Science & Mathematics - 14 October 2007

These stars are in the disk and halo of the Milky Way Galaxy: "hot, blue main-sequence star in disk", "red main-sequence star in globular cluster M13", "the sun", "red giant in globular cluster M13"

What is the age of each star from oldest to youngest?

2007-10-14 10:26:33 · 1 answers · asked by relstudent2 1 in Astronomy & Space

good morining i have a 500x114 telescope details are
Telescope Type: Reflector
Objective Lens Diameter: 114mm
Focal Length: 1000mm
Focal Ratio: 9
Mount: Equatorial 1
Barlow: 2X
Interchangeable Eyepieces: (1.25") MA20 (50X), MA10 (100X)

does anyone know what should i be able to see with this ? i have no idea how to use it, it came with a 10,000 item sighting CD but its so confusing to use, anyone here pro enough to tell me what should i be able to view with this scope, or any websites that can tell me what i can view...

thanks for your help

2007-10-14 10:26:07 · 3 answers · asked by alec p 1 in Astronomy & Space

1. Which type of chemical bond must be present in an electrolyte? How do you know?

2.Distinguish between different types of ions. Give three examples of each type of ion.

3. Why are ionic solids non-conductors of electricity, but good conductors when metal?

4. What should I do when a question askes me to draw a dot diagram, say for phosphine, PH3?

The reason I can't answer these questions is because I don't recall learning about them last year.

2007-10-14 10:25:15 · 1 answers · asked by Memories of Another World. 6 in Chemistry

These are the ones I can't figure out.

1.Unicellular frechwater organisms are constantly surrounded by water. How do they compensate for osmosis and stay alive?
2. Plant roots or other structures may be surroinded by water. How do they compensate for osmosis and stay alive?
3. Give an exaple of a cell type that cannot compensate for osmosis. Explain what happens to them.
4. Sea water has a higher concentration of solutes than do human cells. Why might drinking large amounts of sea water be dangerous for humans?

Help?

2007-10-14 10:22:39 · 2 answers · asked by monkeymanx8 1 in Biology

2007-10-14 10:19:53 · 2 answers · asked by Anonymous in Mathematics

2007-10-14 10:19:35 · 1 answers · asked by mohjd s 1 in Chemistry

So what ways are there that could mean we can live forever?

With technology at the level it is and since its increasing all the time the question about whether or not we can live forever is asked alot and will be asked even more as we advance(i believe).

So what are scientists working on now that could allow immortality or even tens or hundreds of thousands of years of life?

Its all i want to know, i dont care about the ethics of it or how life will be boring or how all friends and family will die etc none of it phases me and i just would like an answer.

2007-10-14 10:17:57 · 1 answers · asked by Lex 1 in Other - Science

ok, its my fault i have a D in spanish...and theres only 2 weeks untill the quarter is over. i cant cheerlead if i get a failing grade lie it on my report card. i know i got myself into this, but is it possilbe i could dig myself out
& bring it up to a C in 2 weeks??

2007-10-14 10:17:08 · 10 answers · asked by life goes on ♥ 1 in Other - Alternative

i have a question on my math homework. how do you use relatively prime? or what is it and give me examples

2007-10-14 10:15:22 · 2 answers · asked by Kat 2 in Mathematics

A Ballons rises at the rate of 8 ft/sec from a point on the ground 60 ft from the observer. Find the rate of change of the angle of elevation when the balloon is 25 ft above the ground.

Let a= 60 ft
Let b= 25 ft
Let db/dt= 8
Find d(theta)/dt

Formula relating angle of elevation to height of balloon and distance from observer.

tan(theta)=b/60

Differentiate implicitly, and solve for d(theta)/dt:

d(theta)/dt = (cos^2(theta)/60) * (db/dt)

Need to find what theta is when balloon is 25 ft above ground:
USE:

arctan(5/12)= theta

Now plug theta and db/dt into the equation and I got:

d(theta)/dt= 1152/169 radians/second

Something doesn't seem right, I either missed up on a step, am paranoid, or both.

2007-10-14 10:15:02 · 2 answers · asked by Dr. AjC ♍ 3 in Mathematics

For my work when i found the derivative for the first time i got 2xcosx - xsquared(sinx)+4 cos x... is this correct so far
^ above where the arrow is pointing and at xsquared(sin x) do i use the product rule to find the second derivative? because i did n i got this answer 2cosx-2(2xsinx)-xsquared(cosx)-4sinx but i donno if this is right? can someone please help me?

thank you i really appreciate it!!

2007-10-14 10:12:16 · 3 answers · asked by Anonymous in Mathematics

2007-10-14 10:10:07 · 5 answers · asked by Al 2 in Mathematics

what is the chemical in household cleaners that reacts so violently with aluminum foil? why does it react that way? (specific chemical names plz) Thanks!!!

2007-10-14 10:08:00 · 3 answers · asked by Anonymous in Other - Science

I need to write out the net ionci equations for Na3PO4, KI, and AlCl3 when mixed with the Universal Indicator. I know how to do net ionic equations, but the problem is, i dont know what the chem. formula for UI is. Oh and I know that Na3PO4 is a base, KI is neutral, and AlCl3 is an acid. Thanks for the help!

2007-10-14 10:07:23 · 1 answers · asked by jellybean0424 2 in Chemistry

use the properties of addition and multiplication to complete the statement

2007-10-14 10:02:42 · 5 answers · asked by Sara R 1 in Mathematics

A stone is dropped into a lake, creating a ripple that travels outward at a speed of 60cm/s. find the rate at which the area within the circle is increasing after a. 1s b. 3s, and c. 5s.

2007-10-14 09:56:20 · 1 answers · asked by smarin1987 2 in Mathematics

I don't understand this: The energy produced when naturally occuring stream and hot water are tapped is called ---------------energy.

2007-10-14 09:55:09 · 7 answers · asked by do you smell..... what's coo 4 in Earth Sciences & Geology

i heard that on saturay and i was just wondering if it was true.

2007-10-14 09:54:44 · 6 answers · asked by ? 4 in Zoology

Actually a hypothesis about how this works and an experiment that could be formed to test the hypothesis.

2007-10-14 09:53:32 · 1 answers · asked by Holly H 2 in Botany

Balance the equation
? CS2 + ? O2 ! ? CO2 + ? SO2
What are the coefficients?

2007-10-14 09:53:10 · 3 answers · asked by eileen r 1 in Chemistry

Please give me some websites too, that answer these questions.

2007-10-14 09:44:51 · 2 answers · asked by gemma 3 in Mathematics

When Hydrogen gas is passed over heated Lead (IV) Oxide , Silvery beads of Lead are produced. The only other product of the reaction is water in the form of steam.

When the experiment was repeated using Magnesium Oxide instead of Lead (IV) Oxide, no metal was obtained. Explain this result ?


Thanks :D:D:D

2007-10-14 09:43:03 · 1 answers · asked by Anonymous in Chemistry

For any integer k>1, k! is the product of every integer from 1 to k. Thus, 3! = 1x2x3. Write the only integer n>32 that satisfies:
(n-23)!(23)! = (n-32)!(32)!

2007-10-14 09:42:41 · 2 answers · asked by Anonymous in Mathematics

for example, how would you do this problem?

Consider the function ln( 1 + 6 x).
Write a partial sum for the power series which represents this function consisting of the first 5 nonzero terms. Also indicate the radius of convergence.

2007-10-14 09:38:22 · 1 answers · asked by Anonymous in Mathematics

give me prof that scientific laws can change!

2007-10-14 09:38:03 · 1 answers · asked by Anonymous in Botany

2007-10-14 09:37:54 · 6 answers · asked by Anonymous in Agriculture

those are square root signs over the a, b, and c.

2007-10-14 09:36:28 · 3 answers · asked by Anonymous in Mathematics

All three are used today, but i would like to know the pro's and con's as well.

2007-10-14 09:35:49 · 5 answers · asked by TicToc.... 7 in Medicine

2007-10-14 09:31:15 · 2 answers · asked by Martha C 2 in Botany

50squared+951951951=?

2007-10-14 09:30:30 · 3 answers · asked by Anonymous in Mathematics