Sinar_Matahari
Well-known member
Here is the place to ask for help with chemistry, biology, physics, engineering, earth sciences etc....
Science Help
- Thread starter Sinar_Matahari
- Start date
Lord Baltimore
Well-known member
Freaking bombed my chemistry class back in high school. I was pretty good in biology tho. Are you asking for help or are you giving help??
Sinar_Matahari
Well-known member
This thread is for anyone who needs help. I am not in school, but I may need the information one of these days.
Sinar_Matahari
Well-known member
MaliceInWickedland
Well-known member
I've always had a special place in my heart for science. I was really good at it, especially Biology, up until Chemistry. That killed me... Anything with math and formulas in it is potentially going to kill my grade :
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Luke1993
Well-known member
Two science questions I have always wondered about relating to firearms....
If you shot a gun in space would it work?
and
Let's say you were sitting on a train that travelled at exactly 100 mph. You have a gun that shoots a bullet at a velocity of exactly 100 mph. If you shot the gun in the direction the train was going in, would it look like the bullet was floating in mid air (since both the bullet and the train are travelling at the ame speed)?
If you shot a gun in space would it work?
and
Let's say you were sitting on a train that travelled at exactly 100 mph. You have a gun that shoots a bullet at a velocity of exactly 100 mph. If you shot the gun in the direction the train was going in, would it look like the bullet was floating in mid air (since both the bullet and the train are travelling at the ame speed)?
1st dimension
New member
Yes the firearm will work in space, The speed of the train will cause the bullet to travel at 200 mph. Shooting in space or in a train may not go over so well with the authorities.
hoddesdon
Well-known member
Yes, shooting a gun in space would work, as long as the mechanism used to create the explosion did not involve fire (which can not exist in space due to lack of oxygen). The projectile would travel faster than on Earth since there is no resistance from the atmosphere.
Presumably the bullet would not look like it were floating in mid-air, since passengers are aware of the forward motion of the train, and so the bullet must also be travelling forward in order to maintain the same position relative to the train.
Presumably the bullet would not look like it were floating in mid-air, since passengers are aware of the forward motion of the train, and so the bullet must also be travelling forward in order to maintain the same position relative to the train.
hoddesdon
Well-known member
I think he meant firing the bullet from a position outside the train.
Luke1993
Well-known member
hehe thanks for your answers guys! I've been thinking about something else, another gun question I'm afraid lol.
In lots of films and video games, you see cars getting blown up after being shot with guns, usually it's when they aim at the fuel cap. So would a car actually blow up in real life if you shot at it with x amount of bullets?
In lots of films and video games, you see cars getting blown up after being shot with guns, usually it's when they aim at the fuel cap. So would a car actually blow up in real life if you shot at it with x amount of bullets?
Dronee
1
I'm serious about this question. I'll put it up on yahoo answers and other sites, but I wonder if anyone knows the answer to the above... Basically, I want to know how to clear a continually stuffy nose. I've read that saline solutions and 'nasal irrigation' are supposed to be the best methods... any ideas?
Have you already seen an allergist to find out what you're reacting to? I'm looking to get an appointment with a specialist myself soon. I have constant sinus problems myself, and it really blows.
ikbenrifi
Well-known member
hello everyone
i got a question similar to the bullet one !
let's consider a flying fly in a bus, my question is will it hit the end of the bus, because the fact that the bus is moving or it will stay in the middle of the bus space ?
hope i made the question clear for you guys
i got a question similar to the bullet one !
let's consider a flying fly in a bus, my question is will it hit the end of the bus, because the fact that the bus is moving or it will stay in the middle of the bus space ?
hope i made the question clear for you guys
Um, not really sorry. :
:What's the speed and direction of the bus? What's the speed and direction of the fly?
DanFC
Well-known member
I thought this was more for school-related problems, since, you know, we are regularly too shy to ask?
That being said, if anyone knows anything about (especially in terms of the mechanisms involved) converting 4-nitroaniline into 4-bromonitrobenzene, about preparing diethylamine from ethyl acetate, Suzuki coupling, alkene metathesis, or the Diels-Alder reaction, let me know...
That being said, if anyone knows anything about (especially in terms of the mechanisms involved) converting 4-nitroaniline into 4-bromonitrobenzene, about preparing diethylamine from ethyl acetate, Suzuki coupling, alkene metathesis, or the Diels-Alder reaction, let me know...
ikbenrifi
Well-known member
Um, not really sorry. :
What's the speed and direction of the bus? What's the speed and direction of the fly?
any direction you choose, doesn't matter, concerning the fly, it's in the center of the bus when it's not moving !
the question is: will the fly remain in its position when the bus moves ?
hope you understand now ? hehe
JosephG
Well-known member
I do English Chemistry so I'm not too sure because we use IUPAC chemical nomenclature. But I looked up 4-nitroaniline and we would call it 1-amino-4-nitrobenzene.
I would assume it would perhaps be a nucleophilic substitution reaction? The Nitrogen of the amino group would be drawing the electron density of the carbon on the benzene ring towards it therefore making the carbon partially positive. This would leave it open to nucleophilic attack.
The diatomic bromine molecule has instantaneous dipole-dipole moments (or wan der waals forces) thus making one end partially negative. I assume that a nucleophilic substitution reaction would ensue in which the bromine atom would replace the amino group. And then the remaining bromine atom would combine with the NH2 to form NH2BR.
Not totally sure whether that's right but it seems the most logical way forth from my perspective... if that's any help?
Also I think I can get to that ester using diethylamine and an acyl compound but I'm not too sure what the reverse is....
The above is an educated guess
Correct me if I'm wrong atall...
Ah, okay. If the fly isn't moving independently of the bus, it will stay in the center of the bus so long as the speed and direction of the bus remain constant.
It's the same as riding in a car. If you're going 90 miles an hour in a straight line, you won't feel anything. But if the car hits a cement block and suddenly stops, your momentum will throw you forward. If the car speeds up, you feel pushed back. Car turns left, you're pushed right, and so on.