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11. 12. 13. 14. 15. In problem 10, if we replace gold with lead and the density of lead is 0.01134 kg/cm3; nd the mass of the lead brick in grams. If the mass of the Earth is 5.96 X 1024 kg and its radius is 6370 km, what is its density in g/cms? If the mass of the Sun is 1.99 x 1030 kg , and a neutron star has a radius of 10 km and it is twice as massive as the Sun, what is its density in g/cm3? If the surface area of the Moon is 3.7915 x 107 rm2 and its mass is 7.348 x 1022 kg, calculate its density and compare it with that of the Earth found in problem 12. The mass of the proton is 1.007276 u. Convert this number into grams and Picograms