posted by Edwin .
A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one revolution every 4 s, the control wire is elevated 30 degrees above the horizontal. Determine (a)the tension in the control wire, (b)the lift on the plane. (g=10m/s^2 and pi^2=10)