The hypersonic kinetic missiles are gonna be awesome, but only Russia will have them. :(
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The US has been using concrete bombs as tank busters for quite a few years now.
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I think that meteors and comets answered this question a LONG time ago. Nobody packed the meteor that hit Arizona with explosives. The hole is 570 ft deep and 4,100 ft across. The asteroid that hit was roughly 130 feet wide. https://www.space.com/834-mystery-arizona-meteor-crater-solved.html …
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And BTW, the largest piece found of it is made of solid chunk of nickel iron alloy or something like that, and it’s only about 3’x1’x1’. That’s all that’s left of it. It’s in the museum at the site.pic.twitter.com/XE1ctqRXco
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Doesn't sound right. Various sources say bomb terminal velocity about 350...450m/s (just over Mach 1). Assume 500kg@450m/s, get 50 MJ. Assume 400kg TNT, energy 400*4.2MJ -> 1680 MJ. 3%, still a lot, huh. But is the kinetic energy released during explosion? ¯\_(ツ)_/¯
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Without explosion, the kinetic E would go towards tearing and deforming the casing & contents, and towards penetrating (deforming) the ground. Assuming (under-)ground burst, most of the energy would probably go towards both anyway. There's a reason bombs use delay fuse.
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Makes me wonder whether the bunker busters in the US arsenal could be improved by replacing the explosive with solid rocket engines and tungsten carbide (WC. Really, that's the formula.) No [real] terminal velocity issues with those…


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"did a calculation once" kind of understates "calculated within 0.1% the effect of dropping multiple railcar-volumes of gravelized granite from lunar orbit to Earth-sea-level, accounting for atmospheric drag" Or will you argue it's not really granite & that changes things?
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