- If airplane didn't produce any sound, would it sill make a boom when breaking the sound barrier?

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Prove that for all n>=9 that there exist natural numbers x,y s.t. n=2x+5y.? Let A be a constant vector A = (Ax)i + (Ay)j + (Az)k and r = xi + yj + zk. How do you calculate the gradient? What kind of mentality has rattlesnakes or cobras as pets? Adipic acid HOOC(CH2)4COOH (mm 146.26g/mol) is used in making nylon. What is the total number of atoms in 1.0g of adipic acid? Describe the physical properties of copper sulfate pentahydrate & anhydrous copper sulfate. Describe what happens and explain why it happens?