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Question 494860: 1)The rotor blades of an helicopter are 16ft long and are rotaing at 120rmp.
a)Find the angular speed of the rotor.
b)find the linear speed of a point on the tip of a blade .
2)Find the perimeter of a regular hexagon that is inscribed in a circle of radius 8m.
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! 1)The rotor blades of an helicopter are 16ft long and are rotaing at 120rmp.
a)Find the angular speed of the rotor.
120 rev/min = 120*2*pi radians/min
= 240pi rad/min
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b)find the linear speed of a point on the tip of a blade
The circumference = 16*2*pi feet
Tip speed = 16*2*pi*120 ft/min
= 3840pi ft/min
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That helicopter is not likely to fly at those blade speeds, way too slow.
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2)Find the perimeter of a regular hexagon that is inscribed in a circle of radius 8m.
The central angles are 60 degs, making 6 equilateral triangles with sides of 8 m.
Perimeter = 6*8 = 48 m
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