2011- 10- 4
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#3
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أكـاديـمـي
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رد: واجب الفيزياء
QUESTIONS
8. Find the order of magnitude of your age in seconds.
7. Calculate the mass of an atom of (a) helium,
(b) iron, and (c) lead. Give your answers in grams. The
atomic masses of these atoms are 4.00 u, 55.9 u, and 207 u,
respectively.
10. A small cube of iron is observed under a microscope. The
edge of the cube is 5.00 ! 10"6 cm long. Find (a) the
mass of the cube and (b) the number of iron atoms in the
cube. The atomic mass of iron is 55.9 u, and its density is
7.86 g/cm3 
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