To apply the principle of superposition to overlapping waves, you should of the individual waves. a) add the wavelengths b) multiply the frequencies c) add the vector displacements d) add the frequencies sound travels at a speed of 344 m/s through air at 20°c. what is the second harmonic of an open pipe of length 1.40 m filled with air at 20°c? 123 hz 246 hz 492 hz 377 hz

The answer is d I believe

I'd go for the one that says that knees are fulcrums, lower legs are levers and the ankles hold loads.hope it ,happy homework/ study/ exam!

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached