- #1
Naeem
- 194
- 0
A uniform disk of mass Mdisk = 4.4 kg and radius R = 0.28 m has a small block of mass mblock = 2.4 kg on its rim. It rotates about an axis a distance d = 0.18 m from its center intersecting the disk along the radius on which the block is situated.
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a) What is the moment of inertia of the block about the rotation axis?
Iblock = kg*m2
2*0.18*0.18 NO
HELP: Remember: the block is on the rim of the disk.
HELP: The block is considered a point-mass.
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b) What is the moment of inertia of the disk about the rotation axis?
Idisk = kg*m2 *
4.4*0.28^2/2+4.4*0.18^2 OK
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c) When the system is rotating about the axis with an angular velocity of 5 rad/s, what is its energy?
KErot = J
(2.4*0.18^2+4.4*0.28^2/2+4.4*0.18^2)*5.0^2/2 NO
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d) If while the system is rotating with angular velocity 5 rad/s it has an angular acceleration of 8.4 rad/s2, what is the magnitude of the acceleration of the block?
|ablock| = m/s2
((5^2*0.18)^2+(8.4*0.18)^2)^(1/2) NO
Somebody please help!
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a) What is the moment of inertia of the block about the rotation axis?
Iblock = kg*m2
2*0.18*0.18 NO
HELP: Remember: the block is on the rim of the disk.
HELP: The block is considered a point-mass.
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b) What is the moment of inertia of the disk about the rotation axis?
Idisk = kg*m2 *
4.4*0.28^2/2+4.4*0.18^2 OK
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c) When the system is rotating about the axis with an angular velocity of 5 rad/s, what is its energy?
KErot = J
(2.4*0.18^2+4.4*0.28^2/2+4.4*0.18^2)*5.0^2/2 NO
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d) If while the system is rotating with angular velocity 5 rad/s it has an angular acceleration of 8.4 rad/s2, what is the magnitude of the acceleration of the block?
|ablock| = m/s2
((5^2*0.18)^2+(8.4*0.18)^2)^(1/2) NO
Somebody please help!