Science & Mathematics - 21 October 2007

Put the following equation into y=a(x-h)^2 + k
vertex is v(h,k)

y=3x^2 - 5x + 2

help! step by step please :)

2007-10-21 14:08:42 · 1 answers · asked by psxiloveyou 2 in Mathematics

At 20.0°C, a mainly silicon resistor has a resistance of 585 Ω, and a tungsten resistor has a resistance of 752 Ω. At this temperature, the silicon resistor has a temperature coefficient of resistivity of −0.070°C−1 and the tungsten resistor has a coefficient of 0.0050°C−1.

2007-10-21 14:06:37 · 1 answers · asked by Rachel H 1 in Physics

Let f: X->Y be a function, and suppose that x0 exists in X and y0 exists in Y and satisfy (x0, y0) exist in f. If (x,y) exists in f and x != x0, then y != y0.

I really have no idea what I am even supposed to prove any explanations would be greatly appreciated :)

2007-10-21 14:04:57 · 1 answers · asked by jay d 1 in Mathematics

2007-10-21 14:04:47 · 4 answers · asked by Bec 2 in Weather

plz list month, week, yr... if u can thx

2007-10-21 14:04:40 · 5 answers · asked by Anonymous in Medicine

1. A Farmer uses a horizontal force of magnitude on a wagon and moves it a horizontal displacement of magnitude 3.2m. How much work has the farmer done on the wagon?

2. A tow truck does 3.2 kJ of work in pulling horizontally on a stalled truck to move it 1.8 m horizontally in the direction of the force. What is the magnitude of the force?

3. A store clerk moved a 4.4 kg box of soap without accleration along a shelf by pushing it with a horizontal force of magnitude 8.1 N. If the employee did 5.9 J of work on the box, how far did the box move.

W=FD

2007-10-21 14:02:39 · 1 answers · asked by Anonymous in Mathematics

are displacement and force in hooke's law always opposite in signs?

2007-10-21 14:01:17 · 3 answers · asked by sathi 2 in Physics

In physics we did a lab and shot rockets at different angles. I can't figure out these answers.

My only known information is the fifteen degree theta angle at which we shot it, and that the time was 1.77 seconds before it hit the ground. (also, it is known that when going up there is no acceleration, and going down the acceleration is -9.81 m/s/s)

I need:

1] intial vertical velocity at the time of launch, in m/s
2] max height reached in meters and feet
3] resultant velocity at which the rocket was launch in m/s and mi/h
4] horizontal velocity in m/s
and 5] horizontal range in meters and feet.

We have to use the kinematic equations, trig functions, and the pythag. theorem.

help?

2007-10-21 13:59:16 · 1 answers · asked by CL 1 in Physics

Having trouble with these homework problems. Any help would be greatly appreciated!!

Find the parametric equations of the tangent line at the point (-2,2,4) to the curve of intersection of the surface z= 2x^2 -y^2 and the plane z= 4.

Also, another problem that I could not figure out which deals with partial derivitives is:

A package in the shape of a rectangular box can be mailed by U.S Parcel Post if the sum of its length and girth (the perimeter of a cross-section perpendicular to the lengh) is at most 108 in. Find the dimensions of the package with largest volume that can be mailed by Parcel Post.

Thanks for any help again:)

2007-10-21 13:58:36 · 2 answers · asked by JOE 2 in Mathematics

2007-10-21 13:58:28 · 6 answers · asked by Moe J 1 in Weather

Is that so? If not, then could you tell me what exactly sin (-1/2) is equals to ___ degree? I'm confused..thanks!

2007-10-21 13:50:57 · 6 answers · asked by Anonymous in Mathematics

it takes 100joules of work to push a piano across the width of a stage.how wide is the stage , if the force used to push the piano is 5 newtons?

2007-10-21 13:46:43 · 3 answers · asked by :}smile :} 1 in Mathematics

baking soda and vinegar chemical reaction.
describe the reaction

2007-10-21 13:44:28 · 5 answers · asked by Anonymous in Chemistry

2007-10-21 13:43:17 · 5 answers · asked by S 2 in Mathematics

Ff=4.0n on a 5.0kg blocky
ff=8.0n on a 10kg blockx
fa=30n south on blockx
calculate the action and reaction forces.

2007-10-21 13:41:00 · 1 answers · asked by Anonymous in Physics

All opinions will be respected and everyone else please refrain from thumbing down others ideas. I just had an interesting debate with my husband about this and I wanted to extend it to the Y/A family to see what everyone else thinks about this timely topic.

Thanks!

2007-10-21 13:40:28 · 7 answers · asked by Michelle 4 in Weather

meets with cold air and why?? i googled it but ntohing came up so please do help

2007-10-21 13:40:23 · 4 answers · asked by Anonymous in Weather

2007-10-21 13:39:10 · 3 answers · asked by Anonymous in Physics

Which has more heat in it: a bathtub full of warm water or a drinking glass full of water at the same temperature? Use common sense and scientific logic to explain your reasoning

2007-10-21 13:38:35 · 3 answers · asked by Becky O 1 in Weather

Solve for a and b

1. y=3x-5
a)0,? b)3,?
2. 2x-5y=12
a)1,? b)?,4
3. 3x+4y=24
a)4,? b)?,6

2007-10-21 13:35:31 · 9 answers · asked by Scarlet 2 in Mathematics

2007-10-21 13:35:25 · 1 answers · asked by KP 1 in Botany

2007-10-21 13:33:44 · 3 answers · asked by wow 4 in Earth Sciences & Geology

2007-10-21 13:29:38 · 21 answers · asked by Anonymous in Astronomy & Space

2007-10-21 13:27:23 · 5 answers · asked by Anonymous in Mathematics

2007-10-21 13:26:17 · 7 answers · asked by Amy H 1 in Mathematics

2007-10-21 13:25:45 · 1 answers · asked by Anonymous in Mathematics

(since it is based around and narrated by the voice of Mary Alice who died in the first show. )(I know this is stretching it...just trying to understand the meaning of these terms still)

2007-10-21 13:23:12 · 7 answers · asked by Deenie 6 in Paranormal Phenomena

Help!

My little sister is supposed to do an assignment for school that involves finding the populations of some major cities in the world, and finding out wich large body of water these cities are located on/near and what makes them so popular. It was supposed to be a group assignment, but they only had 20 minutes to work on it, and the other half of her group doesn't want to co-operate with her..
We already know the population of the cities but could SOMEONE PLEASE, help us out on what major body of water the fallowing cities are located on? Any help is seriously appreciated!

- Moscow
- Beijing
- New York
- Tokyo
- London
- Hong Kong
- Mexico City
- Amsterdam
- Sydney
- Shanghai

2007-10-21 13:23:07 · 5 answers · asked by Anonymous in Geography

It would require a lot of force to open a safe underwater, like they did in the Italian Job.

I am looking for an equation that would figure out how much force you will need to open an airtight container [such as a safe] underwater, also, under different depths.

Thanks

2007-10-21 13:21:25 · 2 answers · asked by G S 1 in Physics

A cylinder fitted with a piston contains 5.00L of a gas at a pressure of 4.00atm. The entire apparatus is contained in a water bath to maintain a contant temp. of 298K. The piston is released and the gas expands until the pressure inside the piston is 1atm. Assume ideal gas behavior and calculate the amount of work done by the gas as it expands at a constant pressure.

2007-10-21 13:18:30 · 1 answers · asked by stnicholas6496 4 in Chemistry