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Q. A pendulum has a length L = 1.07 m. It hangs straight down in a jet plane about to take off as shown by the dotted line. The jet accelerates uniformly, and during that time, the pendulum oscillates about the equilibrium position shown by the solid line, with D = 0.370 m. Calculate the magnitude of the plane's acceleration.

Q. A molecule of DNA (deoxyribonucleic acid) is 2.02 m long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.00% upon becoming charged. Determine the effective spring constant of the molecule.

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