- Reflection, refraction, diffraction, interference and superposition in physics?

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I m an important concept and I have three main points the last is that all cells come from exiting cells? A pipe delivers 239 gallons of water a minute. If the velocity of the water is 27 ft/s what is the diameter of the pipe? Have you ever lived through a hurricane? The surface x^2+y^2=4 can be described using spherical coordinates in the form
ρ=? The 2.5 kg , 34-cm-diameter disk is spinning at 340 rpm . How much friction force must the brake apply to bring the disk to a halt in 2.3 s?