Answer :

(a) From the diagram, the force on the floor(F) is given by:



Where m is the mass of the crew and a is the upwards acceleration.



(b) Here, we have to consider all the weight if the system. The force due to rotor Fr is:




(c) This force is just the reaction force of Fr. So the force due to surrounding air is 6.25 x 104 N.



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