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Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form = where is the acceleration in ft/s 2 and g c = 32.174 lb·ft/(lbf·s 2).
However, lenses are marked in terms of focal length in millimeters (e.g., average natural human field of view is a lens with 35–50 mm focal length for 35 mm film). The weight of vinyl phonograph records is reported in grams. [58] The tracking force and anti-skating settings on a turntable are measured in grams-force. [59]
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These special coins have been issued in shillings (1958), crowns (1965), pounds (1958–1977), sikas (1997–2003) and cedis (2013–). [17] It is unclear if the Bank of Ghana considered commemorative crowns and sikas together with the commemorative pounds that were coined after 1965 as legal tender or simply as medallions.
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From Boeing's turbulence and a catastrophic hurricane, to Donald Trump's election victory, "Sunday Morning" host Jane Pauley looks back at key events of a year that was monumental.