A helicopter of mass 2000 kg rises with a vertical acceleration of 15 m//s^2. The total mass of the crew and passengers is 500 kg. Give the magnitude and direction of the : Action of the rotor of the helicopter on the surrounding air.

A helicopter of mass 2000 kg rises with a vertical acceleration of 15

1.	A helicopter of mass 2000 kg rises with a vertical acceleration of 15 m//s^2. The total mass of the crew and passengers is 500 kg. Give the magnitude and direction of the : Action of the rotor of the helicopter on the surrounding air.
Answer» Solution :Action of rotor of helicopter on SURROUNDING air is OBVIOUSLY vertically downwards, because helicopter rises on account of reaction of this FORCE. Thus force of action = (2000 + 500) (10 + 15) `= 2500 xx 25` = 62,500 N