Science & Mathematics - 5 July 2007

2007-07-05 18:05:11 · 2 answers · asked by F J 1 in Earth Sciences & Geology

I can't figure out what the otherside of the chemical equation would be

2007-07-05 17:59:04 · 3 answers · asked by mrsjoshgroban 1 in Chemistry

Ugh...I am stuck on this other question too...

The game of euchre uses only the 9s, 10s, jacks, queens, kings and aces from a standard deck of cards. How many five-card hands have...

a) all red cards?
b) at least two red cards?
c) at most two red cards

I dont know how to go about with these questions, and keep on getting the wrong answers...

Please help me

Thanks

2007-07-05 17:54:12 · 5 answers · asked by mapleleaffan 1 in Mathematics

2007-07-05 17:50:22 · 4 answers · asked by welma 2 in Astronomy & Space

Calculate the normality of a diluted solution of HCl if its 20ml of normality 10N is mixed with distilled water to make 1dm^3 soln.


Please involve all the steps and 'explain' me what exactly the problem is and how to go about ..


Thank you tonn in advance !!

2007-07-05 17:49:04 · 5 answers · asked by > FREAK < 1 in Chemistry

Since those trees that are said to be 5000-6000 years old were found in Utah, does that mean that the "Methuselah" tree located in California (which is about 4800 years old and still alive) is just another old tree? is its title taken? here is the Wikipedia link for the "Methuselah"

http://en.wikipedia.org/wiki/Methuselah_%28tree%29


P.S. If you have google earth on your computer,
The Methuselah is posted and it includes a very good picture

2007-07-05 17:43:15 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-07-05 17:41:50 · 10 answers · asked by GrnEyedGurl 2 in Astronomy & Space

IE: He is under 8A which has 8 valence electrons. Then the atomic number is 2 which equall 2 electrons as well. Someone please help! Thank You All!

2007-07-05 17:38:39 · 12 answers · asked by Anonymous in Chemistry

I am stuck on this question, and i really really need help! please please!

A project team of 6 students is to be selected from a class of 30.... Pierre, Gregory, and Miguel are students in this class. How many of the teams would include these 3 students...

I know the answer is 2925, but i have no idea how to get that answer!

Thanks thanks thanks!

2007-07-05 17:31:27 · 5 answers · asked by mapleleaffan 1 in Mathematics

Solve the equation sinx = sin(x+2) for x is between or equal to 0 and 2 pie. (hint: Use the unit circle definition of sine for circular funtions)

2007-07-05 17:28:11 · 5 answers · asked by daniel 1 in Mathematics

Hydrogen becomes a liquid at just below absolute zero. Oxygen is a liquid at almost -300 F. So how is it that water (H2O) is a liquid at room temperature?

2007-07-05 17:26:56 · 5 answers · asked by Richard_CA 4 in Chemistry

2007-07-05 17:26:39 · 24 answers · asked by Anonymous in Biology

I know what a prime number is ( A number only divisible by itself or 1) I want to know if there is an easy formula to work out Prime Numbers when they get into the hundreds and thousands etc . Otherwise I could sit here for years ? lol.

2007-07-05 17:24:55 · 12 answers · asked by Anonymous in Mathematics

2007-07-05 17:20:45 · 12 answers · asked by Ariel 128 5 in Geography

9x+5y=45

What is y when x =1.

This is for graphing by the way..... I thought it'd be 9 but that answer was wrong.

2007-07-05 17:13:04 · 9 answers · asked by Anonymous in Mathematics

A 2.5 mole NOCL in 1.5 L in a 400 degrees Celcius solution. After it reaches equilibrium, 28% of NOCl was dissacciated.

2NOCL(g)---->2NO(g)+Cl2(g) (Reversible Reaction)

Calculate Kc.

I am stumped. Anyone have an idea?

2007-07-05 17:11:58 · 2 answers · asked by wally a 1 in Chemistry

I was watching this Time Travel movie and these guys went back in time to the Dinosaur Age and accedently stepped on a bug.
When they went back into the future, There were Dinosaur Apes.
Like, Monkeys mixed with Dinosaurs.

It makes no since to me, does it to you guys? And if so, explain to me how that happened.

2007-07-05 17:11:06 · 9 answers · asked by Anonymous in Biology

A triangle has one 90 degrees angle and from there one leg is 10.25 long and the other leg is 7.75 long. what are the degrees for the other two angles. Thank you

2007-07-05 17:09:57 · 8 answers · asked by clemaube 1 in Mathematics

Please help solve and explain the problems for me.

tan(2 arctan x)

cos(2 arcsin x)

2007-07-05 17:09:40 · 3 answers · asked by Binky 3 in Mathematics

Hi, I am on summer break and I am really worried. I dont want to foreget my math skills but it seems I am. Is there anything that would be REALLY helpful to help keep myslef sharp. I still have all of my notes from school. I really want to make sure I dont forget. I know that I will never foreget but I want to make sure and refresh my mind. Please help! Thanks in advance for all of the advice.

Add: I am my moms human calculator when we go grocery shopping and I tutor kids. I just finished Algebra 1 and I am going into geometry. Just some additional info. Thanks again!

2007-07-05 17:07:55 · 5 answers · asked by Dogna M 4 in Mathematics

A child exerts a force of 2.0N [forward] on a stationary 4.0kg tricycle for 1.2 seconds. Calculate the acceleration of the tricycle.

So... All i could think of is given : force of 2.0N, Time of 1.2s and a mass of 4.0kg.
Required: Acceleration
Analysis: Im not sure which formula to use? I cant use a = velocty/time because I do not know velocity... and i cant use V=a x time because i dont know veloctiy. Im confused? Please help? Thanks!

2007-07-05 17:06:12 · 2 answers · asked by Daniel C 2 in Physics

2007-07-05 17:04:40 · 5 answers · asked by pinky 23 1 in Medicine

2007-07-05 17:02:28 · 4 answers · asked by Anonymous in Engineering

2007-07-05 16:55:56 · 8 answers · asked by dco123 2 in Zoology

If we make a hole in ground and jump in it means you will reach its bottom surface because of gravity... WHAT WILL HAPPEN IF YOU JUMP IN THE HOLE MADE IN EARTH WHICH REACHES NEXT END... LIKE DRILLED FORM INDIA WILL REACHES US... COULD YOU REACH US??????

2007-07-05 16:53:26 · 16 answers · asked by Anonymous in Physics

Q.1 A ball is thrown vertically upward from the ground with a speed of 25 m/s. On its way down it is caught at a point 5m above the ground. How long did the trip take?

Q.5 The time period of a pendulum is 2 seconds at the surface of the earth calculate its time period on the surface of the moon where the value of acceleration due to gravity is one-sixth that of the value of ‘g’ at the surface of the earth.

Q.7 If a diffraction grating produces a first order spectrum of light of wavelength 6*10^-7 m at an angle of 20 from the normal: calculate the number of lines per mm.

2007-07-05 16:53:20 · 1 answers · asked by Anonymous in Physics

Is it zero, one or infinity?

2007-07-05 16:51:21 · 24 answers · asked by marc 2 in Mathematics

How is it that, within minutes of heavy downpour, rivers can flood streets with 3-4 feet of water? It just doesn't seem like _that_ much comes down in so short a time, not to mention the water is spread out over a couple miles at least.

2007-07-05 16:47:54 · 3 answers · asked by Katie 2 in Weather

solve each inequality:

a) 1 < ln x < 6

b) e^(2-3x) > 5

2007-07-05 16:46:53 · 4 answers · asked by Anonymous in Mathematics

Well I want to know because alot of his work inspires me.

2007-07-05 16:46:38 · 2 answers · asked by Anonymous in Mathematics