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2 problems tagged with center-of-mass in Rotational Motion

Mechanics › Rotational Motion
Mechanics › Rotational Motion

P0642

Beginner Mechanics › Rotational Motion

Center of Mass of Three Touching Disks

Three uniform disks of the same material and thickness have radii $r_1=a$, $r_2=2a$, and $r_3=2a$. They are welded together in a line such that their edges touch, as shown in the diagram.

  1. Find the distance of the center of mass of the system from the center of the smallest disk (radius $a$).
  2. Find the moment of inertia around the center of the disk with radii $r_2=2a$.
center-of-mass

P0645

Intermediate Mechanics › Rotational Motion

Center of Mass of a Disk with Hole

A uniform circular disk has a radius $R$. A circular hole with a radius of $R/2$ is cut from it, tangent to the center and the edge of the original disk.

  1. Find the distance of the center of mass of the remaining part from the center of the original disk.
  2. Find its moments of inertia about an axis at the center of the original disk and perpendicular to the disk
center-of-mass

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