Science & Mathematics - 31 October 2007

2007-10-31 12:57:36 · 10 answers · asked by pualla walla 1 in Mathematics

Write two linear equations you can use to graph y = |-2x - 3|.

**Multiple Choice**
A. Y = 2x - 3 ; Y = -2x + 3
B. Y = 2x - 3 ; Y = 2x + 3
C. Y = -2x + 3 ; Y = 2x + 3
D. Y = -2x - 3 ; Y = 2x + 3

2007-10-31 12:52:05 · 1 answers · asked by Anonymous in Mathematics

2007-10-31 12:52:01 · 3 answers · asked by Terri L 2 in Biology

In my bathroom at home (south UK) we have a real problem with harlequin ladybirds (NOT native to the UK).

Is there any way to prevent them from coming into the house at all (other than polyfilling all the hairline cracks and having windows and doors permanently sealed)?

I'm asking this because I'd like to know how to get rid of them without using thing spoisonous to humans if at all possible.

I'm asking about the nests because one time my brother discovered 30 of them in a clump on the bathroom ceiling. Plus we seem to get those ladybirds in the house most days.

Please help!

2007-10-31 12:51:06 · 3 answers · asked by swelwynemma 7 in Zoology

since stars are born in molecular clouds. Is our solar system in or near a molecular cloud?

2007-10-31 12:49:36 · 7 answers · asked by Anonymous in Astronomy & Space

two blocks, of mass m1 = 250 g and m2 = 700 g, are connected by a massless cord that is wrapped around a uniform disk of mass M = 500 g and radius R = 12.0 cm. The disk can rotate without friction about a fixed horizontal axis through its center; the cord cannot slip on the disk. The system is released from rest.

a) Find the magnitude of the acceleration of the blocks.
=.......m/s^2
(b) Find the tension T1 in the cord at the left.
=.......N
(c) Find the tension T2 in the cord at the right.
=........N

2007-10-31 12:48:59 · 1 answers · asked by Nikita 1 in Physics

2007-10-31 12:47:40 · 1 answers · asked by adidasblack16 1 in Physics

They are basicly the samething one's just stronger than the other...

2007-10-31 12:46:44 · 2 answers · asked by Anonymous in Chemistry

I don't know if the stars that make up the dippers are near each other or just line up because of the position we view them from. Since interstellar travel is likely an impossibility perhaps an advanced alien civilization sent the only message it could by spawning suns in a pattern?

2007-10-31 12:46:24 · 5 answers · asked by Oxl 7 in Astronomy & Space

1. The surface area of a sphere is decreasing at the constant rate of 3π cm²/sec. At what rate is the volume of the sphere decreasing at the instant its radius is 2 cm?


2. At noon, a ship sails due north from a point P at 8 knots/hr. Another ship, sailing at 12 knots/hr, leaves the same point 1 hour later on a course 60º east of north. How fast is the distance between the ships increasing at 2:00 PM? at 5 PM? Hint: Use law of cosines : a² = b² + c² - 2bc cos A

3. A fly is crawling from left to right along the top of the curve y= 7 - x². A spider waits at the point (4,0). Find the distance between the two insects when they first see each other.

Thanks

2007-10-31 12:44:42 · 2 answers · asked by BigE-zy 2 in Mathematics

Im not gonna aim at ppl but does it hurt if on flys and hits you?

2007-10-31 12:43:33 · 3 answers · asked by tommy_li05 1 in Physics

I need the website right away for a project and I need to know what kind , the origin, and some informatiion on different type of leaves that I have found.

2007-10-31 12:35:38 · 1 answers · asked by braidsbyj07 1 in Botany

Calculate the pH of the solution that results from the addition of 0.020 moles of HNO3 to a buffer made by combining
0.500 L of 0.060 M NH4Cl ( use Ka = 5.60 x 10 -10 )
and 0.500 L of 0.120 M.


The question is apparently cut off at the, but I believe you do not have to necessarily know the substance, since NH4Cl is a salt.

pKa=9.25181


Everytime I have done this problem, I have gotten an incorrect answer. Please help. I have been using the Henderson-Hasselbalch equation to solve this.

(-log(5.60 x (10^(-10)))) + log(.01 / .08) = 8.34872199

I don't understand what I'm doing wrong.

I thought that maybe if I switched it up (I don't know why), it would work but that is also wrong.

(-log(5.60 x (10^(-10)))) + log(.08 / .01) = 10.154902

2007-10-31 12:35:03 · 1 answers · asked by Sage 1 in Chemistry

2007-10-31 12:34:59 · 8 answers · asked by Mukesh Dak 3 in Engineering

2007-10-31 12:31:54 · 10 answers · asked by anagel1532 1 in Geography

please filll in the blank

2007-10-31 12:31:51 · 2 answers · asked by ABC 2 in Physics

A skateboard track has the form of a circular arc with a 4.25 m radius, extending to an angle of 90.0° relative to the vertical on either side of the lowest point, as shown in Figure 8-27. A 63.0 kg skateboarder starts from rest at the top of the circular arc.
http://i214.photobucket.com/albums/cc30/bkoz319/08-24alt.gif

(a)What is the normal force exerted on the skateboarder at the bottom of the circular arc?
___kN




Thanks for your time!!!!

2007-10-31 12:31:42 · 1 answers · asked by SurferGirl9 1 in Physics

2007-10-31 12:30:43 · 18 answers · asked by baby gurl 4 in Geography

There is a large orange spider in SF CA and I would love to know what it is

2007-10-31 12:28:29 · 5 answers · asked by Gymnast!!! 1 in Zoology

can any one factor -6x^2 -5x + 4 ? thanks

2007-10-31 12:27:27 · 3 answers · asked by nikeballer15 2 in Mathematics

Whoever can answer all three questions correctly first will be awarded 10 points! I guarentee!

1) In recent years, more and more Americans have found jobs in:
a) agriculture and food processing
b) manfucaturing and trade
c) service industries
d) mining and lumbering

2) Which of the following best defines the South's climate?
a) humid subtropical
b) warm and semiarid
c) humid continental
d) temperate

3) Which of the following is true of the Northeastern's jagged shoreline?
a) hindered farming
b) makes fishing impossible
c) provides harbors
d) few sandy beaches

Good Luck!!

2007-10-31 12:26:13 · 4 answers · asked by Young Einstein 3 in Earth Sciences & Geology

If f(x) = 3 \sqrt{x} (x^3- 4 \sqrt {x} +2 ), find f'( 16 ).

2007-10-31 12:26:13 · 1 answers · asked by Jenny S 2 in Mathematics

Would anyone happen 2 kow that. I have felt 2 this week and want to know if there will be any more. One was 5.6 the other 3.5. I have been so scared. So please answere my question. I hate earthquakes so please answere bye

2007-10-31 12:22:36 · 8 answers · asked by Cheyenne M 2 in Earth Sciences & Geology

a small man realized he couldnt finish his pizza in fact he could only eat exactly half of it.

If the diameter of the pizza was 50cm, and it was a perfect semicircle, what is the area of the smallest square box, in square centimetres, that could contain the half pizza? Please disregard the thickness of the box, round to the nearest whole number, and please only submit a number for your answer.

2007-10-31 12:22:01 · 3 answers · asked by Anonymous in Mathematics

I firmly believe that extraterrestrial races have been visiting earth for thousands of years. I have read hundreds of accounts of contact, and carefully reviewed transcripts of radar showing impossible aerodynamics. There are thousands of documented cases, each with hundreds of witnesses. It can't all be a hoax or mistaken identity.

However, when it comes to stories of human contact with aliens, something doesn't seem quite right. I have never read about aliens being fascinated with our culture. You would think that they would comment about the astounding array of human arts, everything from sculptures to modern painting. If aliens really have had contact with humans, why have I never read any account of their impression of our culture?

Also, unless there is some "Prime Directive" about non-interference in another culture (ala Star Trek), why has no alien ever offered some new technology to help make wars obsolete?

Something seems to be amiss. What is your opinion?

2007-10-31 12:21:46 · 12 answers · asked by pachl@sbcglobal.net 7 in Astronomy & Space

If you split a rectangle in half by its diagonals, do the resulting ratios for the triangles side lengths become a 30-60-90 triangle? (2:sqrt(3):1)

2007-10-31 12:20:26 · 3 answers · asked by Anonymous in Mathematics

what is the difference during a lab?

2007-10-31 12:19:40 · 1 answers · asked by GhostVault 23 2 in Chemistry

If the earth has great mountains, such as the Himalayas, in some places and great valleys, such as Death Valley etc. in other places, how does it appear perfectly round and why do all the planets in our solar system appear perfectly round?

2007-10-31 12:18:31 · 6 answers · asked by billie d 1 in Astronomy & Space

a small man realized he couldnt finish his pizza in fact he could only eat exactly half of it.

If the diameter of the pizza was 50cm, and it was a perfect semicircle, what is the area of the smallest square box, in square centimetres, that could contain the half pizza? Please disregard the thickness of the box, round to the nearest whole number, and please only submit a number for your answer.

2007-10-31 12:18:10 · 2 answers · asked by Anonymous in Mathematics

Years ago it was considered Science Fiction. Maybe years from now paranormal will be considered a true part of Science too.

2007-10-31 12:17:54 · 11 answers · asked by Deenie 6 in Other - Alternative