Science & Mathematics - 14 October 2007

Do comets have enough gravity to effect the oceans?

2007-10-14 08:55:50 · 4 answers · asked by Philip Augustus 3 in Astronomy & Space

A trough is 16 ft long and its ends have the shape of isosceles triangles that are 3 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 13 ft^3/min, how fast is the water level rising when the water is 9 inches deep?

2007-10-14 08:52:46 · 1 answers · asked by Anonymous in Mathematics

Find the exact roots (algebraically) for the cubic equation x^3-5x^2-7x+51=0 (include a list of all possible integral roots) Support your findings with the graph of an appropriate cubic polynomial, clearly explainging how this graph confirms your algebraic solution:
This is my solution :
x^3-5x^2-7x+51=0
f(-3)=(-3)^3-5(-3)^2-7(-3)+51
=0 therefor (x+3) is a factor

(x^3-5x^2-7x+51) divided by (x+3)
= x^2-8x+17 therefor x^2-8x+17=0 is a factor...
so the following roots are x=-3 and x=+-squareroot -4 all over 2

2007-10-14 08:51:56 · 2 answers · asked by Anonymous in Mathematics

My 6th grader has a project that I am stumped on. It has to be a timer that measures 10 seconds consistently, opperate with little effort, and sturdy. It will be measured on square centimeters, cubic centimeters, and mass they are looking for it to be small and light weight and has to be aesthetically pleasing. Wow they are not asking for much are they and this is only 6ht grade! Thank you for anyone who can help me with any ideas.

2007-10-14 08:51:40 · 1 answers · asked by Shawn 1 in Mathematics

2007-10-14 08:50:30 · 2 answers · asked by thats right give it all to me 2 in Botany

While traveling across flat land, you notice a mountain directly in front of you. The angle of elevation to the peak is 2.5 degrees. After you drive 17 miles closer to the mountain, the angle of elevation is 9 degrees. Approximate the height of the mountain.

2007-10-14 08:49:34 · 3 answers · asked by yoursmilemakesme 2 in Mathematics

When 194 mL water at 34°C is mixed with 78 mL water at 69°C, what is the final temperature? (Assume that no heat is lost to the surroundings and that the density of water is 1.00 g/mL.)

explination would be nice, answer is fine too.

2007-10-14 08:48:33 · 1 answers · asked by Anonymous in Chemistry

I need help with a school project for science. I need to create a model submarine that floats for 1 minute, sinks to the very bottom of the tank and then comes back up. It doesn't have to look nice, just work. It can not be directly pulled up or down

2007-10-14 08:45:04 · 3 answers · asked by rocknrolln_angel 1 in Engineering

If someone could give a little help on this problem I'd really appreciate it. I've been trying to solve this for 2 hours.
yz=n(2y+2z)+4µ
xz=n(2x+2z)+4µ
xy+n(2x+2y)+4µ
2xz+2xy+2yz=1500
4x+4y+4z=200

2007-10-14 08:43:15 · 1 answers · asked by Anonymous in Mathematics

it wants me to state the points at which the curve crosses the X axis, and or state the equations of any asymptotes.

so the function that is being applied is f(x)=1/x

the questions is - a, f(x+2)



Can someone do it, step by step.
its the 1/x that that is bugging me

2007-10-14 08:40:11 · 1 answers · asked by wonderboy 2 in Mathematics

what types of material dissolve in water? how does this happen?

2007-10-14 08:38:45 · 1 answers · asked by lisandra 1 in Earth Sciences & Geology

how can ice met at 0 degree celcius and water freeze at the same temperature of 0 degree celcius? at 0 degree celcius, what do you have, water or ice?

i cant figure out the answer!!

2007-10-14 08:35:11 · 2 answers · asked by karishmaaaaaaaaaaaaaaaa<33 2 in Chemistry

A 13 foot ladder is leaning against a house when its base starts to slide away. By the time the base is 12 feet from the house, the base is moving at the rate of 5 ft/sec.
At what rate is the angle between the ladder and the ground changing at that moment?

explanation please..

2007-10-14 08:32:30 · 2 answers · asked by dunkn_donut 1 in Mathematics

2007-10-14 08:30:37 · 2 answers · asked by lisandra 1 in Chemistry

A corner lot has dimensions 25 by 80 yards. The city plans to take a strip of uniform width along the two sides bordering the streets to widen these roads. How wide should the strip be if the remainder of the lot is to have an area of 921 square yards? Please label the unknown quantity as x.

2007-10-14 08:30:23 · 1 answers · asked by yo yo ma 2 in Mathematics

I have to do a question where I have to differentiate using the quotient rule, but I can't even differentiate part of it.
The bit I'm stuck on is differentiating y=ln(x^2+4)

Any help would be much appreciated, thanks!

2007-10-14 08:28:00 · 4 answers · asked by Anonymous in Mathematics

10+12+14+.....+x=306 x=?

2007-10-14 08:14:12 · 4 answers · asked by summer-night-dream 4 in Mathematics

Got this a a school project for first years....

What factors should be included/excluded? (other than normal aerodynamics and airplane construction)

2007-10-14 08:10:39 · 3 answers · asked by Ethan 1 in Engineering

2007-10-14 08:09:29 · 3 answers · asked by Rafael G 2 in Physics

Im doing sumthing 4 skool and i wanna kno how are dominant and recessive traits inherited. does anyone kno?

2007-10-14 08:06:03 · 4 answers · asked by Lexa 1 in Botany

I ve found to answers but i dont know which is right im working on my biology homework The total mass of living matter within a given unit of environmental area.
Plant material, vegetation, or agricultural waste used as a fuel or energy source.
Can you please tell me which is right if any thankyou

2007-10-14 08:05:28 · 4 answers · asked by ? 3 in Biology

Okay, these are a few things that I have wondered about for a long time, but I just got the idea to ask them now. :)

1) What the hell is a gene? Is it just a designated portion of nucleotides? I know that it is a part of a chromosome, but is this how it works: DNA is a double-stranded collection of nucleotides. This DNA "bunches" into bundles that are called genes. These genes collectively form 1 of 23 chromosomes. ?????

2) What the hell is up with evolution? Yeah, I get it that things evolve, but for example, I remember reading about a fish that had 2 eyes but because it always laid on its side, the fish eventually evolved so that both eyes were on the same side of the head. How on earth does that happen? Just because something is more convenient for your lifestyle, how can that affect your genetic makeup?

3) Lastly, I've always been taught that DNA --> RNA --> Protein... So how does your DNA determine what you look like? I don't see facial features in there anywhere!

2007-10-14 08:05:14 · 6 answers · asked by Anonymous in Biology

I will report those with silly or short answers.

2007-10-14 08:04:25 · 9 answers · asked by yodude 1 in Astronomy & Space

my teacher gave us this work sheet for homework over the weekend yet never taught us what is on it. My parents helped me with most of it but i wanted to try this second part on my own. i am doing ok but here are the 2 problems i cant solve..

What are the net forces of a car stopped at a light??

A horse exerts a force of 15N on the ground, What is the magnitude of the reaction force?What does the reaction force act on?

Please help me and tell me how you go the answer. I am baffled. haha.

2007-10-14 08:03:59 · 6 answers · asked by liveitup 2 in Physics

2007-10-14 08:01:34 · 1 answers · asked by Anonymous in Chemistry

Should I choose just one genetically modified food or talk about how they are safe or not?

2007-10-14 08:01:10 · 10 answers · asked by A<3A 1 in Agriculture

I have not been able to find one, how should I go about it ? The place we captured the photo was in the East Coast and I want a paranormal investigator to look at it and give me there opinion. I know its a ghost and he's also very famous, but I need to get a profeesional opinion . If you can please suggest someone please let me know. Please help, Thanks

2007-10-14 08:00:14 · 20 answers · asked by Thallasa35 2 in Paranormal Phenomena

me and my friends went there the other night and it was rather creepy....i know the usual stuff about the raccoon and not to go in the left woods(which we did)....i want to know about the witches, this black car that chases people out(guy w/ a messed up face), and the black cat...or anything else like stories

it would be appreciated :-)

2007-10-14 08:00:03 · 4 answers · asked by James M 1 in Paranormal Phenomena

1) All vertebrates have internal skeletons.
2) All vertebrates have skeletons made of bone.
3) Birds have oxygenated air in their lungs at all times.
4) Hair in mammals has no use other than warmth.
5) In mammals, glands secrete both sweat and milk.
6) There are more species of perching birds than there are species of all placental mammals.
7) A monotreme is a mammal that reproduces by laying eggs.
8) Some behavior patterns can be inherited.
9) A creature will exhibit aggressive behavior only against animals of a different species.

I think 9 is false males do it against other males right?

2007-10-14 07:55:47 · 2 answers · asked by Anonymous in Biology

Why do white things reflect light back, while black absorbs it? Don't just repeat my question if you know what I mean, I'm asking WHY.

2007-10-14 07:55:36 · 2 answers · asked by Big Boss the Philosopher 6 in Physics