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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 : Radius of the resulting circular motion

A proton accelerates from rest through 1500 volts. the proton then enters a region of space where the magnetic field is 0.3 tesla (and this field is perpendicular to the velocity). calculate the radius of the resulting circular motion?