O‘zbekiston Respublikasi ta’lim muassasalariga o‘qishga qabul qilish bo‘yicha Davlat komissiyasining 2017 yil 12 iyundagi 2-son bayonining 7-ilovasida “2017/2018 o‘quv yili uchun O‘zbekiston Respublikasi ta’lim muassasalariga o‘qishga qabul qilish bo‘yicha…

Ikkita aylana oladigan blok cho`zilmaydigan yengil ip bilan birlashtirilgan. Pastdagi R radiusli blok chetiga nuqtaviy M massa maxkamlangan bo`lib, u ipning bir uchiga biriktirilgan. Ipning ikkinchi uchiga m (m<M) massali yuk osilgan. Sistemaning muvozanat…

Time The unit of time, the second (s), was historically defined in terms of the rota- tion of Earth and was equal to of the mean solar day. However, scientists have observed that the rate of rotation of Earth is gradually slowing down. The second is now defined…

Length The meter (m) is the SI unit of length. Historically, this length was defined as one ten-millionth of the distance between the equator and the North Pole along the meridian through Paris . This distance proved to be difficult to measure accurately.…

Mass The SI unit of mass, the kilogram (kg) was once defined as the mass of one liter of water at 4°C. (A volume of one liter is equal to the volume of a cube 10 cm on an edge.) Like the standards for time and length, the kilogram standard has changed over…