Science & Mathematics - 5 August 2007

Solve For Θ

0 ≤ Θ < 360

2007-08-05 07:03:40 · 3 answers · asked by Bobby 1 in Mathematics

If a = <4, 1, 3> and b = <-2, 2, 1>, then proj [sub]b a =

these are the possible answers to choose from....

a. (-1)<-2, 2, 1>
b. (-1/3)<-2, 2, 1>
c. (-2/9)<-2, 2, 1>
d. (-1/9)<-2, 2, 1>
e. <0, 0, 0>
f. (2/9)<-2, 2, 1)
g. (1/3)<-2, 2, 1>
h. <-2, 2, 1>
i. none of these

2007-08-05 07:02:16 · 1 answers · asked by Doug 2 in Mathematics

Solve For Θ

0 ≤ Θ < 360

2007-08-05 07:01:32 · 1 answers · asked by Bobby 1 in Mathematics

these are possible answers to choose from....

a. -1/(4t^3)
b. 1/(4t^3)
c. 1/(2t^3)
d. -1/(2t^3)
or None Of These?

2007-08-05 06:57:04 · 6 answers · asked by Olivia 4 in Mathematics

equations to choose from....

a. 4x^2 + 9y^2 - 8x + 18y - 23 = 0
b. 9x^2 + 4y^2 - 18x + 8y - 23 = 0
c. 4x^2 + 9y^2 + 8x - 18y - 23 = 0
d. 9x^2 + 4y^2 + 18x - 8y - 23 = 0
e. 4x^2 + 9y^2 - 8x - 18y - 23 = 0
f. 9x^2 + 4y^2 - 18x - 8y - 23 = 0
g. none of these

2007-08-05 06:55:45 · 1 answers · asked by Olivia 4 in Mathematics

It is clear that the temperatures and pressures of the different phases are equal, due to the maximum entropy requirement. Though I can't proof why both are known to remain constant during transition.

That apparently holds, if the P(T) curve intersects the curve of phase coexistence at one point only. Then the transition happens at this very point of fixed T and P.

But couldn't one imagine the P(T) curve moving towards the coexistence curve, then moving ON it for a while and then leaving it. The part where both curves show congruence would represent the transition, during which temperature and pressure would change.

2007-08-05 06:53:22 · 2 answers · asked by Nick P 3 in Physics

Suppose you wanted to do an experiment to find out if changing the weight on the end of the string changed the amount of time the pendulum takes to swing back and forth. Which pendulums would you use for the experiment?

http://i16.tinypic.com/4r24z5x.gif

2007-08-05 06:51:54 · 5 answers · asked by sunsadness 1 in Physics

6n=2/3(5n-2)

2007-08-05 06:50:26 · 8 answers · asked by Jay 2 in Mathematics

The polar equation r^2 - 2r(sin q) = 3 corresponds to which, of the rectangular equations listed.

possible answers to choose from....

a. (x + 1)^2 + (y + 1)^2 = 4
b. (x + 1)^2 + (y - 1)^2 = 4
c. (x - 1)^2 + (y + 1)^2 = 4
d. (x - 1)^2 + (y - 1)^2 = 4
e. x^2 + (y + 1)^2 = 4
f. x^2 + (y - 1)^2 = 4
g. (x + 1)^2 + y^2 = 4
h. (x - 1)^2 + y^2 = 4
i. none of these

2007-08-05 06:48:13 · 3 answers · asked by chris 2 in Mathematics

A) its density is correctly related to the density of concrete
B) it is relatively inexpensive compared to other metals
C) its coefficient of thermal expansion is the same as that of concrete
D) its Poissons ratio is the same as that of concrete

2007-08-05 06:46:46 · 6 answers · asked by Kai K 1 in Engineering

A Ferris wheel has a radius of 25 meters and completes one revolution in 4 minutes. Correct to the nearest tenth of a meter per second, what is the average speed of someone in a car at the rim of the wheel?

these were the possible answers that were given....

0.5 m/sec
0.6 m/sec
0.7 m/sec
0.8 m/sec
0.9 m/sec
1.0 m/sec
or none of these

2007-08-05 06:45:18 · 6 answers · asked by chris 2 in Mathematics

Write the equation that shows how radium 226 decays to give an alpha particle and another element?

2007-08-05 06:39:28 · 2 answers · asked by MizzKin 1 in Physics

How many times more dense is the material of a neutron star that earth's atmosphere? Does anyone know?

Bonus: How about a bagel?

2007-08-05 06:37:10 · 6 answers · asked by Anonymous in Astronomy & Space

Does anyone know where I can get a TI-84 Plus Silver Graphing Calculator for cheaper than they are in the stores ( about $117.00). I need one for math class and I don't really want to pay 117 dollars. Thanks in Advance!

2007-08-05 06:32:51 · 3 answers · asked by Anonymous in Mathematics

Solve For Θ

0 ≤ Θ < 360

2007-08-05 06:32:49 · 2 answers · asked by Bobby R 2 in Mathematics

Solve For Θ

0 ≤ Θ < 360

2007-08-05 06:29:32 · 3 answers · asked by Bobby R 2 in Mathematics

A couch is 8 1/6 feet long. The material needed to make a slipcover is to be 2 1/3 times as long to allow for hems and tucking under. How long a piece of material is needed? I know the answer is 16 1/3 but I need help seeing how one gets that answer. Thanks

2007-08-05 06:26:47 · 3 answers · asked by Chris 2 in Mathematics

What am I doing wrong in this problems...
3.6 divided by 1.5 and 0.36 divided by 0.15
I know the answer is 2.4 but I'm getting 2.6

2007-08-05 06:23:25 · 5 answers · asked by Anonymous in Mathematics

2007-08-05 06:15:18 · 4 answers · asked by Mercedes 1 in Mathematics

2007-08-05 06:13:42 · 5 answers · asked by Mercedes 1 in Mathematics

2007-08-05 05:54:47 · 9 answers · asked by Joha 2 in Biology

could u please make this in easy to understand english? i've read a bunch of sites about it but none of them make since. and made could u give me a link or something?

thanks!

2007-08-05 05:51:09 · 4 answers · asked by Anonymous in Physics

find the exact value

sin(2 pi/3)

I forgot how to do these. can someone please explain

2007-08-05 05:47:23 · 7 answers · asked by Paul C 1 in Mathematics

The length of a rectangle is 3 in. more than twice its width. If the perimeter of the rectangle is 36 in., find the width of the rectangle.

2007-08-05 05:35:54 · 7 answers · asked by trevor s 2 in Mathematics

2007-08-05 05:35:23 · 8 answers · asked by jirvine7774 1 in Mathematics

its my home work plz help in my opinion its not cause we can not obtain any slopes for the curve

2007-08-05 05:34:58 · 4 answers · asked by suerena 2 in Mathematics

It is long and white with L484 imprinted on it? Thank you...Jen

2007-08-05 05:34:13 · 3 answers · asked by jen 1 in Medicine

2007-08-05 05:28:44 · 6 answers · asked by Anony-mouse 3 in Earth Sciences & Geology

a health clinic uses a solution of bleach to sterilize petri dishes in w/c cultures are grown. the sterilization tank contains100 gal of a solution of 2% ordinary householdbleach mixed with pure distilled water. New research indicates that the concentration of bleach should be 5% for complete sterilization. how much of the solution should be drained and replaced with bleach to increase the bleach content to the recommended?

2007-08-05 05:23:46 · 3 answers · asked by Anonymous in Mathematics

for ex. a rectangular garden has a perimeter of 240 ft. the lenght is 8 ft longer than its width. what is the length of the garden

2007-08-05 05:19:39 · 5 answers · asked by ititit3 2 in Mathematics