$17.$ A $6200$ kg helicopter lifts a $960$ kg dome connected via a mass$-$

less cable. During the process, the helicopter accelerates upward at

$0\mathrm{.}90$m$/$s$2.$

$($a$)$ Determine the force exerted by the turbulent air on the heli$-$

copter blades?

$($b$)$ Find the tension in the massless cable which connects the dome

to the helicopter?

$($c$)$ Calculate the force exterted by the cable on the helicopter?