Consider two sinusoidal sine waves traveling along a string, modeled as y1 (x, t) = 0.3 m sin (4 m−1 x − 3 s−1 (t)) and y2 (x, t) = 0.3 m sin (4 m−1 x + 3 s−1 (t)). What is the wave function of the resulting wave? [Hint: Use the trig identity sin(u ± v) = sin u cos v ± cos u sin v

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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.