Science & Mathematics - 1 August 2007

The Point With CO-ordinates (1,3) and (3,9/2) lies on the line with the equation

ax-by = 2

a)find the value of 'a' and 'b' ?
b)Find the Gradiant of the line ?

2007-08-01 05:27:34 · 5 answers · asked by vishnu 1 in Mathematics

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15

+ 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23+ 24 + 25 + 26 + 27 +

28 + 29 + 30 + 31 + 32 + 33 + 34 + 35 + 36 + 3x+ 38 + 39 +

40 + 41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49 + 50 + 51 +

52 + 53 + 54 + 55?

2007-08-01 05:25:09 · 6 answers · asked by Anonymous in Mathematics

Express as a single fraction in lowest terms

(2t-7y) / (3t) + (5t+9y) / (2t) +1

2007-08-01 05:24:16 · 4 answers · asked by Anonymous in Mathematics

a) ahead of the duck,
b) right at the duck, or
c) behind the duck?

More specifically:
speed ot the train 300ft/s,
airspeed of the duck 75ft/s,
distance to the duck 500ft,
weapon is M16, muzzle velocity 3000ft/s.

-------duck--75>
.
.
.
500ft.
.
.
-------M16---------300>

2007-08-01 05:22:09 · 4 answers · asked by Alexander 6 in Physics

2007-08-01 05:21:29 · 3 answers · asked by Anonymous in Mathematics

2007-08-01 05:21:12 · 2 answers · asked by crazytoad11 2 in Astronomy & Space

A satellite is put into a certain orbit in space at 1000 kilometer above see level. The total mass of satellite is 500 kilogram. Find the velocity of the satellite at which the orbit is maintained in space indefinitely. What is the centripetal force and the centrifugal force acting on the satellite during orbit? Thank you

2007-08-01 05:17:09 · 4 answers · asked by lonelyspirit 5 in Astronomy & Space

2007-08-01 05:12:42 · 4 answers · asked by ? 5 in Physics

I'm using the vinegar to try to remove a mole and want stronger acid to make it work faster.

I tried evaporating the water by leaving the cap off the vinegar bottle, but after 3 days the vinegar is at the same level as when I started! So now I want to try boiling it. Will this work? Will it harm my plastic electric kettle that seems to have a teflon coated heating element? Thanks.

2007-08-01 05:11:16 · 5 answers · asked by Marvin 1 in Chemistry

Well for two days in early MArch, we had temps reaching 81 and 60 degree dewpoints in Detroit. The last day of if ended with Severe Thunderstorms producing Flooding and Damaging Hail in Spots. The very next day, we went from the low 80s to the Upper 20s with Lake Effect Snow.

Then another scenario, one day, we had 70 degree temps in late MArch/early April so we saw some evening Instability Rain Showers that produced some pretty heavy rain witha 60 degree dewpoint. About 5 hours later, it was like a blizzard outside with snow falling like crazy. The next morning we woke up to an inch of it.

2007-08-01 05:08:54 · 10 answers · asked by Anonymous in Weather

i am doubted whether rocket principle and recoil is better explained by law of conservation of momentum or newton's third law. please help me in a detailed manner

2007-08-01 05:05:59 · 9 answers · asked by newtonian 2 in Physics

You know, the Instability/Lake Effect Thunderstorm like Snow Showers?

I love them. I've seen some Thundersnow squalls in Detroit that produced near Severe Wind Gusts (50 MPH or higher). One in particular occurred the same date that Buffalo saw that terrible Lake effect Thundersnow Storm (last October). The squall was forming Anvil-Shaped Tops and everyting.

2007-08-01 05:05:20 · 5 answers · asked by Anonymous in Weather

Find the length of a side of a cube if the volume is 800cm^3. Round the answer 3 decimal places

2007-08-01 05:04:37 · 13 answers · asked by ascension43930 1 in Mathematics

2007-08-01 05:03:13 · 2 answers · asked by Anonymous in Chemistry

and we don't know what else could be out there.... what do you think??

2007-08-01 05:03:09 · 6 answers · asked by Anonymous in Astronomy & Space

2007-08-01 05:00:40 · 16 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-01 04:59:06 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Why is the universe so ghastly huge?

2007-08-01 04:59:01 · 4 answers · asked by Balrog 2 in Astronomy & Space

Taylor Series and Calculus

2007-08-01 04:55:35 · 3 answers · asked by persistentd 1 in Mathematics

2007-08-01 04:53:43 · 3 answers · asked by Sarah F 1 in Weather

or the x-ray?

plz explain

2007-08-01 04:53:04 · 4 answers · asked by Anonymous in Medicine

If y is given by a composite function of x, use the Chain rule to show that

d^2y/dx^2 = d^2y/du^2 * (du/dx)^2 + dy/dy * d^2u/dx^2

How does one differentiate dy/dx = dy/du * du/dx to get the above?

2007-08-01 04:52:20 · 3 answers · asked by Anonymous in Mathematics

6% of n = 9
and
80% of n = 20
What is the formula used to figure these out? I've done them twice for my kid but the answers are not on the answer sheet. I think the answer sheet is incorrect. Thanks

2007-08-01 04:49:14 · 8 answers · asked by oldbridgenj 1 in Mathematics

2007-08-01 04:44:45 · 7 answers · asked by SadToday22 3 in Mathematics

I understand why the first derivative should be zero to find out if a point is a local maxima/minima..... but can someone explain in layman's terms as to why the second derivative will help us to decide if a function is local/global maxima/minima.... what is the geometric explanation ?

2007-08-01 04:42:45 · 6 answers · asked by Pure_Blue_Poison 2 in Mathematics

2007-08-01 04:40:17 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-08-01 04:39:25 · 8 answers · asked by cozman 1 in Astronomy & Space

What Rice Puller Does? I have a metal which attratcts rice...I heard that Satelite companies use this metal... and heard that NASA uses this...cost is around $500 million. Please let me know if this is a fact or a scam... I will appreciate your help and would like to do a business with you...if you can help to market this out of India.

2007-08-01 04:38:24 · 1 answers · asked by RAGHU 1 in Earth Sciences & Geology

2007-08-01 04:38:05 · 9 answers · asked by Anonymous in Astronomy & Space

some people says that if you are afraid of an animal(dogs bears tigers lions cheatas wild catsand bulls) never look at them in the face.

2007-08-01 04:37:49 · 6 answers · asked by Rosalinda 7 in Zoology