Science & Mathematics - 31 October 2006

Low levels of calcium ions in the blood cause

2006-10-31 04:55:31 · 4 answers · asked by Anonymous in Chemistry

I already see it coming... no I am not the ugliest mammal! :)

2006-10-31 04:55:05 · 13 answers · asked by Fitty4ex 3 in Zoology

2006-10-31 04:53:23 · 6 answers · asked by aschreib2 1 in Geography

Am studying spectroscopy but am not getting the concepts..

2006-10-31 04:52:51 · 2 answers · asked by Sreek n 1 in Physics

2006-10-31 04:48:43 · 6 answers · asked by Sreek n 1 in Biology

I have an SPSS database with about 2000 students who took English Comp this past academic year. I also have their SAT scores. The correlation between the two is .381, which is significant at the .01 level. But how do use that to predict what a student with an SAT of X will get in English Comp? We are trying to determine if our SAT cut-score for entrance into English is too high or too low.

2006-10-31 04:47:15 · 5 answers · asked by Anonymous in Mathematics

An ray of light is incident on a block of transparent material with an angle of incidence of 42. The angle of refraction is 25 degrees. Use Snell's Law and remember that the index of refraction of air may be taken to be 1.00. (What equation do you use too?)(If it's possible, can you list the steps you took to get the answer?)THANKS!

2006-10-31 04:47:11 · 3 answers · asked by Anonymous in Physics

The niche and reason why they exists etc.

2006-10-31 04:45:21 · 7 answers · asked by noslot777 3 in Zoology

2006-10-31 04:45:03 · 5 answers · asked by Anonymous in Mathematics

I have an assignment to hand in later this week!!!

Could somebody please explain "The construction of a simple parallel plate capacitor"

And briefly explain how a variable capacitor works?

2006-10-31 04:43:14 · 2 answers · asked by Anonymous in Physics

2006-10-31 04:42:36 · 2 answers · asked by Danielle P 1 in Chemistry

Im stuck...

2006-10-31 04:41:57 · 6 answers · asked by Brayden J 2 in Mathematics

It's not room temperature issue or too many coverings.

2006-10-31 04:40:04 · 12 answers · asked by tamster 2 in Medicine

I would like to have it done but I am scared that they might miss my eye or something and that I might be left blind or something!! Please advice as I'm really not sure about the whole procedure!!

2006-10-31 04:38:34 · 18 answers · asked by Vicki Z 2 in Medicine

.30 m and mass of 1.1 kg is rotating at 93.6 rad/s. What torque is necessary to stop the tire in 1.72s ? Answer in uits of N.m

2006-10-31 04:35:40 · 1 answers · asked by Dee 4 in Physics

What are things I should look for when buying a telescope?

What are the good brands out there?

Some telescopes that you can recommend for first time user & buyer?

Price range willing to $100-$300

2006-10-31 04:35:05 · 4 answers · asked by jackie_vora 1 in Astronomy & Space

2006-10-31 04:34:01 · 17 answers · asked by A B 1 in Biology

2006-10-31 04:33:13 · 8 answers · asked by Anonymous in Mathematics

2006-10-31 04:32:39 · 9 answers · asked by BO BOO 1 in Zoology

2006-10-31 04:31:05 · 1 answers · asked by Anonymous in Chemistry

A sled weighing 60.0N is pulled horizontally across snow so that the coefficient of kinetic friction between the sled and the snow is 0.100. A penguin weighing 70.0N rides on the sled. If the coefficient of static friction between the penguin and the sled is 0.700, find the maximum horizontal force that can be exerted on the sled before the penguin begins to slide off.

I'm not sure what the answer is.

I asserted that since the penguin is on the sled the normal force of the system is 130N, so I found the force of friction using the coefficient of kinetic friction to be 13N. Then I found the force of friction of the penguin sliding off, using the coefficient of static friction and a normal force of 70N of the penguin, to be 49N. I said that since it is moving at a constant speed there has to be a force of 13N on the sled already, so if I subtract 13N from 49N I would get 36N. So 36N is the force that is needed to slide the penguin off, right? or would it be 13N+49N=62N? Thanks so much!

2006-10-31 04:30:54 · 2 answers · asked by akujinduck 1 in Physics

Can anyone do this integral

x*tanx dx
this looks easy but it isn't....
gve me the final answer and then differnetiate it to see whether u get x*tanx

2006-10-31 04:29:17 · 2 answers · asked by nice dude 1 in Mathematics

Show that the differntial equation has a polynomial solution (i.e., the infinite series terminates after finitely many terms).

2006-10-31 04:28:25 · 3 answers · asked by jessi220542 1 in Mathematics

plzzzzzzzzzzzz help!

2006-10-31 04:26:26 · 10 answers · asked by Siddharth 1 in Zoology

See the figure at http://i14.tinypic.com/40dz9eb.gif.

The masses, of mass m, are 'particles'. The rods, of mass M and length L, are 'thin'. I'm trying to help someone answer the question "What is the rotational energy and kinetic energy?" I think given I, the rest I can do OK. Many thanks to anyone who can help.

2006-10-31 04:26:24 · 1 answers · asked by sojsail 7 in Physics

Find the series solution of the differential equation.

2006-10-31 04:26:14 · 2 answers · asked by jessi220542 1 in Mathematics

I need some help, thanks!

15. a. Let f be a function such at | f(x) | =< x^2 for all x. Prove that f is differentiable at 0.
b. This result can be generalized if x^2 is replaced by | g(x) |, where g has what property?

19.a. Suppose that f(a)=g(a)=h(a), that f(x)= b. Show that the conclusion does not follow if we omit the hypothesis f(a)=g(a)=h(a).

22. Suppose that f is differentiable at x. Prove that:
f '(x) = lim (h ~> 0) [f(x+h) - f(x-h)] / 2h

28.a. Find f '(x) if f(x) = |x|^3. Find f ''(x). Does f '''(x) exist for all x?
b. Analyze f similarly if f(x) = x^4 for x >= 0 and f(x) = -x^4 for x =< 0.

More to come, anything on these would be immensely helpful. Thanks again!

~Andrew

2006-10-31 04:24:53 · 1 answers · asked by Andrew H 1 in Mathematics

2006-10-31 04:23:01 · 18 answers · asked by Anonymous in Zoology

2006-10-31 04:22:46 · 23 answers · asked by Ms Confused 1 in Other - Science

The guy who answered this yesterday was totally off.
I'm given the minimum amount of energy, 2.0x10^-17 J. I have to calculate how many photons of red light (700 nm) are needed to reach that. How do I do that?

2006-10-31 04:14:56 · 3 answers · asked by velmakelly777 1 in Physics