will be 22,500 MW when completed. The Evidence: Three Gorges Dam, China crosses the Yangtze River in Hubei province, China. They quoted the National Institute of Geophysics and Volcanology in Italy, that estimated that 'the 8.9-magnitude quake shifted the planet on its axis by nearly 4 inches (10 centimeters).' Astronomers concur that there has not been a shift in the earth's rotational axis, but that there have been subtle polar shifts over the last ten years. ![]() Account icon An icon in the shape of a person's head and shoulders. ![]()
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