Me and my friend try to design stupid machine, need info? ?

Question

ok once this has been answered i'll tell you how all these things relate:

what is the average weight of a male and female (i mean human, for all those pedantic out there, keep up the good work ; ))

what is the weight of the moon

what is the density of steel

what is the highest amount of rpm achieved by a man made engine including jet turbines and stuff like that.

generally at what speed would a human impacting with water disintegrate or come close to disintegrating (been squashed to about the thickness of a pancake by surface tension is good too)

and just for comparison how many joules was produced when the largest atomic bomb went off.

answer all these and you get best answer and explanation of what the h**l we are thinking of making (well not actually making but lathing over, man we're sadistic).

Answer 1

1 million tons of TNT contains 4.2E15 joules of energy. So the largest atomic bomb ever tested was 60 megatons, or 2.5E17 joules.

When Mythbusters dropped Buster into water from a height of 100 feet, he was utterly destroyed. So you can compute the velocity from that.

The highest RPM ever attained was a small diameter magnetically levitated steel needle, which was spun up to 60 million RPM before the centrifugal force caused it to fail.

Answer 2

Ok, to curious not to answer, I'll try my best here

Average weight of a human is 70 kg (assume 50% male/female and all adult)

Best guess on moon weight is 7.3 x 10^22 kg

Density of steel, depends on which type but I'll choose mild A2 tool steel, its about 6 g/cc

Highest RPM?  That's a tough one, I'd say it must be in a gyroscope of some kind or one of the energy storing devices that is being worked on.  Turbocharges get up to 300,000 rpm and I think some drills crak 500k.  To answer this you need to know what you are revolving (size, material, construction) and it what medium (vacuum, air, fluid) it is moving in.  The upper limit of any system is going to be its material, even the best balanced and most rigid frame with be worthless when the rotational forces (centripidal) tear the material itself apart, you would need the yield strength of what it is made out of.  Definately need to know the size, bigger it is the worse the rotational forces get.

Te hperson question is a weird one, I've hit the water at 60 mph and it HURTS and you can be hurt.  If you fall out of an airplane you'd max at 180 mph or so, I think a few people have survived that (even hitting the ground!).  So, I'd guess 200 mph, probably depends on angle of entry and wether skipping is allowed and what protective clothing is applied

The largest atomic weapon used on the earth was the Tsar bomb in russia that yeilded approx 50 megatons, which is about 2.1 x 10^17 joules.  It was actually capable of twice that but was scaled back to reduce fallout.  I'm sure you could design even bigger ones now (it was set off in 1961)

Ok, best answers I know of......