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1 godzinę temu · The theory that the Sun is the center around which the planets orbit was first proposed by the ancient Greek ... could be used to trigonometrically determine the distances between Earth, Venus, and the ... Analemma – Diagrammatic representation of Sun's position over a period of time; Antisolar point – Point on the celestial ...
1 dzień temu · Introduction. When a body is free to rotate around an axis, torque must be applied to change its angular momentum.The amount of torque needed to cause any given angular acceleration (the rate of change in angular velocity) is proportional to the moment of inertia of the body.Moments of inertia may be expressed in units of kilogram metre squared (kg·m 2) in SI units and pound-foot-second ...
1 dzień temu · The exponential function is defined on the entire domain of the complex numbers.The definition of sine and cosine can be extended to all complex numbers via = = + These can be reversed to give Euler's formula = + = When plotted on the complex plane, the function for real values of traces out the unit circle in the complex plane.. When is a real number, sine and cosine ...
1 dzień temu · Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now." Italian-American physicist Enrico Fermi's name is associated with the paradox because of a casual ...
1 dzień temu · Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia.It is the largest country in the world by area, extending across eleven time zones and sharing land borders with fourteen countries. It is the world's ninth-most populous country and Europe's most populous country.Russia is a highly urbanized country including 16 population centres with over a million ...
1 dzień temu · High Speed 2 (HS2) is a high-speed railway which is under construction in England.The route will be between Handsacre, in southern Staffordshire, and London, with a spur to Birmingham.HS2 is to be Britain's second purpose-built high-speed railway after High Speed 1, which connects London to the Channel Tunnel.The majority of the project is planned to be completed between 2029 and 2033.
1 dzień temu · Pennsylvania (/ ˌ p ɛ n s ɪ l ˈ v eɪ n i ə / ⓘ, lit. ' Penn's forest country '), officially the Commonwealth of Pennsylvania (Pennsylvania Dutch: Pennsylvanie), is a landlocked state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.Pennsylvania borders Delaware to its southeast, Maryland to its south, West Virginia to its southwest ...
