Решение задачи по физике раздел 52 пункт 98 механика

98. Helicopter mass m = 3.5T with a rotor diameter d is equal to 18 m, "hanging" in the air. What is the speed υ rotor drops vertically down the stream of air? The diameter of the jet considered equal to rotor diameter

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)