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J. Perelman
"Entertaining physics". Book 2.
Chapter 5. Journey into the cannon projectile

FANTASTIC GUN

And here are the members of the Gun club cast a giant gun, the length of a quarter of a kilometer, sheer dug into the earth. Produced respectively a huge bomb, which internally represents the cabin for passengers. Weight of 8 tons. Load a gun cotton gunpowder - pyroxylin - in the amount of 160 tons. The explosion of the projectile, according to the novelist, acquires a speed of 16 km per second, but due to friction of the air speed, this is reduced to 11 km per second. Thus, once outside the atmosphere, Jules-cavities, the projectile has a velocity sufficient to reach the moon.

So is described in the novel. What can say about this physics?

The project Jules Verne vulnerable not at the point where usually goes doubts of the reader. First, it is possible to prove (I prove it in the book "Interplanetary travel")that the powder gun will never be able to tell the shells a speed greater than 3 km per second.

In addition, Jules Verne ignored with air resistance, which at such great speed must be very high and will completely change the picture of the flight. But apart from this there are serious objections to the project flight to the moon in the artillery projectile.

The main concern is the fate of the passengers. Do not think that the danger to them during the flight from earth to the moon. If they managed to stay alive to the moment when they leave the muzzle of a gun, during the journey they had nothing more to fear. The enormous speed with which passengers will race in the world along with their car, as harmless as harmless to us, the inhabitants of the Earth, the greater speed with which the earth is hurtling around the Sun.

Entertaining physics J. Perelman

 




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