Archive for the ‘physical science’ Category

Degenerate Matter

Tuesday, 1 June 2010

At Kingdom Kane (a 'blog focussed upon the art of Gil Kane), Mykal Banta has reproduced The Birth of the Atom. a story which contains what I have long regarded as an epitomal sequence of what I call comic-book science: Ray Palmer leaps over a wall in pursuit of a meteor seen in the distance, about to hit the Earth.Ray Palmer excavates a meteor composed of about 1000 cu cm of degenerate matter from a white dwarf star, buried about two feet in the earth. 'So heavy-- I can hardly lift it!'Palmer, holding the meteor, looks at in amazement. 'Puff!'Palmer carries the meteor back to his car. 'Puff!'

As I noted to Mykal, a white dwarf star has a density of about 1 million grams per cc, and the meteor appears to be about 1000 cc, so the whole thing should mass at about 1 million kilograms.

It’s not apparent why 1 million kilograms should stay compressed into such a small volume. In the case of a dwarf star itself, the gravitational mass of the star as a whole creätes sufficient force, but this is just a fractional piece of such a star. It ought to fly apart as a terrible burst of radiation. But let’s assume that this somehow doesn’t happen, that the meteor just stays together in a nifty one-liter piece.

The meteor that creäted Meteor Crater in Arizona was under 30,000 kilgrams. Ray wouldn’t be excavating the meteor at all; he would have been killed by the shock waves from the impact. Those who later did excavate the meteor wouldn’t find it buried just a couple of feet deep.

At the surface of the Earth (which itself masses about 5.97 × 1024 kilograms), this meteor would weigh about 11 hundred tons, but Ray picks it up! He subvocalizes a few puffs, but he manages to carry the thing back to his car! Now-a-days, they don’t make cars that can carry 11 hundred tons. I don’t think that any grad students can lift 11 hundred tons. And, really, Ray ought to be sinking into the ground, as even if he has big feet and has both feet on the ground he is applying over 7000 kPa of pressure to the soil.

It might be suggested that the meteor, while perhaps of material that were once compressed to a density of about 1 million grams per cc, were subsequently uncompressed, and that what Palmer recovered were only, say, 100 kilograms of material. But I don’t know how, then, it would be recognizable as originating from a white dwarf star. For example, the core of the sun compresses matter to a greater density than 100 grams per cc.

D_mn'd Yanquis

Friday, 22 January 2010

Readers of this 'blog might recall the Decimator. Well, according to Hugo Chávez, the United States has one.

I’m just hoping that it doesn’t fall into the wrong hands, and get directed at the Amsterdam Fault. Meanwhile, maybe I can become one of the Rocket Men. At my age, hopes of becoming a super-hero have dimmed, but I at least look younger than Jeff King.

Ball-Parking

Friday, 7 August 2009
To-Day’s Installment of xkcd by Randall Patrick Munroe

The character is drawn about 33 pixels tall. If he’s of average height, then that means that 1 pixel maps to about 2 1/8 in (5.39 cm). The pulley above him is drawn about 431 pixels above ground, which would then be about 76 ft (23.22 m) up.

At 14% of Earth’s gravity, gravitational acceleration on Titan would be at about 4.5 ft (1.37 m) per squared second.

That all means that he hits the ground at about 17.8 mph (28.7 kph) or less. That would be the speed associated with a normal fall of about 10.5 ft (3.2 m).