A hemisphere of weight W and radius r is released from rest in the position shown (image 1). Determine for that initial instant: a) The minimum value of the coefficient of static friction µx for which the hemisphere begins to roll without sliding. b) The corresponding acceleration of point B. Hint: Note that OG= (3/8)r and that, by the parallel axes theorem IG=(2/5)mr2-m(OG)2.

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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.