A small rescue helicopter has four blades, each with a length of 4.00 m and a mass of 50.0 kg, as shown in the figure. The blades can be approximated as thin rods that rotate about one end of an axis perpendicular to their length. The helicopter has a total mass of 1000 kg. a) Calculate the rotational kinetic energy in the blades when they rotate at 300 rpm. b) Calculate the translational kinetic energy of the helicopter when flying at 20.0 m/s. c) To what height could the helicopter be raised if all of the rotational kinetic energy could be used to lift it? 4.0 m

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A small rescue helicopter has four blades, each with a length of 4.00 m and a mass of
50.0 kg, as shown in the figure. The blades can be approximated as thin rods that rotate
about one end of an axis perpendicular to their length. The helicopter has a total mass of
1000 kg.
a) Calculate the rotational kinetic energy in the blades
when they rotate at 300 rpm.
b) Calculate the translational kinetic energy of the
helicopter when flying at 20.0 m/s.
c) To what height could the helicopter be raised if all of the
rotational kinetic energy could be used to lift it?
4.0 m
Transcribed Image Text:A small rescue helicopter has four blades, each with a length of 4.00 m and a mass of 50.0 kg, as shown in the figure. The blades can be approximated as thin rods that rotate about one end of an axis perpendicular to their length. The helicopter has a total mass of 1000 kg. a) Calculate the rotational kinetic energy in the blades when they rotate at 300 rpm. b) Calculate the translational kinetic energy of the helicopter when flying at 20.0 m/s. c) To what height could the helicopter be raised if all of the rotational kinetic energy could be used to lift it? 4.0 m
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