[QUOTE=T2L_Goose;19649487]Are you dumb?
It needs to go that fast to break earths gravitational pull and get into space.
That's not overkill at all.[/QUOTE]
Its times like this we need a zing rating
They should put it in a volcano, that's the only way to ensure it doesn't become a tool for evil geniuses.
I don't believe in this. If you use a cannon to shoot things up, the projectile would have to move 8.2 kilometers per second to achieve the orbit, and 11.2 km/s (40k km/h) to escape from earths gravity field. In reality the speed is much higher because air friction slows it down.
Even at mach 3 (at around 1km/s), a supersonic plane with good aerodynamic capabilities heats up to 300+ celcius because of the aerodynamic heating. For an example aluminium cant handle any more than mach 2.5. And the supersonic planes always fly at higher, thinner atmosphere.
[QUOTE=evlbzltyr;19680607][img]http://img138.imageshack.us/img138/2690/ghey.png[/img][/QUOTE]
stop post
They could launch nuclear waste into space. :haw:
[QUOTE=Maucer;19680500]I don't believe in this. If you use a cannon to shoot things up, the projectile would have to move 8.2 kilometers per second to achieve the orbit, and 11.2 km/s (40k km/h) to escape from earths gravity field. In reality the speed is much higher because air friction slows it down.
Even at mach 3 (at around 1km/s), a supersonic plane with good aerodynamic capabilities heats up to 300+ celcius because of the aerodynamic heating. For an example aluminium cant handle any more than mach 2.5. And the supersonic planes always fly at higher, thinner atmosphere.[/QUOTE]
It doesn't have to survive the flight, (of which only a few seconds are spent in the lower atmosphere) that's what ablation shields are for. Once it gets into space the heat shield's probably going to be in bad shape, but the capsule will be unharmed.
NASA's latest heat shields can survive temperatures of over 15,000 kelvin, three times the temperature of the sun's surface.
[QUOTE=petieng;19686079]It doesn't have to survive the flight, (of which only a few seconds are spent in the lower atmosphere) that's what ablation shields are for. Once it gets into space the heat shield's probably going to be in bad shape, but the capsule will be unharmed.
NASA's latest heat shields can survive temperatures of over 15,000 kelvin, three times the temperature of the sun's surface.[/QUOTE]
NASA's heat shields have one weakness: Frozen Foam.
This thread has me cracking up.
[QUOTE=Maucer;19680500]I don't believe in this. If you use a cannon to shoot things up, the projectile would have to move 8.2 kilometers per second to achieve the orbit, and 11.2 km/s (40k km/h) to escape from earths gravity field. In reality the speed is much higher because air friction slows it down.
Even at mach 3 (at around 1km/s), a supersonic plane with good aerodynamic capabilities heats up to 300+ celcius because of the aerodynamic heating. For an example aluminium cant handle any more than mach 2.5. And the supersonic planes always fly at higher, thinner atmosphere.[/QUOTE]
Air friction has a minimal effect on anything. Drag is more pronounced.
What if them terrorist stole it?
They would kill the president with a fridge from the other side of the world! :science:
[QUOTE=mak364;19667461]does this mean they are going to have a giant net in space to catch the stuff?[/QUOTE]
A giant catcher's mitt.
[QUOTE=Maucer;19680500]I don't believe in this. If you use a cannon to shoot things up, the projectile would have to move 8.2 kilometers per second to achieve the orbit, and 11.2 km/s (40k km/h) to escape from earths gravity field. In reality the speed is much higher because air friction slows it down.
Even at mach 3 (at around 1km/s), a supersonic plane with good aerodynamic capabilities heats up to 300+ celcius because of the aerodynamic heating. For an example aluminium cant handle any more than mach 2.5. And the supersonic planes always fly at higher, thinner atmosphere.[/QUOTE]
With an initial velocity of 8.2 km/s, shooting directly upwards, without air resistance, you would achieve an altitude of 7400 km.
The ISS is 20 times closer than that so I have no idea what you're trying to shoot at. To reach ISS, you'd need to shoot with a velocity of about 2600 m/s.
[QUOTE=ThePuska;19688825]With an initial velocity of 8.2 km/s, shooting directly upwards, without air resistance, you would achieve an altitude of 7400 km.
The ISS is 20 times closer than that so I have no idea what you're trying to shoot at. To reach ISS, you'd need to shoot with a velocity of about 2600 m/s.[/QUOTE]
Even though it would achieve a height of 7400km, it would still be sub-orbital. It's going to fall back down again. You want to shoot the projectile at the right angle and with enough speed that it will fall around the Earth and not back down to it (therefore achieving orbit) to do this, it'll need a velocity of over 7km/s once it gets to the height of the ISS. It could carry an engine to achieve orbit once it's in space, but that would mean carrying alot of fuel and defeats some of the purpose of having the gun.
Even though it would need a speed of about 8km/s, building a heat shield for this is no problem at all.
This could come in handy if aliens ever decide to invade.
[QUOTE=petieng;19690030]Even though it would achieve a height of 7400km, it would still be sub-orbital. It's going to fall back down again. You want to shoot the projectile at the right angle and with enough speed that it will fall around the Earth and not back down to it (therefore achieving orbit) to do this, it'll need a velocity of over 7km/s once it gets to the height of the ISS. It could carry an engine to achieve orbit once it's in space, but that would mean carrying alot of fuel and defeats some of the purpose of having the gun.
Even though it would need a speed of about 8km/s, building a heat shield for this is no problem at all.[/QUOTE]
Oh right I kind of assumed the ISS would just catch it in a net or something but I suppose that it might become a problem when there's a 7.7km/s difference between your velocities
edit: Though the guys up there are quite handy I hear, they might be able to solve it!
[QUOTE=ThePuska;19687115]Air friction has a minimal effect on anything. Drag is more pronounced.[/QUOTE]
Our physics teacher told me aerodynamic drag is actually friction so I assumed it is...
[QUOTE=petieng;19686079].
NASA's latest heat shields can survive temperatures of over 15,000 kelvin, three times the temperature of the sun's surface.[/QUOTE]
Yeah but they're ceramic. Can they last 5000 G's? No way. They might be hard but they're brittle
[QUOTE=winsanity;19686831]This thread has me cracking up.[/QUOTE]I see what you did thar. :D
[QUOTE=Janus Vesta;19690403]This could come in handy if aliens ever decide to invade.[/QUOTE]
yeah because that's been a brimming threat lately
[QUOTE=Kondor;19699354]yeah because that's been a brimming threat lately[/QUOTE]
Well, you never know.
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