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Scientific notation with the correct number

The mass of Earth is 5.98 x 10^24 kg, and the mass of a single proton is 1.673 x 10^-27 kg. Assuming Earth is made entirely of protons, use an order-of-magnitude calculation to estimate the number of protons that make up Earth. Then, calculate the exact number of protons and express the answer in scientific notation with the correct number of significant digits.

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## Q : Calculate the approximate radius of the gold nucleus

A gold nucleus contains 197 nucleons packed tightly against each other. A single nucleon (proton or neutron) has a radius of about 1.310-15 m. Calculate the approximate radius of the gold nucleus. (Hint: Remember that the volume of a sphere is (4