The 12-lb uniform disk shown has a radius of r = 3.2 in. and rotates counterclockwise. Its center C is constrained to move in a slot cut in the vertical member AB, and an 11-lb horizontal force P is applied at B to maintain contact at D between the disk and the vertical wall. The disk moves downward under the influence of gravity and the friction at D. Knowing that the coefficient of kinetic friction between the disk and the wall is 0.12 and neglecting friction in the vertical slot, determine (a) the angular acceleration of the disk, (b) the acceleration of the center C of the disk.

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A:

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A:

Q: The 200 mm-radius brake drum is attached to a larger flywheel. The total mass moment of inertia of…

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A: calculated the number of revolutions executed by the flywheel before it comes to rest.

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A:

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Q: 3) A 50-lb spool with outer radius of 15 inches, inner radius of 9 inches, and moment of inertia of…

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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.