Question

A helicopter of mass 1000kg rises with a vertical acceleration of 15m/sec square.the crew and the passengers weigh 300kg. Give the magnitude and direction of action of rotor of helicopter on the surrounding air

Answer 1

Force applied by rotor on surrounding= (m+M)g + (m+M)a
=(1000+300)10 + (1000+300)15
=32500 N
this force is in the downward direction