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A model airplane of mass 0.4 kg is attached to a horizontal string and flies in...

A model airplane of mass 0.4 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.9 m, making 2 revolutions every 7 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the plane.) The accelaration due to the gravity is 9.81 m/s2 . Find the speed of the plane. Answer in units of m/s.

Find the tension in the string. Answer in units of N.

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