Sat Jan 22, 2005 10:26 pm
Kalathalan wrote:Alright people, let's get cracking.
I have this Science project due Wednesday 1/26. I have to design two submarines and build one. It has to be able to float barely on the surface of a very-close-to-filled aquarium-sized tank, then sink and touch the bottom, then float back up again. There can be a tube going down to it, but there cannot be a cable of any sort to pull it back up. Also, you cannot add or remove anything after it is in the water.
I'm 11. Most of you should've learned about bouyancy in Science.
Why not allow the whole thing to flood with water (makes it sink), and then blow it outside through the tube in order to return to surface?
It's a simple enough design -- a can of cola (except for it'd be nice to have a transparent can) with two holes: one for the tube (should be water-tight), and one below the waterline (allows water to come in).
If you leave the end of the tube open, water will flow into the craft, allowing it to sink. If you close the other end of the tube with your finger, no more water would flow in (air pressure) -- it stays level. If you blow hard enough (try this), water will actually be forced out, and it'll return to surface.
All of this is wasted, however, if you count air as "something" that you add or remove.
Mon Jan 31, 2005 3:46 pm
i hope you guys can help me in english class i'm doing a project and i need info about carry concealed weapons and i'm on the pro side so i'm saying that carrying concealed weapons reduces crimes and etc.
so if you guys could help thanks alot
so if you guys could help thanks alot
Mon Jan 31, 2005 4:56 pm
Well, you can do a google search to find out what states have concealed carry laws. And you can go to the FBI's web site to find statistics on violent crime state by state.
Wed Feb 02, 2005 12:02 am
shapu wrote:Well, you can do a google search to find out what states have concealed carry laws. And you can go to the FBI's web site to find statistics on violent crime state by state.
You might look into Texas State version of FBI's info page as the recently had an issue on this and re-approving of concealed wepon laws do to school shooting so they may have something useful.
Wed Feb 02, 2005 11:58 am
EDIT: doesnt matter, i've handed the work in now anyway
Last edited by Rachel on Fri Feb 04, 2005 7:08 pm, edited 1 time in total.
Fri Feb 04, 2005 10:52 am
Alex has maths homework which she's confused on. Guess who gets to help her?! Yep, you There's 4 I can't do, but I'll just post 2 (I'll bug dad later ;D)
The problem is, I *know* I can work this out... I just can't get my mind around it.
Again, like the last -- I know I'm able to do it... I just can't.
If you're able to help with either, I will love you forever
There's 4 I can't do, but I'll just post 2 (I'll bug dad later ;D)
A biathlon event involves running and cycling. Kim can cycle 30 km/h faster than she can run. If Kim spends 48 minutes running and a third as much time again cycling in an event that covers a total distance of 60 km, how fast can she run?
The problem is, I *know* I can work this out... I just can't get my mind around it.
A tea wholesaler blends together three types of tea that normally sell for $10, $11 and $12 per kilogram. If the same amounts of the two higher priced teas are used, calculate how much of each type must be used in the blend.
Again, like the last -- I know I'm able to do it... I just can't.
If you're able to help with either, I will love you forever
Fri Feb 04, 2005 2:34 pm
I'm not ignoring you or anything r4che1, it's just that science really isn't my thing and I don't even know what you're talking about. o_o
Let x = how fast she can run (km/hr). That means that (x+30) would equal how fast she can cycle. She spent 48 minutes (.8 = 8/10 hours) running and a third of that time cycling (16 minutes = 8/30 hours)
That would give you something like this:
(8/10)x + (8/30)(x+30) = 60
(8/10)x + (8/30)x + 8 = 60
(32/30)x = 52
x = 48.75
Er. By any chance, did you/your teacher leave part of it out?
When I have to solve these kinds of problems, it usually gives something like the total price of the blend in addition.
A biathlon event involves running and cycling. Kim can cycle 30 km/h faster than she can run. If Kim spends 48 minutes running and a third as much time again cycling in an event that covers a total distance of 60 km, how fast can she run?
Let x = how fast she can run (km/hr). That means that (x+30) would equal how fast she can cycle. She spent 48 minutes (.8 = 8/10 hours) running and a third of that time cycling (16 minutes = 8/30 hours)
That would give you something like this:
(8/10)x + (8/30)(x+30) = 60
(8/10)x + (8/30)x + 8 = 60
(32/30)x = 52
x = 48.75
A tea wholesaler blends together three types of tea that normally sell for $10, $11 and $12 per kilogram. If the same amounts of the two higher priced teas are used, calculate how much of each type must be used in the blend.
Er. By any chance, did you/your teacher leave part of it out?
When I have to solve these kinds of problems, it usually gives something like the total price of the blend in addition.
Sat Feb 05, 2005 12:43 am
Thanks for the help with the first one 
As for the second... my bad, I didn't type it up correctly. The correct one:
As for the second... my bad, I didn't type it up correctly. The correct one:
A tea wholesaler blends together three types of tea that normally sell for $10, $11 and $12 per kilogram so as to obtin 100 kilograms of tea worth $11.20 per kilogram. If the same amounts of the two higher priced teas are used, calculate how much of each type must be used in the blend.
Sat Feb 05, 2005 1:01 am
Hope this helps...
Let x = the # of kilograms of the $11 tea and the $12 tea. Then...
11x = the total price of the $11 dollar tea (in the mix)
12x = the total price of the $12 dollar tea (in the mix)
10(100-2x) = the total price of the $10 dollar tea (100 ... the # of kilograms - the number of kilograms already taken, which is 2x because one x for the $11 and one for the $12)
Then....
11x + 12x + 10(100-2x) = 1120 = total price of the 100 kilograms of tea.
23x + 1000 - 20x = 1120
3x = 120
x = 40
This means you've got 40 kilgrams of $11 tea and 40 kilograms of $12 tea and 20 kilograms of $10 tea...
Plug that back in...
11(40) + 12(40) + 10(20) = 440 + 480 + 200 = 1120
Then you divide by 100 to get the price of 1 kilogram of tea and you get $11.20, which was what you wanted.
A tea wholesaler blends together three types of tea that normally sell for $10, $11 and $12 per kilogram so as to obtin 100 kilograms of tea worth $11.20 per kilogram. If the same amounts of the two higher priced teas are used, calculate how much of each type must be used in the blend.
Let x = the # of kilograms of the $11 tea and the $12 tea. Then...
11x = the total price of the $11 dollar tea (in the mix)
12x = the total price of the $12 dollar tea (in the mix)
10(100-2x) = the total price of the $10 dollar tea (100 ... the # of kilograms - the number of kilograms already taken, which is 2x because one x for the $11 and one for the $12)
Then....
11x + 12x + 10(100-2x) = 1120 = total price of the 100 kilograms of tea.
23x + 1000 - 20x = 1120
3x = 120
x = 40
This means you've got 40 kilgrams of $11 tea and 40 kilograms of $12 tea and 20 kilograms of $10 tea...
Plug that back in...
11(40) + 12(40) + 10(20) = 440 + 480 + 200 = 1120
Then you divide by 100 to get the price of 1 kilogram of tea and you get $11.20, which was what you wanted.
Sat Feb 05, 2005 3:11 am
I love you both
...Any chance I can hire either of you to do my homework?
...Any chance I can hire either of you to do my homework?
Tue Feb 08, 2005 4:44 am
What's the difference in usage between Shiite and Shia? And how would I use them correctly?
Tue Feb 08, 2005 9:28 pm
Smart Duck wrote:What's the difference in usage between Shiite and Shia ? And how would I use them correctly?
Shiites is plural for Shia.
A Shia is singular.
When you are taking about a group of Shia's, you would say Shiites. The actual section of Islam which is split into three sections (Suni, Soufi, Shiites -- I apologise for my spelling, I'm taking religion in French.) is called "Shiites".
Is this a little clear?
Wed Feb 09, 2005 3:38 am
I think that helped.... I'm doing a speech for compitition and it deals alot with Iraq and the Sunnis, Kurds, and Shiites. I was thinking Shia was plural for Shiite, but that wouldn't explain Shiites, with an S............
Tue Feb 15, 2005 3:39 am
Oi...this genetics stuff is confusing me. Dihybrids and Punnett squares, and I'm not sure whether I'm supposed to mix sex-linked characteristics (colourblindness, for example) in there- especially since albinism seems to be a "plain" characteristic, if you get what I mean.
"A woman who is a carrier of the albino allele marries a colour blind man who is also a carrier of the albino allele. The woman is not a carrier of the allele for colourblindness. Completely describe the possible genotypes and phenotypes of their children and the theorietical ratios in which they will occur.
Then, repeat the question except that the woman is now a carrier of the allele for colourblindness."
Any help would be much appreciated.
[edit] Oops, spelling mistake. O_o Serves me right for not looking up when typing.
"A woman who is a carrier of the albino allele marries a colour blind man who is also a carrier of the albino allele. The woman is not a carrier of the allele for colourblindness. Completely describe the possible genotypes and phenotypes of their children and the theorietical ratios in which they will occur.
Then, repeat the question except that the woman is now a carrier of the allele for colourblindness."
Any help would be much appreciated.
[edit] Oops, spelling mistake. O_o Serves me right for not looking up when typing.
Last edited by Yoshi on Wed Feb 16, 2005 7:43 am, edited 1 time in total.
Wed Feb 16, 2005 4:21 am
Err...Which is dominant and recessive? and is it like XxYY by XXyy or more plain and simple like Tt by TT, oh it's sex linked...hehe...let's see then, wait is albinism sex linked also? wait...scratch that...can't be or the male wouldn't be able to be carrier
Okay I'm thinking that 2 boys not colorblind, and 2 daughters are carrierrs
because it affects the x chromosome so let's say x-is the infected trait
XX is the mother...and xY is the father...so punnett square gets what is above
for the other part,
Xx is the mother since she's a carrier and has two it doesn't show up... xY since the father is colorblind since he doesn't have a nother x to cover it up and punnett square it gets this:
1 boy colorblind, 1 boy not, 1 girl carrier, 1 girl colorblind
as for albinism, it can't be sex linked or male can't be carrier....so it's recessive because if it's dominant then no carriers allowed so it'll be
Aa by Aa because both parents are carriers
so 25% normal, 50% carriers, and 25% albinism
Genetics is so refreshingly fun!
Okay I'm thinking that 2 boys not colorblind, and 2 daughters are carrierrs
because it affects the x chromosome so let's say x-is the infected trait
XX is the mother...and xY is the father...so punnett square gets what is above
for the other part,
Xx is the mother since she's a carrier and has two it doesn't show up... xY since the father is colorblind since he doesn't have a nother x to cover it up and punnett square it gets this:
1 boy colorblind, 1 boy not, 1 girl carrier, 1 girl colorblind
as for albinism, it can't be sex linked or male can't be carrier....so it's recessive because if it's dominant then no carriers allowed so it'll be
Aa by Aa because both parents are carriers
so 25% normal, 50% carriers, and 25% albinism
Genetics is so refreshingly fun!