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The operation consisted of 29 explosions, of which only two did not produce any nuclear yield.Twenty-one laboratories and government agencies were involved. While most Operation Plumbbob tests contributed to the development of warheads for intercontinental and intermediate range missiles, they also tested air defense and anti-submarine warheads with smaller yields.
A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
Although likely never achieving orbit due to aerodynamic drag, the first macroscopic object to obtain Earth orbital velocity was a "900kg manhole cover" propelled by the somewhat focused detonation of test shot Pascal-B in August 1957. The use of a subterranean shaft and nuclear device to propel an object to escape velocity has since been ...
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Atmospheric entry speed of the Galileo atmospheric probe—Fastest controlled atmospheric entry for a human-made object. 66,000: 240,000: 150,000 0.00022: Lower speed bound of the steel plate cap from the Pascal-B nuclear test of Operation Plumbbob. [26] [circular reference] 70,220: 252,800: 157,100 0.00023: Speed of the Helios 2 solar probe ...
Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [ 2 ] but may be constructed from precast concrete , glass reinforced plastic or other composite materials (especially where cover theft is of concern).
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