Your question cannot be answered with a simple yes or no. The
velocity, weight, and thickness of the car door are critical as is the
shape, density, and hardness of the ammunition. It would be fairly
easy to calculate the kinetic energy of slug as long as you know the
velocity of your high power slingslot. From that you can estimate
your penetrating capability.
In regards to the ammunition, tungsten would be your best bet for a
penetrator. While it may not be as dense as lead, the high hardness
of tungsten will give you better penetration. Nanograined tungsten
penetrators are being evaulated as a replacement for military uranium
rounds. It may be tough to find tungsten bearings, but you could find
scrap ingot you could cut up. You might even consider cemented
tungsten carbide, readily available in bearings, density is only a bit
less that tungsten at 15g/cc.
Yes, I got a little ahead of myself on this one. While the atomic
weight of Pb (lead) is higher than that of W (tungsten), the tighter
atomic packing of the W structure leads to significantly higher
density. Both are cubic structures with a lattice parameter of
3.16angstrom for W and 4.95angstrom for Pb.
In comparison,the density of lead is 11.4g/cc, tungsten is 19.2g/cc,
tungsten carbide 15.5g/cc, platinum is 21.5g/cc, gold is 19.3g/cc, and
if you want to get really exotic iridium is 22.7g/cc, osmium is 22.6,
rhenium is 21.0, whereas depleted uranium is 18.9g/cc. The maximum
density of your projectiles essentially reaches as deep as your
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