Science & Mathematics - 21 January 2007

Doing this review for calc, I'm a little rusty on the trig :(

Simplify using an appropiate right triangle


Sec[tan x]

2007-01-21 17:29:44 · 3 answers · asked by Dr. Daniel 2 in Mathematics

2007-01-21 17:27:40 · 6 answers · asked by Anonymous in Mathematics

2007-01-21 17:23:27 · 6 answers · asked by Anonymous in Engineering

K4Fe(CN)6 + KMnO4 + H2So4 --> KHSO4 + Fe2(SO4)3 + MnSo4 + HNO3 + CO2 + H2O.

the numbers are actually small subscripts. Kay! thanks!

2007-01-21 17:22:00 · 5 answers · asked by Anonymous in Chemistry

It takes 30 seconds for the 480 W toaster to toast a piece of bread. How many electrons were used?

2007-01-21 17:21:21 · 2 answers · asked by Anonymous in Physics

A few colleagues and I disagree about the answer to the following problem:
A shower door hinge should sit at 135 degrees. The door piece is attached to another piece of glass that is fastened to the wall at a 90 degree angle. The opening side of the door also rests against another piece of glass that is fastened at a 90 degree angle to the wall.
We inspected some samples that measured up to 139 degrees (4 degrees too wide). If the door is 1 meter in length, how far away from the second glass sheet would the opening end of the door be sitting (while the door is closed).
How did you solve it?

Thanks!!

2007-01-21 17:19:38 · 2 answers · asked by Daniel and Fang Fang in China 2 in Engineering

Magnesium can be used as a "getter" in evacuated enclosures, to react with the last traces of oxygen. (The magnesium is usually heated by passing an electric current through a wire or ribbon of the metal.) If an enclosure of 0.376 L has a partial pressure of O2 of 3.50 10-6 torr at 26°C, what mass of magnesium will react according to the following equation?

2 Mg(s) + O2(g) 2 MgO(s)

2007-01-21 17:17:11 · 1 answers · asked by nickname 3 in Chemistry

2007-01-21 17:16:40 · 3 answers · asked by roxii 2 in Astronomy & Space

in 2002, walmarts revenues were 600% more than kmarts...if walmarts revenues were 48 billion, does that mean k-marts revenues were -288 billion? please help!

2007-01-21 17:15:39 · 20 answers · asked by Valkrygrrl 2 in Mathematics

growth, devepment, respiration, or adaption

2007-01-21 17:14:17 · 5 answers · asked by nahomy 1 in Biology

2007-01-21 17:10:07 · 4 answers · asked by rr 3 in Physics

2007-01-21 17:09:06 · 5 answers · asked by Anonymous in Mathematics

dont bother leaving messages like your stupid,, all i want is info. all i felt after taking them is a little sick.. theres only 2 left if i take these 2 will it do anything, i mean 10 didnt so i doubt two will

2007-01-21 17:06:36 · 31 answers · asked by Anonymous in Medicine

Please explain how to set up the problem:

What fraction of this group is women?

3029 total politicians, 1455 are women.

Thanks!

2007-01-21 17:05:40 · 13 answers · asked by Anonymous in Mathematics

the stupid calc on the comp doesn't have square roots so ya..

2007-01-21 17:05:23 · 9 answers · asked by Noone 2 in Mathematics

I know of the wave/particle duality. My question is since light has "no mass" they have recently been able to stop or slow down light momentarily in special gas chambers. How is the light able to go back to its original speed with no help since a photon is technically still composed of matter... wouldn't you need infinite amount of energy?

2007-01-21 17:05:11 · 4 answers · asked by pezeveng3319 2 in Physics

2007-01-21 17:03:10 · 5 answers · asked by ravi 1 in Engineering

2007-01-21 17:02:03 · 4 answers · asked by Briana C 2 in Biology

1. f(x)= .5x-10
between
-2 less than or equal to x
and 6 is greater than or equal to x
Find the domain of f inversve

2. f(x)=2x^3+4x+2
let g be the inverse function
g(x)= finverse (x)
find first deriv of g(-4)

2007-01-21 17:01:42 · 5 answers · asked by Anonymous in Mathematics

2007-01-21 17:01:31 · 8 answers · asked by Anonymous in Engineering

i just find it so boring. my favorite class is science though. i just CANNOT pay attention in math, i try , but i just cant do it. what can i do to help me pay attention? i dont have this problem in any other classes, just math. how can i try to make it more interesting?!

2007-01-21 17:00:45 · 3 answers · asked by Anonymous in Mathematics

drawing

2007-01-21 16:59:23 · 1 answers · asked by cristina m 1 in Physics

a, propagating in the negative x direction

b, out of phase by 90 degrees

2007-01-21 16:58:20 · 1 answers · asked by dopplerjeff5000 2 in Physics

2007-01-21 16:57:29 · 4 answers · asked by fred moses 1 in Biology

A store takes 1/3 off the price of a $900 suit. It then takes another 1/3 off the new price. What is the final price of the suit?

2007-01-21 16:57:01 · 13 answers · asked by Anonymous in Mathematics

Solve. –7x + 1 + 8x = x + 1
A) No solution B) 0 C) 1 D) Identity

2007-01-21 16:55:13 · 7 answers · asked by sittinncat 1 in Mathematics

Solve for X in [0,2pi]

2cos^2(x) + 3cos(x) - 2 = 0

I forgot how to do this :(

2007-01-21 16:53:56 · 3 answers · asked by Dr. Daniel 2 in Mathematics

The length of one of the equal legs of an isosceles triangle is 8 cm less than 4 times the length of the base. If the perimeter is 29 cm, find the length of one of the equal legs. Define variables, set up equation and solve.

2007-01-21 16:51:23 · 2 answers · asked by sittinncat 1 in Mathematics

2007-01-21 16:50:11 · 9 answers · asked by The Knowledge Server 1 in Biology

Find two consecutive integers such that the sum of 2 times the first integer and 4 times second integer is 46. Define variables, set up equation and solve.

2007-01-21 16:49:59 · 4 answers · asked by sittinncat 1 in Mathematics