SOLUTION: Fiof the volume of the rim of flywheel, its mean radius being 5cm its section being a square whose side is 2 cm , assume pi =3.1412

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Question 857974: Fiof the volume of the rim of flywheel, its mean radius being 5cm its section being a square whose side is 2 cm , assume pi =3.1412
Answer by KMST(5328) About Me  (Show Source):
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With a rim thickness of 2 cm, and an average radius of 5 cm,
the radius of the outside of flywheel must be 5cm + 2cm/2= 6cm,
and the inner edge of the rim must be 5cm - 2cm/2= 4cm from the axle.
The rim is a 2-cm tall 6-cm diameter cylinder with a 4-cm circulat hole in the middle.
The volume of the 2-cm tall 6-cm diameter cylinder is
pi%2A%286cm%29%5E2%282cm%29=pi%2A36%2A2cm%5E3=72picm%5E3 .
The volume of the 4-cm hole is
pi%2A%284cm%29%5E2%282cm%29=pi%2A16%2A2cm%5E3=32picm%5E3 .
The volume of the rim is the difference. In cubic centimeters, it is
72pi-32pi=40pi
Using pi=3.1412 , the volume of the rim of the flywheel is
125.648cm%5E3 .