Science & Mathematics - 10 September 2007

2007-09-10 18:17:39 · 18 answers · asked by Anonymous in Physics

Why would we fake it six times?

From the new movie "In the Shadow of the Moon".

2007-09-10 18:17:27 · 9 answers · asked by Bob 7 in Astronomy & Space

when i was in third grade, my teacher taught that there are more than 9 planets. is it true?

2007-09-10 18:17:11 · 12 answers · asked by FaithBreakFree♥ 3 in Astronomy & Space

If f is a function, does f(s+t)=f(s) +f(t)

If X1f(X2)

2007-09-10 18:16:39 · 3 answers · asked by Anonymous in Mathematics

i smoked pot this past friday and i just got this job randomly so i just want to know if i will pass if i do get drug tested. i usually dont smoke. this is like my 5 time ever doing it any help please??

2007-09-10 18:14:10 · 7 answers · asked by Anonymous in Medicine

two flasks are connected with a stopcock. the first flask has a volume of 5 liters and contains nitrogen gas at a pressure of .75 atm. the second flask has a volume of 8L and contains oxygen gas at a pressure of .125 atm. when the stopcocl between the flasks is opened and the gases are free to mix what will the pressure be in the resulting mixture?

2007-09-10 18:12:15 · 1 answers · asked by hii 1 in Chemistry

if I know the substance has a vapor pressure of 40 torr at 673 C and 100 torr at 736 C?
please tell me the formulas!!!!!!!
the unit is K

2007-09-10 18:06:00 · 1 answers · asked by siying 1 in Chemistry

How can you fuse DNA?

2007-09-10 18:03:11 · 9 answers · asked by Rhianna T 1 in Biology

2007-09-10 18:02:39 · 2 answers · asked by Dan B 1 in Weather

chemstry

2007-09-10 17:52:57 · 3 answers · asked by karen m 1 in Chemistry

Can some one please explain Phylogeny to me so I can actually understand it.....

2007-09-10 17:51:23 · 2 answers · asked by ladyb_from_gridlock 1 in Biology

2007-09-10 17:47:56 · 9 answers · asked by engelfeurs 2 in Astronomy & Space

Can you please tell me the solution and how you did it I have basically no knowlege on writing chemical equations for chem...

What compound do these two ions form?
AL^3+ and O^2-

Thank you.

2007-09-10 17:46:04 · 5 answers · asked by billf39 2 in Chemistry

+F*cos(ϑ)-3000=0
+F*sin(ϑ)+1000=0

2007-09-10 17:43:31 · 4 answers · asked by Midlothian 2 in Mathematics

2007-09-10 17:40:56 · 4 answers · asked by Evy 1 in Mathematics

since all the leds are connected, how are adjacent leds off/on?

2007-09-10 17:39:41 · 2 answers · asked by J R 1 in Engineering

glass is a liquid
it is so viscous that you think it's a solid
but when many years pass, you'll see that the lower part of the glass is much thicker than the upper part because it will take manyyears to flow........
thanks..........

2007-09-10 17:37:03 · 17 answers · asked by Anonymous in Other - Science

2007-09-10 17:35:46 · 2 answers · asked by Anonymous in Physics

We just had our Wartsila-Cummings and Leroy Somer generator being serviced – taken out to a workshop and after the repair, reinstalled back at our plant. The repair is for the engine parts only – the alternator parts were only serviced.



The alternator is Leroy Somer LSA 54M75, 2450 KVA, 415 V, 50 Hz, 4 poles. AVR is Leroy Somer R 449 and R 726 (see attached diagrams). After the installation we could not get the voltage ( we get 50 V instead of 415V). Site reps has checked the connections and even testing the AVR - OK.

At this time the contractor rep. did try to use an external battery – he did connect an external battery to the excitation unit for 2 seconds during rated speed and managed to get the 415 VAC as required. But when he put back the R 449 connection back to the excitation unit – we could not get the voltage level of 415 V but manage only get 50 V.



R 449 has connection from an auxilliary winding for power supply, we measured the voltage level of this auxilliary winding during rated speed and get about 88V.



Another guy came in yesterday and brought in external battery 12 V 200AH and connected to the excitation unit (he removed the cables from R 449 to the excitation unit and connected that to the battery). He did not disconnect other cables. After running for 2 minutes to rated speed, the cables from auxilliary winding to the R 449 got burnt and we stopped the test. However during the test we did get the voltage of about 488 V at the terminal.



The differential relay tripped at this time even though the genset was running without any connection to the bus-bar.





Hope to get your assistance.



Thank you

2007-09-10 17:34:18 · 4 answers · asked by MU fan 1 in Engineering

For my biology, the question is....Which of these animals would you think is most related to a hawk: a shark, a bat, or an alligator? Explain what morphological criteria you used to make your choice.

I know which one is most related to the hawk but how do i explain the morphological criteria. This part is kind of confusing me.....what exactly is the morphological criteria???

2007-09-10 17:33:20 · 2 answers · asked by ladyb_from_gridlock 1 in Botany

2007-09-10 17:33:11 · 4 answers · asked by JRK 1 in Biology

how would you find the standard form of an equation of a circle if only given the end points of a diameter?

endpoints of a diameter:(0,0) (6,8)

2007-09-10 17:29:30 · 9 answers · asked by yofosho 1 in Mathematics

That is, I want to be able to enter the function and then get the derivative, and if this site solves integrals, that would be awsome!! .... I used to know one for free... but I can't find it anymore!! THANK YOU SO MUCH!!!

2007-09-10 17:23:57 · 2 answers · asked by StrawberrySmoothie 2 in Mathematics

The gemstone, what is thier use, other than looking stylish and "hip."
I have a report due, and i cannot find much more information on these gems other than they are used for lasers.

Any other information/sites would be helpful, i know where the rubies came from and how they are more valuable than diamonds, sometimes. Mohs hardness of it:- 9.

Any and all input, PLEASE!!

&thank you

2007-09-10 17:23:12 · 6 answers · asked by :D 1 in Earth Sciences & Geology

x^2= x to the second power, you are suppose to use the quadratic formula -4 + or - the square root of b^2-4ac/2a

2007-09-10 17:21:01 · 6 answers · asked by A_FAST_DUDE 2 in Mathematics

three terms are in Arithmetic progression. if their sum is 21 and the sum of their squares is 149, what are the numbers?

2007-09-10 17:20:19 · 2 answers · asked by poiuyt 2 in Mathematics

A basketball player, standing near the basket to grab a rebound, jumps 76.0 cm vertically. How much total time does the player spend (a) in the top 15.0 cm of this jump and (b) in the bottom 15.0 cm? Does this help explain why such players seem to hang in the air at the tops of their jumps? Show and explain your work. Thanks and good luck! :)

2007-09-10 17:19:19 · 1 answers · asked by Anonymous in Physics

hi recently i have benn diagnosed with 3 different kinds of psorisis and i am to have some labs done in the next day or 2.i understand all my other labs but the dr, ordered a ua dipstick only.what will they be testing for? thank you

2007-09-10 17:18:49 · 2 answers · asked by kelleyandjohn2000 1 in Medicine

Hi,
I'm doing a lab and it consists writing a procedure on how to seperate mixture of sodium chloride, silicon dixoide and calcium carbonate.
Well I figured out how to separate sodium chloride from the other ones. But how do i separate calcium carbonate and silicon dioxide?

2007-09-10 17:17:52 · 2 answers · asked by Jiwoo S 1 in Chemistry

i dont really get this addition/ minus as well as division and multiplication

please show me the steps and explain it to me in simple English
and please solve these questions
500 - 3.7
500. -83.35

2007-09-10 17:16:55 · 1 answers · asked by Anonymous in Chemistry