Assuming you are in low earth orbit with a normal orbital velocity, and you drop 10kg of uranium in the shape of a thin cylinder with a diameter of 10mm and fins for stability, it would hit the ground at around Mach 23 with the kinetic energy roughly equivalent to a Mark 83 thousand pound bomb.
But remember the bomb expends its energy in all directions, whereas the kinetic projectile like our uranium dart expends its energy only in one direction. If it hits soft ground it's barely going to make a puff, and bury itself hundreds of feet.
All in all a fun way to bury nuclear waste.
Note: If you were wanting to make a weird/simplistic bunker busting orbital nuke, you'd need about 15kg of U235 in a dart shape. First 10kg in the forward section, then 5kg in the rear section, the two separated by a layer of lead shielding designed to squeeze out of the way of the 2 parts on impact, with the whole dart encased in a magical perfect neutron reflector.
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from Quora http://ift.tt/2bOSE0N
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