Two uniform disks A and B, each having a mass of 4k, are connected by a 3kg rod CD, as shown in the figure. A counterclockwise torque M of 4 N*m is applied to disk A. Knowing that the discs roll without slipping, determine the horizontal component of the force that pin D exerts on disc B.   The answer is Dx= 8.66N to the left

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.