5. The cast iron block with cross-sectional dimensions of 2.5 inches by 2.5 inches consists of two pieces. The pieces are prevented from sliding along the 55° inclined joint by the steel key, which is 2.5 inches long. Determine the smallest safe dimensions b and h of the key if the working stresses are 50 ksi for cast iron in bearing and 60 ksi for the key in shear. 60 kips 2.5 in. Key 55°

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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.