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Gopalasamudram Ramachandran (born 8.10.1922) is an Indian physicist and biophysicist, a member of the Indian Academy of Sciences (1950), its vice-president in 1962 — 64.

Chandrasekhara Venkata Raman (7.02.1888 — 21.11.1970) was an Indian physicist, a member of the Indian Academy of Sciences, its founder and president (from 1934).

Carl Ramsauer (6.02.1879-24.12.1955) was a German physicist.

William Ramsay (2.10.1852-23.07.1916) was an English chemist and physicist, a Fellow of the Royal Society (1888).

Jesse Ramsden (6.10.1735-5.11.1800) was an English mechanic and optician, a well-known maker of physical instruments, and a Fellow of the Royal Society (1786).

Norman Foster Ramsey (born 27.08.1915) — an American experimental physicist, member of the National Academy of Sciences (1952).

William John Macquorn Rankine (5.07.1820-24.11.1872) was a Scottish engineer and physicist, one of the creators of technical thermodynamics, and a Fellow of the Royal Societies of Edinburgh (1850) and London (1853).

Franco Dino Rasetti (born 10.08. 1901) —an Italian experimental physicist and palaeontologist, a member of the Accademia dei Lincei (1937).

Sergei Glebovich Rautian (born 18.12.1928) is a Soviet physicist and a corresponding member of the USSR Academy of Sciences (1979).

John William Rayleigh (Strutt) (12.11.1842 —30.06.1919) was an English physicist and a Fellow of the Royal Society (1873), its president in 1905–08.

René Antoine Ferchault de Réaumur (28.02.1683-18.10.1757) was a French naturalist and a member of the Paris Academy of Sciences (1708).

Karl Karlovich Rebane (born 11.04.1926) is a Soviet physicist, an academician of the Academy of Sciences of the Estonian SSR (1967) and its president (from 1973), and a corresponding member of the USSR Academy of Science…

Erich Rudolph Alexander Regener (12.11.1881—27.02.1955) was a German experimental physicist.

Tullio Regge (born 11.07.1931) is an Italian theoretical physicist and a corresponding member of the Accademia dei Lincei (1972).

Frederick Reines (born 16.03. 1918) is an American experimental physicist and a member of the National Academy of Sciences.

Units of length m km cm mm μm nm 1 m 1 10 -3 100 10 3 10 6 10 9 1 km 10 3 1 10 5 10 6 10 9 10 12 1 cm 0.01 10 -5 1 10 10 4 10 7 1 mm 10 -3 10 -6 0.1 1 10 3 10 6 1 μm 10 -6 10 -9 10 -4 10 -3 1 10 3 1 nm 10 -9 10 -12 10 -7…

Units of power W kW MW kgf·m/s erg/s hp 1 W 1 10 -3 10 -6 0.102 10 7 1.36·10 -3 1 kW 10 3 1 10 -3 10 2 10 10 1.36 1 MW 10 6 10 3 1 1.02·10 5 10 13 1.36·10 3 1 kgf·m/s 9.81 9.81·10 -3 9.81·10 -6 1 9.81·10 7 1.33·10 -2 1 e…

Osborne Reynolds (23.08.1842- 21.02.1912) was an English physicist and engineer and a Fellow of the Royal Society (1877).

Owen Willans Richardson (26.04.1879—15.02.1959) was an English physicist and a Fellow of the Royal Society (1913).

Georg Wilhelm Richmann (22.07.1711 — 6.08.1753) was a Russian physicist and an academician (1741).

Burton Richter (born 22.03.1931) is an American experimental physicist and a member of the National Academy of Sciences (1977).

Carl Viktor Eduard Riecke (1.12.1845-11.06.1915) was a German physicist.

Augusto Righi (27.08.1850-8.06.1921) was an Italian physicist and a member of the Accademia dei Lincei (1898).

AIM OF THE EXPERIMENT: To determine how the position of the wings decides which way the helicopter turns.

Johann Wilhelm Ritter (16.12.1776—23.01.1810) was a German physicist and chemist and a member of the Bavarian Academy of Sciences (1804).