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Q. Carry out the following arithmetic operations: (a) the sum of the measured values 756, 37.2, 0.83 and 2.5. The answer must be in significant digits. Since 2.5 and 0.83 have two significant digits, shouldn't the answer be 800 instead of 797?

Q. A molecule of DNA (deoxyribonucleic acid) is 2.24 µm 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 1.27% upon becoming charged. Determine the effective spring constant of the molecule.

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