Answer :
At an altitude of 50,000 meters, where the air density is 1.03 x 10-3 kg/m3, a meteor with a diameter of 2 mm and a specific gravity of 2.9 is moving at a speed of 6 km/s. The meteor will slow to 5 km/s if the drag coefficient at this large number condition is 1.5.
Specific gravity, often known as relative density, is the measurement of a substance's density in relation to a reference substance. Water is frequently used as a benchmark when comparing the densities of solids like rock and liquids since it has a density of one kilogram per litre at 4 °C (39.2 °F) (62.4 pounds per cubic foot).The density of dry air, which is frequently used to compare gases, is 1.29 grams per litre at standard circumstances (0 °C and 1 standard atmosphere) (1.29 ounces per cubic foot). For instance, the density and specific gravity of liquid mercury are 13.6 kg/l and 13.6, respectively. The gas carbon dioxide has a specific gravity of 1.53, which is greater than its standard density of 1.976 grams per litre (1.976/1.29). The concepts of buoyancy, or an object's tendency to float in water or the atmosphere, and specific gravity are connected.
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