The speedboat B is cruising to the north at 81 mi/hr when it encounters an eastward current of speed vc = 9 mi/hr but does not change its heading (relative to the water). Determine the subsequent velocity of the boat relative to the wind and express your result as a magnitude vrel and compass direction 0 measured clockwise from north. The current affects the motion of the boat; the southwesterly wind of speed vw = 16 mi/hr does not. 28 B Uw Answers: Vrel = i mi/hr i

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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.