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Sketch or diagram of the
problem, a free-body diagram, a sketch of the positions you are finding the energy or momentum
at, any equations or principles you are using and the work to achieve your calculated result.
A wind turbine is rotating counterclockwise at 1.5 rev/s and slows to a stop in
40 s. Its blades are 20 m in length and can be modelled as thin rods.
a. What is the angular acceleration of the turbine?
b. What is the centripetal acceleration of the tip of the blades at t = 0s.
c. What is the magnitude and direction of the total linear acceleration of the tip of
the blades at t = 0s.
d. There are 3 blades on the turbine. How much torque must the motor apply to stop
the rotation?
e. How much rotational kinetic energy is there before it starts the slow-down.

Sagot :

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