blike

It's not david (assuming certain conditions). Think about it: The bullet will stop ascending when the force that gravity exerts has finally overcome the force of the charge in the gun. At that point, the bullet's y-velocity is 0 and the bullet is at it's highest altitude. The force of gravity will continue exerting the same force over the same period of time until the bullet hits, and thus, the final velocity will be the negative of the original velocity. intial velocity: y (m/s) veolicty at apex: 0 m/s final velocity: -y (m/s) According to Sir Netwon (in an ideal vacuum): v(t) = vo + at Let's assume a bullet fired from a gun has an initial velocity of 896m/s and we want to know how much time will pass before the bullet starts to fall again (note that the bullet's velocity = 0 at the peak) 0 m/s = 896m/s + -9.8m/s^2(t) t = 91.43s Thus, the bullet will continue upwards for 91.43 seconds before it starts to fall again. With the same equation, we can set the intial velocity = 0 (starting at the peak), and 91.43s fall time. (because a plot of displacement vs. time is symmetrical for a projectile in a vacuum) v = 0m/s + -9.8m/s(91.43s) vfinal = 896m/s

What is this you speak of?

Compaq Presario: 800Mhz 128 MB SDRam 30GB Hard Drive 16MB NVIDIA TNT2 Graphics 4x CD-RW Drive cower in fear.

Truth, but some people prefer it. There are tools available (active topics, new posts) to help you sort out what's new and what's not. But I think you're right.

Dave, I'll post details of my plans here once I figure out what kind of system I want to use.

For this rocket I just used an engine which had a timed ejection built in. However, I'm pretty sure I will be using black powder ejection charges for the next rocket. I found some cheap flashbulbs I can use to spark the powder. I'm going to build a prototype of the ejection system this month, so I'll probably have tons of questions

Oh yea, it is definitely enjoyable even though we didn't get the video. A lot of the fun is designing and building the rocket. The launches are amazing as well. For my next one I'm thinking about adding an altimeter and switching over to wireless video transmission. That rocket was powered on a G-40. I'm going to try and get my hands on some 'H' class engines next time.

I launched the second incarnation of my video rocket today. Initially I tried to spark the ignitor using a 6 volt battery, but it wouldn't fire. Then I hooked it up to my van's battery (in the video), which worked fine. Unfortunately, the rocket suffered a hard impact (you can sort of see at the end of the video). The rocket was quite a few ounces heavier than the parachute was designed for, but I figured it would be fine. Two fins broke off when the rocket touched down. The camera lens was (unwisely designed) protruding a tiny bit from the rocket's nose cone. On impact, the lens came loose from its port on the chipset, which destroyed all the data. So all I have left is the video of the launch we took. The video (right click-save target as): http://www.blike.com/dmrocket/dmr2/launch1.wmv Some Pictures:

Thanks dave!

Yea, the CGI-script I've been using is trash. Dave has a nice one he's whipped up that I'm going to install sometime tomorrow. The syntax should be the same, however.

Crash brought it to my attention that uploading your own avatar was disabled. I just turned it back on. Sorry about that!

Happy Birthday Sucka

Yes, it's time to post your pictures. Just attach it to the post if you don't already have it on the web.

Only certain strands are harmful, most of them are harmless. We all have E. Coli living in our intestines (yummy eh).

ROFL, wrong thread.

Only certain strands are harmful, most of them are harmless. We all have E. Coli living in our intestines (yummy eh).

JM83 is a commonly used one in genetics experiments i believe.

no worries, it was a valid question. we just didn't need the porn description, haha. and to answer, it was probably what you suspected

lol, might want to throw some punctuation in there, it makes it easier to read.

What about newborns? They think for themself, but they don't necessarily have an opinion other than instinct (liking milk, sleep). I know I'm really harping your definitions here, but finding a suitable one is part of the problem.

What do you mean why? It's been stated several times: Terminal Velocity

Do you then consider someone unconscious or in a coma to be dead?

I saw this on slashdot this afternoon, it's pretty fun to toy with http://www.lpl.arizona.edu/impacteffects/

Tell him to throw a feather upwards and see if it falls as fast as he threw it. It's the same concept. The feather reaches its terminal velocity rather quickly (because of surface area and shape). The bullet has a much higher terminal velocity, but it does have one, and it is much lower than the muzzle velocity.