The crane has a boom of length OP= 21 m and is revolving about the vertical axis at the constant rate of 2.5 rev/min in the direction shown. Simultaneously, the boom is being lowered at the constant rate = 0.39 rad/s. Calculate the magnitudes of the velocity and acceleration of the end P of the boom for the instant when it passes the position ß = 22°. Answers: Vp = ap= i i ..... THREE m/s m/s²

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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.