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pretty sure that the radius on example 2 is 100mm, and the length is 450mm so it should be 100 + 450=550
You are correct. Good catch! The MOI of the sphere about point O is 4.5975kg m^2. Tot MOI is 5.2725 kg m^2.
For a thin circular disk, shouldn't the mass moment of inertia about the y axis be (1/4)mr^2
The moment of inertia is of a cylinder about its longitudinal axis is (1/2)mr^2. Since the height is not involved in this formula, the disk itself can be thought of as a cylinder.
@@joshuacharlery5826 The MoI of a thin disk about an axis perpendicular to the disk is 1/2 M r^2. hyperphysics.phy-astr.gsu.edu/hbase/tdisc.html
Please can you explain why we are doing 1/2mr^2 first what is the logic?
The MOI of a flat disk is 1/2 m r^2.
pretty sure that the radius on example 2 is 100mm, and the length is 450mm so it should be 100 + 450=550
You are correct. Good catch! The MOI of the sphere about point O is 4.5975kg m^2. Tot MOI is 5.2725 kg m^2.
For a thin circular disk, shouldn't the mass moment of inertia about the y axis be (1/4)mr^2
The moment of inertia is of a cylinder about its longitudinal axis is (1/2)mr^2. Since the height is not involved in this formula, the disk itself can be thought of as a cylinder.
@@joshuacharlery5826 The MoI of a thin disk about an axis perpendicular to the disk is 1/2 M r^2. hyperphysics.phy-astr.gsu.edu/hbase/tdisc.html
Please can you explain why we are doing 1/2mr^2 first what is the logic?
The MOI of a flat disk is 1/2 m r^2.