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Does Your Id Name Have Any Meaning?


BambinA

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My former net nick was Bassnovoselic but after 5 years decided to change, realising that i always travel around the globe on a solo backpacking exploration, the name Explorer comes in mind. It is also the nick i use in my chat rooms as i am a moderator there.

FYI - This nick has got nothing to do with IE browser :o

Explorer :D

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I was into the Mod generation and I miss my Vespa.

TAF............Rain on me.

Quadrophenia - my all time favourite film. Sting, of course, as The Ace Face. I always thought Lambrettas were better looking than Vespas though, and a mate preferred them for riding.

Yep top film for sure, I had the original from the UK....borrowed it to a mate and never seen it again :o

Lambrettas are also good fun, but I do not have much luck with them...keep breaking down.

TAF.....Bell boy gotta keep on riding....bell boy!

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Nice one Bambi.

So tell me, how did you figure that my TV name means i like Mathematics  :D

coz mrbojangles

:D:D

Bambi :o

Ooooohhhhhhh, now i get it :D Silly me :D

Bit slow there Khun Boj... :D

totster :D

Come on Khun Tots, be totally honest with me here mate. Did you know that was why :D Bambi's mind truly works in mysterious ways, me thinks :D

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mrbojangles - Mr Boj who love mathmetic stuff

And for todays lesson boys and girls, we are going to build a rocket. Homework to be handed in to me tomorrow evening.

Let's use an Estes Alpha III, to keep it basic:

Weight: 1.2 ounces empty. I will add 0.7 ounces for the engine.

Diameter: 0.976 inches

Motor: C6-7 (we'll use a big one for this rocket)

Now let's follow the equations above and see what we get:

Compute the Useful Terms

Mass of the rocket M = (weight in ounces)/16/2.2 = (1.2+0.7) / 16 / 2.2 = 0.05398 kg

Area of the rocket: A = pi*r^2 = 3.14*(0.5*0.976/12*0.3048)^2 = 0.000483 m^2

Compute wind resistance factor: k = 0.5*rho*Cd*A = 0.5*1.2*0.75*0.000483 = 0.000217

A C6 motor has a nominal impulse of 10 N-s and thrust of 6 N. The "rating" cited above applies to the impulse, giving us an actual impulse for an Estes C6 of 10*90% = 9 N-s.

Compute the burn time t = I / T = 9 / 6 = 1.5 sec.

The gravitational force = M*9.8 = 0.05398*9.8 = 0.529 newton

Compute My Terms

q = sqrt([T - M*g] / k) = sqrt([6 - 0.05398*9.8] / 0.000217) = 158.8

x = 2*k*q / M = 2*0.000217*158.8 / 0.05398 = 1.277

Now the good stuff:

v = q*[1-exp(-x*t)] / [1+exp(-x*t)]

= 158.8*[1-exp(-1.277*1.5)] / [1+exp(-1.277*1.5)] = 118.0 m/s

if this number doesn't mean anything to you, multiply by 2.237 to get velocity at burn-out in mph: 118.0*2.237 = 264.0 mph! And you won't get a ticket!

yb = [-M / (2*k)]*ln([T - M*g - k*v^2] / [T - M*g])

= [-0.05398 / (2*0.000217)]*ln([6 - 0.05398*9.8 - 0.000217*118.0^2] / [6 - 0.05398*9.8]) = 99.95 m

remember this is the height reached during boost. Multiply by 3.3 to get it in feet: 99.95*3.3 = 329.8 feet.

yc = [+M / (2*k)]*ln([M*g + k*v^2] / [M*g])

= [+0.05398 / (2*0.000217)]*ln([0.05398*9.8 + 0.000217*118.0^2] / [0.05398*9.8])

= 236.8 m = 781.4 feet.

Notice: the rocket goes more than twice as far after the burn as during the burn!

AND THE TOTAL ALTITUDE IS... yb + yc = 329.8 + 781.4 = 1,111 feet :D

:D:D

Wow ! a rocket scientist AND a drunk that dances for tips, (per the song "Mr Bojangles", the Nitty Gritty Dirt Band), :o:D

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mrbojangles - Mr Boj who love mathmetic stuff

And for todays lesson boys and girls, we are going to build a rocket. Homework to be handed in to me tomorrow evening.

Let's use an Estes Alpha III, to keep it basic:

Weight: 1.2 ounces empty. I will add 0.7 ounces for the engine.

Diameter: 0.976 inches

Motor: C6-7 (we'll use a big one for this rocket)

Now let's follow the equations above and see what we get:

Compute the Useful Terms

Mass of the rocket M = (weight in ounces)/16/2.2 = (1.2+0.7) / 16 / 2.2 = 0.05398 kg

Area of the rocket: A = pi*r^2 = 3.14*(0.5*0.976/12*0.3048)^2 = 0.000483 m^2

Compute wind resistance factor: k = 0.5*rho*Cd*A = 0.5*1.2*0.75*0.000483 = 0.000217

A C6 motor has a nominal impulse of 10 N-s and thrust of 6 N. The "rating" cited above applies to the impulse, giving us an actual impulse for an Estes C6 of 10*90% = 9 N-s.

Compute the burn time t = I / T = 9 / 6 = 1.5 sec.

The gravitational force = M*9.8 = 0.05398*9.8 = 0.529 newton

Compute My Terms

q = sqrt([T - M*g] / k) = sqrt([6 - 0.05398*9.8] / 0.000217) = 158.8

x = 2*k*q / M = 2*0.000217*158.8 / 0.05398 = 1.277

Now the good stuff:

v = q*[1-exp(-x*t)] / [1+exp(-x*t)]

= 158.8*[1-exp(-1.277*1.5)] / [1+exp(-1.277*1.5)] = 118.0 m/s

if this number doesn't mean anything to you, multiply by 2.237 to get velocity at burn-out in mph: 118.0*2.237 = 264.0 mph! And you won't get a ticket!

yb = [-M / (2*k)]*ln([T - M*g - k*v^2] / [T - M*g])

= [-0.05398 / (2*0.000217)]*ln([6 - 0.05398*9.8 - 0.000217*118.0^2] / [6 - 0.05398*9.8]) = 99.95 m

remember this is the height reached during boost. Multiply by 3.3 to get it in feet: 99.95*3.3 = 329.8 feet.

yc = [+M / (2*k)]*ln([M*g + k*v^2] / [M*g])

= [+0.05398 / (2*0.000217)]*ln([0.05398*9.8 + 0.000217*118.0^2] / [0.05398*9.8])

= 236.8 m = 781.4 feet.

Notice: the rocket goes more than twice as far after the burn as during the burn!

AND THE TOTAL ALTITUDE IS... yb + yc = 329.8 + 781.4 = 1,111 feet :D

:D:D

Wow ! a rocket scientist AND a drunk that dances for tips, (per the song "Mr Bojangles", the Nitty Gritty Dirt Band), :o:D

Well spotted Cobra. When I joined TV i was listening to the Robbie Williams version of Mr Bojangles (my all time fav song along with Mack The Knife) and because your on the spot to the think of an handle, hey presto :D

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My wife said tonight she is getting annoyed by my constant nose-picking.

I told her that I thought it was polite and ok in Thailand.

She says 'it depends' but not in restaurants where I like to do it.

Charming.

Is Picking Your Nose and Eating it Good For You?

We've all been raised to think that what happens in your nose should stay in your nose, but a leading Austrian doctor wants us to rethink that wisdom. He thinks it's not only O.K. to pick you nose and eat it, he thinks it's good for you!

The Case for Picking Your Nose and Eating It

Professor Dr. Friedrich, a lung specialist in Austria, says picking your nose and eating it is healthy for two reasons:

1) "With the finger you can get to places you just can't reach with a handkerchief, keeping your nose far cleaner."

2) "Eating the dry remains of what you pull out is a great way of strengthening the body's immune system. The nose is a filter in which a great deal of bacteria is collected, and when this mixture arrives in the intestines it works just like a medicine."

Bambi BigB.gifBigB.gif

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I was into the Mod generation and I miss my Vespa.

TAF............Rain on me.

Quadrophenia - my all time favourite film. Sting, of course, as The Ace Face. I always thought Lambrettas were better looking than Vespas though, and a mate preferred them for riding.

Desert boots, foxtails, Lambrettas & Skegness in 1965 :o

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