Science & Mathematics - 1 January 2007

Which statement best compares the atomic radius of a potassium atom and the atomic radius of a calcium atom?

1)The radius of the potassium atom is larger because of its larger nuclear charge.

2)The radius of the potassium atom is larger because of its smaller nuclear charge.

3)The radius of the potassium atom is smaller because of its smaller nuclear charge.

4)The radius of the potassium atom is smaller because of its larger nuclear charge.

2007-01-01 13:37:49 · 5 answers · asked by Anonymous in Chemistry

I have pain in my left knee pretty much all the time for the past month or so, but mostly when straightening it from a bent position. I'm a 42 yr old man.
This symptom is new. The Dr I saw last month said the pain over the patella was tendonitis; this is in a different area of the knee.
The first was more over the patella.

I injured it in the summer, mostly from getting in and out of a boat for work, and riding thru rough waves. It got worse so I saw the Dr recently, and he scheduled therapy starting next week.

I decdied to see him this Wed. to see what the new pain could be. This new pain is in a different area, more on the inner side of the knee, up high. It's not swollen.
Advil doesn't seem to change the pain, nor ice.

Any ideas? I'm wondering if they are related.
I'd like to have an idea of what the possibilities are before I see the Dr.

If anyone has a similar experience I'd like to know. Also how it was treated and their outcome.

Thanks!

2007-01-01 13:35:10 · 2 answers · asked by Marie123 3 in Medicine

My dad and me like to star gaze. We both see these small faint lights or sometimes large and bright and it moves across the sky. They have no sound or silhouette of this object just the light moving across the sky. We live in the south west part of Virginia so if there anyone else who see these or have a clue what they are please reply.

2007-01-01 13:34:19 · 29 answers · asked by dragonflower91 2 in Astronomy & Space

2007-01-01 13:28:05 · 4 answers · asked by hobomagic001 2 in Mathematics

I heard that the television is like an x-ray or emits radiation of some sort.

2007-01-01 13:28:00 · 17 answers · asked by janet 1 in Physics

any tips? is there anything i should know about the view finder?and what if u just want to see the sky cept with a bunch of stars instead of magnifying with a telescope ceot u want to see it on a telescope ? how come when u put an eyepiece on there all u see is black and no stars? any overall tips?

2007-01-01 13:26:03 · 6 answers · asked by Bhaumik P 1 in Astronomy & Space

With so much literature flying around outside. i came across the mention that on increasing mag the details diminshes and the picture gets less sharper. While I agree with the sharpness I am not sure as to why the details degrad. It does not make practical sense, perhaps Im wrong but I was able to see saturn better with a 10mm eye piece than a 25mm eye piece for a 130mm 650 focal newtonian.

Have heard so many different opinions on this that perhaps I would have to end up buying a pair of barlows to see what is pratically sensible. It would help however is someone having genuinue knoweldge in the field of optics and clearly define and explain the anomoly before I go out spending money on lenses.

Again perhaps using a eyes of shorter focal length to increase mag might be better than barlow due to light bending etc I suppose.

regards

2007-01-01 13:24:59 · 3 answers · asked by planck12 1 in Astronomy & Space

The somewhat common reaction where the two clear liquids turn into a precipitated foggy liquid, and then allowing the copper to sink in and develope a silver cover. What is the chemical formula for this reaction?

2007-01-01 13:24:23 · 3 answers · asked by rakham22 1 in Chemistry

i live in Naples fl. tonight (1-1-07) i saw a ring around the moon. its kinda coo

2007-01-01 13:24:22 · 5 answers · asked by poke 2 in Earth Sciences & Geology

What is the chemical property of propylene?

What is the physical property of propylene?

and what type of organic chemical compound is it?

Please let me know if you know.

Thanks.

2007-01-01 13:22:36 · 4 answers · asked by Anonymous in Chemistry

2007-01-01 13:21:49 · 21 answers · asked by poopassboob 2 in Medicine

I have about 4 weeks.....

2007-01-01 13:21:33 · 3 answers · asked by unknown 1 in Medicine

2007-01-01 13:21:00 · 8 answers · asked by mr m 1 in Mathematics

2007-01-01 13:19:20 · 10 answers · asked by Countess Blavinskeya 2 in Biology

A=1/2ap

^solve for a


thanks

2007-01-01 13:17:27 · 7 answers · asked by Anonymous in Mathematics

which compound is colorless in a water solution?

1. Cr2(SO4)3
2. Al2(SO4)3
3. Co2(SO4)3
4.Fe2(SO4)3

2007-01-01 13:17:17 · 3 answers · asked by Jesse C 2 in Chemistry

A pulley system lifts a 1,345 N weight a distance of .975 m. Bart the physics guy's helper Larry pulls the rope a distance of 3.9 m exerting a force of 375 N.

What is the Ideal mechanical advantage?!

2007-01-01 13:16:08 · 3 answers · asked by pmwschoolstore 1 in Physics

2007-01-01 13:14:24 · 11 answers · asked by i luv rockn roll 1 in Earth Sciences & Geology

how long does it take a tasmanian devil to reproduce and how many could it have?

2007-01-01 13:14:11 · 1 answers · asked by sebas 2 in Zoology

Does anyone have any websites or information on getting around a hair drug test?

2007-01-01 13:13:57 · 8 answers · asked by jenn 2 in Medicine

2007-01-01 13:09:23 · 6 answers · asked by juan g 1 in Botany

2007-01-01 13:08:22 · 5 answers · asked by S 3 in Mathematics

I do not understand this stuff at all...!!!

a retental car agency charges $15 per day plus $.15 per mile to rent a certain car.Another agency charges $19 per day plus $.08 per mile to rent the same car.How many many miles per day will have to be driven for the cost of a car from the first agency to equal the cost of a car from the second agency?

can someone help...?please n thank you

2007-01-01 13:08:10 · 12 answers · asked by Hot_Chick 2 in Mathematics

thanx guys for the circle problem...it was really helpful...
so here it is------ write in both standard and general form the ellipse with a center at (3,2) and a major axis length of 8 units (parallel to x-axis) with a minor axis length of 6 units......

thx guys this is very important........

2007-01-01 13:06:43 · 2 answers · asked by sim 1 in Mathematics

Would the size of an organism's stomach for example be the same for both males and females? brains? liver? lungs? etc? And if they were to have the same nutrition, health, and age. Just wondering.

2007-01-01 13:06:33 · 7 answers · asked by xxeverlasting 2 in Biology

Water ruins a computer right? Why not pour water on a bomb?

2007-01-01 13:06:26 · 9 answers · asked by Anonymous in Chemistry

you know its use by German police in very bad situation , they torture me , and i want to take it out as soon as possible , please help me by your info or other ways . thank you

2007-01-01 13:05:00 · 2 answers · asked by Anonymous in Engineering

My son is doing a science project regarding the tectonic plates moving Australia some 2 inches per year and we want to calculate how long it will take to reach India, give or take 10,000 years.

2007-01-01 13:01:14 · 5 answers · asked by charles h 2 in Earth Sciences & Geology

2007-01-01 12:59:34 · 13 answers · asked by llleggs 1 in Other - Science

2007-01-01 12:56:54 · 5 answers · asked by jeremy l 2 in Botany