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The D string on a certain guitar is 153 N. The string's linear mass density is 0.007 kg/m. What is the speed of the waves on the string? How many square centimeters of galvanized iron are needed to make a 1 metre length of 20cm stopepiped? allow 6cm for the seam? How to solve this 2nd order differential equation x²(d²y/dx²)+4x(dy/dx)+2y=ln x, x>0
using substitution x=e^u? A person stands at 305 m in front of the face of a sheer cliff. If the person shouts, how much time will elapse before an echo is heard? What is the natural vegetation of the San Diego region?