Science & Mathematics - 27 September 2007

find the solutions of the equation in the interval [0,2pi)

sinx/2-cosx=0

2007-09-27 13:17:47 · 2 answers · asked by devincr 1 in Mathematics

2007-09-27 13:17:41 · 7 answers · asked by Clark Kent 1 in Astronomy & Space

To analyze the alcohol content in a certain bottle of wine, a chemist needs 1.25L of 0.25m Potassium dichromate (K*2 Cr*2 O*7) How much solid potassium dichromate is needed to make this solution? use correct sig figs

ok so this is one of my hw questions and im really lost right now...i need some help...so can you help me with the steps and formula??....and figure it out...so i can write down the formula and figure it out myself and then check it??...please i really need to understand this...got a test coming up soon!

2007-09-27 13:16:51 · 1 answers · asked by Riley 1 in Chemistry

Is there a name given for the synthesized form of the amino acids alanine and cysteine? Thanks for reading~

2007-09-27 13:15:15 · 2 answers · asked by Selena S 2 in Chemistry

when is the greatest common factor of two #'s one of the two #'s?Explain your resoning.

2007-09-27 13:14:58 · 5 answers · asked by Anonymous in Mathematics

like if your given a time and angle and have to find all other possible info.. whats difference between horizonta & vertical components??

2007-09-27 13:14:13 · 2 answers · asked by Anonymous in Physics

2007-09-27 13:13:50 · 7 answers · asked by shawntae6513 1 in Mathematics

I once thought I saw a UFO, it turned out to be a blimp, boy was I disappointed.

2007-09-27 13:13:37 · 6 answers · asked by Geary 3 in Paranormal Phenomena

Please answer!

2007-09-27 13:11:59 · 4 answers · asked by Leelee N 4 in Astronomy & Space

An object of mass 2kg travels east at 5m/s and crash in an object of 10kg traveling west at 1m/s.
A)What would be the final velocity if the objects stuck together?
B)What is the momentum of the 2kg object before the collision?
C)What is the total momentum after the collision?
D)Does this contradict the law of conservation of linear momentum?

2007-09-27 13:11:07 · 1 answers · asked by Anonymous in Physics

could someone help me answer these quetsions on the elemnt lithium??? like the advanges and disadvantages, and how it effects society? (not the drug, just the metal)

thanks so much
if you need further information i'll add notes

2007-09-27 13:10:25 · 1 answers · asked by ωαs iт? 6 in Chemistry

The wave heights, h, in the open sea depend on the speed, v, of the wind and the length of time, t, that the wind has been blowing at that speed.
h=f(v,t)
What is the meaning of the partial derivatives (dh/dv) and (dh/dt)?

2007-09-27 13:10:00 · 3 answers · asked by Amelia 6 in Mathematics

2007-09-27 13:09:19 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-27 13:08:27 · 13 answers · asked by Anonymous in Earth Sciences & Geology

2007-09-27 13:07:17 · 5 answers · asked by Anonymous in Earth Sciences & Geology

jen cleans the kitchen in 20 minutes, her brother ken does it in 12 minutes, but ben, her 2 year old brother, can mess up the kitchen in 10 minutes, how many minutes does it take three of them to clean the kitchen

2007-09-27 13:04:40 · 5 answers · asked by jennifer 2 in Mathematics

i know the earth rotates. but do the stars also rotate. i jus recently looked up in the sky and noticed the big dipper was not in its usual spot. it moved like three times already.

2007-09-27 13:04:31 · 6 answers · asked by m_ilene12 1 in Astronomy & Space

NaNO2 = Potasium Nitrate right?

2007-09-27 12:58:17 · 4 answers · asked by Anonymous in Chemistry

On the wheeloaders (payloaders) we build at the plant I work at, one of the main lift arms has the words 'ductile iron, do not weld', embossed on it.
Oddly enough one of the engineers at the plant could not answer my question. What is 'ductile iron' and why can it not be welded?

2007-09-27 12:58:12 · 3 answers · asked by escort500xl 4 in Other - Science

2007-09-27 12:57:37 · 2 answers · asked by Christina 3 in Chemistry

the total amount of a certain drug diminishes in the blood exponentially. if a patient receives 20 mg at noon and it is known that only 12 mg remain at 8 pm,

A) write an equation for the amount of the drug remaining after t hours.

B) find the amount of drug remaining in the patient's blood at noon the next day

i really just need an explanation or guidance with A. i'm bad at math okay?! i've been absent so i'm doing the classwork (meant to be done with help of teacher/classmates) at home and so i'm just checking ha.

2007-09-27 12:57:35 · 2 answers · asked by helloosunshine 3 in Mathematics

Don't worry i'm not planning on committing suicide or anything [doubt you'd care but that's not the point hehe].

A list would be good.

Are they chemicals that are easy to get hold of/found in everyday surroundings or are they things used exclusively in the scientific world..?

What is it about certain chemicals that makes them react badly with the human body?
(I've never really paid attention to scientific things, but this topic interests me.)
Thanks

2007-09-27 12:57:28 · 5 answers · asked by Anonymous in Chemistry

I can't find out how to get 4 with using 7 and 5. Thanks for any help

2007-09-27 12:56:38 · 4 answers · asked by norcalgrl87 1 in Mathematics

2007-09-27 12:55:37 · 2 answers · asked by Anonymous in Chemistry

2007-09-27 12:55:12 · 4 answers · asked by Anonymous in Earth Sciences & Geology

Which of the following statements is NOT true of covalent compounds?

a.they form when atoms of two elements share electrons.

b.they have weaker bonds than ions in crystal lettuce

c.they are composed of independence particles called molecules.

d.they have a higher melting point than ionic compounds.

Why dont water and oil mix?


Most soltions that contain molecules of covalent compounds do not conduct an electric current. True or False

Lemon changes the color of tea because the lemon contains a substances called a(n) ________. (acid or base)

2007-09-27 12:53:52 · 2 answers · asked by Anonymous in Physics

2007-09-27 12:53:33 · 2 answers · asked by Anonymous in Biology

its math homework!

2007-09-27 12:52:22 · 3 answers · asked by Valerie5_0 2 in Mathematics

2007-09-27 12:52:04 · 1 answers · asked by Anonymous in Chemistry

2007-09-27 12:51:47 · 1 answers · asked by Caramel 2 in Chemistry