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What is the moment of inertia of a solid iron sphere 20 inches in diameter about...

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Physics

  1. What is the moment of inertia of a solid iron sphere 20 inchesin diameter about an axis passing through the sphere half way fromits center to the surface (you will have to look up its density)?If the sphere rolls down an incline plane that makes an angle 20degrees with the horizontal, what will be its acceleration?

b. Derive the formula for acceleration of a circular disk thatrolls down an inclined plane that makes an angle θ with thehorizontal. (draw a diagram and say in words what you aredoing)

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