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| الكتب | الكتب |
 that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances...  Properties of Matter - الصفحة 113 بواسطة Peter Guthrie Tait - 1890 - عدد الصفحات: 332 عرض كامل -
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