Science & Mathematics - 1 February 2007

2007-02-01 16:40:46 · 8 answers · asked by arvilue r 1 in Mathematics

I get stuck on this problem when it is time to add:

9y^4/x^-2 + (x^-1/y^2)^-2

Steps:
9x^2y^4 + x^2/y^-4
9x^2y^4 + x^2y^4

=10x^2y^4?

2007-02-01 16:40:16 · 9 answers · asked by Thegrip 2 in Mathematics

In one tumor 5% of the cells are in Mitosis cell cycle and in another tumor 1% of cells are in Mitosis cell cycle.

2007-02-01 16:39:37 · 5 answers · asked by Jared H 1 in Biology

If you have a cylinder and all it gave you was the height and the area of the top circle so an example

A=81Pie
H=7


Also how do i find the Surface area and volume of a triangular prism? i think its just 1/2 l*w*h? am i wrong?
How would i find the radius of this circle to find out the area or the surface area?


Also...

If i have the circumfrence and the height as well so example



C=81pie
H=7

Would the diameter just be 81 then sice c=d*pie?

Please help? lol and thanks

2007-02-01 16:39:23 · 1 answers · asked by Hmm 1 in Mathematics

2007-02-01 16:38:16 · 4 answers · asked by Anonymous in Astronomy & Space

what is the antiderivitive of cos(t^2)? Pleaz show me how you got the answer.

2007-02-01 16:38:03 · 1 answers · asked by Michael M 4 in Mathematics

2007-02-01 16:37:51 · 10 answers · asked by Anonymous in Engineering

2007-02-01 16:36:43 · 5 answers · asked by Anonymous in Engineering

i live near philadelphia, and we were supposed to be getting a big snow storm. its 1230 and it hasnt snowed yet.. i was hoping to not have school :[ whats up with this?

2007-02-01 16:33:09 · 5 answers · asked by Anonymous in Weather

In the movie GATTACA, vincent's parents select a fertilized embryo that is genetically engineered to make him male,more intelligent,stronger,and to have certain physical features. It is now possiable to determine the gendger of an embryo before it is transferred to your womb. should you be allowed to direct your doctor to select embryos on the basis of there sex? If it became possible for yourphysician to selet more a specfic traits for your fetus (like strength or intelligence) would you do so?

2007-02-01 16:31:40 · 2 answers · asked by Anonymous in Biology

the equation for the synthesis of ammonia is N2 + 3 H2 ---> 2NH3. how many grams of H2 are needed to produce 45 mol NH3 ?

Can someone explain this and how to do it step by step...

2007-02-01 16:30:31 · 2 answers · asked by Zac 2 in Chemistry

N-ethyl maleimide (NEM) reacts with free sulfhydryls

2007-02-01 16:30:17 · 2 answers · asked by hptz1000 5 in Biology

For this problem neglect air resistance and remember that weight = mg. How much force acts on a 0.01 kg coin when it is halfway to its maximum height?

2007-02-01 16:29:44 · 3 answers · asked by Tone_Loc 2 in Physics

Question:
Ag+ + Cl- ---- AgCl (s)
AgCl (s) + 2NH3 ----- Ag(NH3)2 +
Ag(NH3) + + Br- ------ AgBr (s)
AgBr (s) + 2S2O3 2- ----- Ag(S2O3)2 3-
Ag(S2O3)2 3- + I- ----- AgI (s)

From the data above, list the following equilibrium solutions in the order of decreasing free Ag+ concentration in the mixture: 0.1 M AgNO3, saturated AgCl, saturated AgBr, saturated AgI, Ag(NH3)2 +, and Ag(S2O3)2 3-.

My Approach:
Tough one. I have a slight idea, but I don't think it observes any of the equilibrium laws arrrgghhh!! (i award best answers to those who take some stress off of me)

2007-02-01 16:29:19 · 3 answers · asked by Anonymous in Chemistry

yea

2007-02-01 16:28:22 · 14 answers · asked by psuedo623 2 in Mathematics

The 24 lines of longitude that approximates the 24 standard time zones are equally spaced around the equator.

The radius of the equator is about 3960 miles. About how wide (in miles) is each time zone at the equator?

2007-02-01 16:26:11 · 6 answers · asked by xiuhcoatl 1 in Mathematics

I'm stuck on 2 HW problems. This is for my Calc III class.

1) A projectile from the origin is to be fired at a target 600 feet away. There is a hill 300 feet high midway between the gun site and this target. At what initial angle of inclination should the projectile be fired?

*My guess to approach this is: Will this be a 2-part problem? Solving for an angle from origin to 300 ft then from 300 ft to 600? I don't know how to start exactly.

2) A point moves on a circle whose center is at the origin. Use the dot product to show that the position & velocity vectors of the moving point are always perpendicular.

*I know the answer is scalar, and must be 0 for the vectors to be perpendicular. That's as far as I can get for now. I will keep trying things till tomorrow morning (the last time I can check here before turning in these in).

Any helpful suggestions for either problem or both will be greatly appreciated. Thank you for your time and help! :)

2007-02-01 16:25:46 · 1 answers · asked by PuzzledStudent 2 in Physics

The 24 lines of longitude that approximates the 24 standard time zones are equally spaced around the equator.

Suppose you use 24 central angles to divide a circle into 24 equal axes. Express the measure of each angle in degrees, to the nearest ones place.

2007-02-01 16:24:50 · 5 answers · asked by xiuhcoatl 1 in Mathematics

If the chance for rain are 40% and 20% for the two days of a weekend, what is the chance that it will rain on at least one day if the 2 events are independent?

2007-02-01 16:24:36 · 6 answers · asked by Anonymous in Mathematics

1) A projectile from the origin is to be fired at a target 600 feet away. There is a hill 300 feet high midway between the gun site and this target. At what initial angle of inclination should the projectile be fired?

*My guess to approach this is: Will this be a 2-part problem? Solving for an angle from origin to 300 ft then from 300 ft to 600? I don't know how to start exactly.

2) A point moves on a circle whose center is at the origin. Use the dot product to show that the position & velocity vectors of the moving point are always perpendicular.

*I know the answer is scalar, and must be 0 for the vectors to be perpendicular. That's as far as I can get for now. I will keep trying things till tomorrow morning (the last time I can check here before turning in these in).

Any helpful suggestions for either problem or both will be greatly appreciated. Thank you for your time and help! :)

2007-02-01 16:24:23 · 3 answers · asked by PuzzledStudent 2 in Mathematics

How many females were alive on earth at the time of Eve's death? And if you answer this question, how did you come to the answer of your equation?

2007-02-01 16:23:42 · 6 answers · asked by AnnG 1 in Mathematics

Western North America has many copper and molybdenum ore deposits even though there are no subduction zones to produce them. How can this be explained in terms of plate tectonics?

Thanks.

2007-02-01 16:22:33 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Someone please explain also how to get this answer

2007-02-01 16:21:16 · 9 answers · asked by ohsbabygirl22 1 in Mathematics

How many females were alive on earth at the time of Eve's death? And if you answer this question, how did you come to the answer of your equation?

2007-02-01 16:19:35 · 8 answers · asked by AnnG 1 in Biology

2007-02-01 16:15:48 · 2 answers · asked by elaine veronica Y 1 in Mathematics

If a= i +6j+k and b= i+13j+k , find a unit vector with positive first coordinate orthogonal to both a and b.
____i + ____ j + _____k

2007-02-01 16:14:56 · 2 answers · asked by Anonymous in Mathematics

2007-02-01 16:12:13 · 7 answers · asked by sharlene m 1 in Astronomy & Space

I know it has something to do with taking the tangent, but then what?

2007-02-01 16:10:15 · 4 answers · asked by John 2 in Mathematics

Solve:
At 7:00 A.M. Joe starts jogging at 6 mi/h. AT 7:10 A.M. Kenb starts off after him. How fast must Ken run in order to overtake him at 7:30 A.M.?

It takes a plane 40 min longer to fly from Boston to LA at 525 mi/h than it does to return at 600 mi/h. How far apart are the cities?

At 8:00 A.m, the Smiths left a campground, driving at 48 mi/h. At 8:20 A.M. the Garcias left the same campground and followed the same route, driving at 60 mi/h. At what time did they overtake the Smiths?
Anybody who can help please do so. I don't understand this at all. Thank you to anyone who answers it for me! : )

2007-02-01 16:10:13 · 9 answers · asked by gurlygurl 3 in Mathematics

2007-02-01 16:10:02 · 1 answers · asked by Anonymous in Chemistry