Science & Mathematics - 11 February 2007

x + y = 5
3x - y = 3

2007-02-11 02:21:15 · 6 answers · asked by melissa a 1 in Mathematics

the nightlight in my kids' bedroom is shining more brightly than it did before. It's bright enough to read by now! It's a standard 7.5W bulb (240V AC) plugged into a powerboard which is plugged into the wall. I did nothing but just one night it was shining more brightly

2007-02-11 02:15:51 · 1 answers · asked by nangari 3 in Other - Science

We have come to know that saturn has come near to Earth.So,I want to now that can we see it by our naked eyes in mumbai as there is somuch brightness in mumbai.

2007-02-11 02:14:29 · 11 answers · asked by ankita n 1 in Astronomy & Space

What is the acceleration of a 40-kg block of cement when pulled sidways with a net force of 200N?
Can anyone show me how to figure this out?

2007-02-11 02:10:58 · 6 answers · asked by angelgirl 2 in Physics

If there should be a low of 46 and a high of 53, for example, when is the low measured-? Does the day run from midnight to midnight, from 6 am to 6pm., or otherwise?

I've frequently seen the forecast of a "low" that is higher than the actual of that of the early morning.

2007-02-11 02:10:16 · 3 answers · asked by fmcclain 1 in Weather

2007-02-11 02:09:22 · 1 answers · asked by goring 6 in Astronomy & Space

Boots are to sell Viagra over the counter. Will they be able to keep up with the demand?

2007-02-11 02:07:59 · 2 answers · asked by footynutguy 4 in Medicine

2007-02-11 02:07:35 · 1 answers · asked by sneha 1 in Physics

2007-02-11 02:07:29 · 2 answers · asked by goring 6 in Astronomy & Space

Gravel is dropped into a conveyor belt @ 0.4 kg/s. Find the extra force required to keep the belt moving at a speed of 4 m/s.

My doubt is, since the gravel is being dropped vertically, it should have no affect on the horizontal motion of the belt, as vertical & horizontal components of any vector quantity do not affect each other. So, please explain the answer & rectify me if I'm wrong.

2007-02-11 02:06:12 · 2 answers · asked by Kristada 2 in Physics

how do i parametrise the paraboloid given by the equation: z = x^2 + y^2? a step by step solution would be greatly apprieciated. thanks.

2007-02-11 02:05:19 · 2 answers · asked by drummanmatthew 2 in Mathematics

Its idea is to find the gradient of a certain point on a graph, right?
How does it work?

Thanks for your time :)

2007-02-11 02:04:17 · 3 answers · asked by cloudbunny 1 in Mathematics

2007-02-11 02:01:48 · 21 answers · asked by Prince 1 in Biology

2007-02-11 02:01:19 · 2 answers · asked by Skyline 4 in Medicine

2007-02-11 01:59:58 · 23 answers · asked by suzzerlingsuzy2000 2 in Weather

2007-02-11 01:59:00 · 23 answers · asked by suzzerlingsuzy2000 2 in Weather

For example, Sulfite, Sulfate, Sulfide. What is the difference between these endings?

2007-02-11 01:54:55 · 2 answers · asked by Toothie 2 in Chemistry

for example, how to convert (4516) in base 6 to base 10?


thanks

2007-02-11 01:53:01 · 8 answers · asked by Anonymous in Mathematics

2007-02-11 01:52:50 · 7 answers · asked by sara w 2 in Medicine

2007-02-11 01:52:14 · 3 answers · asked by TammyT 1 in Earth Sciences & Geology

2007-02-11 01:51:31 · 4 answers · asked by red 1 in Chemistry

it's 11 right now Sunday AM, next sunday will be -5 below (without wind chill) i'm in INDY (home of the Colts)

2007-02-11 01:47:51 · 21 answers · asked by Anonymous in Weather

2007-02-11 01:47:42 · 9 answers · asked by Sid 2 in Physics

:) :) :) :) :) :)

2007-02-11 01:45:01 · 5 answers · asked by m e 1 in Astronomy & Space

Can magnesium bond with hydrogen? If yes, how?

2007-02-11 01:42:29 · 4 answers · asked by Elisa 2 in Chemistry

y = 2/3x
y = - 1/3 x + 6

2007-02-11 01:40:48 · 3 answers · asked by steph158_4 1 in Mathematics

y = 3/5 x - 3
2x - y = - 4

2007-02-11 01:37:46 · 4 answers · asked by melissa a 1 in Mathematics

I'm using a piezoelectric igniter (brand name, Lightnin' Bug, sold for acetylene torches) which I bought specifically so I wouldn't have to keep matches around the kitchen. I've tried it on my stove, it won't work, on a butane lighter, on a paper towl soaked with ether. Nothing lights! I'm astonished.

Is the ignition energy for acetylene THAT MUCH lower than that of producer gas, that these sparks won't light anything else...? I know that the spark TEMPERATURE should be high enough, and I had read of a piezo device being used to ignite wood alcohol, that's why I figured it would have to work. 10 points to the one who can clear up this mystery for me.

(In the meantime, please don't be worried, on my behalf. I've gone back to using matches for the time being, there are no kids or pets in the house and I'm not leaving flammables around. I'm in no danger of fire or explosion.)

2007-02-11 01:36:38 · 7 answers · asked by cdf-rom 7 in Physics

Ofcourse, there is always the race to the nearest washroom midway through the day: Paul and Robbie decide to have a race. The sign indicates the washrooms are 200 m away. if Paul runs 3.0 m/s and Robbie at 3.5 m/s, How much time does the winner wait for the other person at the washroom?

2007-02-11 01:34:26 · 6 answers · asked by avant1991 3 in Physics

If xSin^3A + yCos^3A = SinA and xSinA - yCosA = 0,
Prove that:
x^2 +y^2 =1

2007-02-11 01:33:15 · 3 answers · asked by INTEGRITY 1 in Mathematics