Science & Mathematics - 16 September 2007

Solve 1 - (x-3)/3 is less than or equal to 1/2

These interval notation problems are usually easy for. I guess I don't know what to do with the (x-3)/3.

I know the final answer is x is greater than or equal to 9/2 or [9/2 , infinity )

2007-09-16 19:19:16 · 4 answers · asked by john_ 2 in Mathematics

2007-09-16 19:13:41 · 2 answers · asked by Anonymous in Mathematics

Solve x^2 + 7x - 7 = 0

Find the x-intercepts of f(x) = x^2 +7x - 7

2007-09-16 19:09:14 · 1 answers · asked by Anonymous in Mathematics

2007-09-16 19:07:13 · 4 answers · asked by yan yan 1 in Engineering

2007-09-16 19:02:56 · 8 answers · asked by Asker 6 in Physics

2007-09-16 19:02:37 · 6 answers · asked by Anonymous in Mathematics

Why do atoms give off or take in energy whenever they gain an electron?

2007-09-16 19:00:59 · 1 answers · asked by Anonymous in Chemistry

which ordered pairs (4,1), (9,0), (-1,-2), (-16,5) are the solution for equation x + 5y = 9?

2007-09-16 19:00:00 · 6 answers · asked by hplover1430 2 in Mathematics

http://www.nasa.gov/audience/forstudents/k-4/home/F_NASA_Contests.html

2007-09-16 18:58:02 · 3 answers · asked by Anonymous in Physics

|x + 1| = 4
|y - 1| = 7

2007-09-16 18:56:32 · 3 answers · asked by SICK MY DUCK! 1 in Mathematics

2007-09-16 18:53:18 · 12 answers · asked by k g 1 in Astronomy & Space

2007-09-16 18:51:17 · 3 answers · asked by yan yan 1 in Engineering

If nuclear fusion fuses hydrogen atoms together to make helium atoms and vise versa then why are stars running out of hydrogen if hydrogen is always made again by nuclear de-fusion which would probably mean helium turning back into 2 hydrogen atoms? This is a wierd phenomena. How is it running out when it is made again and again? Is nuclear fusion made more than nuclear de-fusion?

2007-09-16 18:50:01 · 4 answers · asked by Allen 2 in Physics

2007-09-16 18:48:08 · 2 answers · asked by yan yan 1 in Engineering

The actual efficiency of the engine is 42.0%. How much useful power does the engine deliver if it takes in 1.15 10^5 J of energy each second from its hot reservoir?

i did the calculation (0.42) * (1.15 10^5 J ) and got 48300 joules and cannot figure out how to get it to kilowatt not kwh just kW is what the site asks for

2007-09-16 18:46:53 · 6 answers · asked by sabresfan58 1 in Physics

and preparing for his final year project. He's looking for an electronic software to run on his PC which stimulates his circuit. The trouble is that the current one that he has is not working and he's trying to locate a new one. Does anyone know any places that might sell the electronic software besides Lowyat Plaza? TQ

2007-09-16 18:45:34 · 3 answers · asked by shamie g 1 in Engineering

2007-09-16 18:44:13 · 6 answers · asked by mirtunjay patro 1 in Engineering

i know the answer is 67/40 but i dont know how to get it please help

2007-09-16 18:44:06 · 9 answers · asked by kiana817 1 in Mathematics

During a volcanic eruption, chucks of solid rock can be blasted out of the volcano; these projectiles are called volcanic blocks. Rock is blasted at an elevation of 3300 meters at an angle of 35 degrees.

a) At what initial velocity would a block have to be to be ejected, at 35 degrees to the horizontal, from the vent to the foot of the volcano 9400 meters away?

b) What is the time of flight?

I can do B, but I dunno how to find initial velocity, most of the problems I did with projectile motion already gave me initial velocity. Here's what I did:

I used the formula y-y(0)=vt-1/2at^2. I'm going to assume the final velocity of this whole thing is 0, and gravity is -9.8m/s^2, so:

-3300=-4.9t^2; t=26

I used that "t" to plug into: v=v(0)+AT

0=v(0)-9.8(26); V(0)=255 m/s. The answer that the book got was 260 m/s, can anyone show me what I did wrong and how to do the problem? Thanks!

2007-09-16 18:42:19 · 3 answers · asked by Anonymous in Physics

Explain the difference between congruent and similar figures ?

2007-09-16 18:38:08 · 7 answers · asked by Anonymous in Mathematics

Classify the following as true or false.
A ray has two endpoints.
A line segment contains an infinite number of points

2007-09-16 18:32:06 · 4 answers · asked by Anonymous in Mathematics

The "normal" lead content in human blood is about 0.40 part per million (that is 0.40 g of lead per million grams of blood). A value of 0.80 part per million (ppm) is considered to be dangerous. How many grams of lead are contained in 6.0 x 10^3 (six times 10 to the third power)(the amount in an average adult) if the lead content is 0.62 ppm?

2007-09-16 18:29:48 · 4 answers · asked by lil_vicd 2 in Mathematics

2007-09-16 18:29:09 · 2 answers · asked by Anonymous in Physics

Find the change in velocity





please help me i am a stupid guy who will never stand on my own i can just rely on smart and above-classed people in this world who will probably get way better careers than me ill do anything for you if we ever meet!

2007-09-16 18:28:46 · 1 answers · asked by a idiot with dreams of wiseman 1 in Mathematics

Find the x and y intercepts

f(x) = 9x^2 + 24x + 16

2007-09-16 18:27:32 · 7 answers · asked by Anonymous in Mathematics

2007-09-16 18:27:04 · 4 answers · asked by mrscoleman85 1 in Medicine

goes west 30 km from A-town to C-city, then 30 km south to D-burg, 12km west to E-town and 30 km N<45>E to B-Ville.

a) what is the shortest distance from A-town to B-ville?


b) if the express but takes 0.45 hours to go from A-town to B-ville, and the local bus takes 3.0 hour, calculate the average velocity for each bus.


please help me i am a stupid guy who will never stand on my own i can just rely on smart and above-classed people in this world who will probably get way better careers than me ill do anything for you if we ever meet!

2007-09-16 18:26:25 · 2 answers · asked by a idiot with dreams of wiseman 1 in Physics

If so, some examples? Or a quick explanation. Thank you.

2007-09-16 18:23:19 · 4 answers · asked by thnbgr1 1 in Physics

Please show work.
- Thanks

2007-09-16 18:22:04 · 1 answers · asked by Nik 1 in Mathematics

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2007-09-16 18:21:13 · 8 answers · asked by Anonymous in Mathematics