Science & Mathematics - 17 July 2007

why does this ordered pair NOT represent a function? plzz explain thanks!

(3,-2) (3, -4) (4, -1) (4, -3)

2007-07-17 06:59:11 · 2 answers · asked by ? 1 in Mathematics

I have a circuit with a constanst voltage source a resistor in parallel to the voltage source and a capacitor in parallel with the resistor and a resister perpendicular to the voltage source and the other resistor. I've calculated the resistance but it differs from those that I've calculated through Ohms laws calculates I've found on the web. Is the variation because Ohms law wont work when there is a capacitor in the circuit?
For example I used this calculator: http://www.anderson-bolds.com/calculator.htm

2007-07-17 06:54:23 · 5 answers · asked by kells_2010 1 in Engineering

2007-07-17 06:53:56 · 3 answers · asked by Joanie G 1 in Medicine

Iv been looking at doing voluntary work with animals an really find any good placements. Iv looked at places around where i live (Sheffield area) and not found much choice. Iv also looked at going to work abroad like in South Africa for two weeks and i was shocked to see how much these trips cost. Does anyone know of anywhere near Sheffield that would take on a volunteer or of a site that;s got cheap voluntary work abroad?

2007-07-17 06:49:56 · 3 answers · asked by Sophie H 4 in Zoology

2007-07-17 06:49:20 · 9 answers · asked by yuleydis77 1 in Mathematics

2007-07-17 06:47:30 · 7 answers · asked by yuleydis77 1 in Mathematics

a railroad car of mass 2.5 times 10^4 kg is moving with speed of 4.00 m/s. it collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with initial speed of 2 m/s.
How much mechanical energy is lost in the collision?

2007-07-17 06:45:05 · 4 answers · asked by animelover 2 in Physics

2007-07-17 06:44:34 · 4 answers · asked by Anonymous in Weather

the energy of the products is lower than that of the reactants
the energy of the transition state is higher than that of the reactants
both (a) and (b) are true
both (a) and (b) are false

2007-07-17 06:44:22 · 1 answers · asked by Anonymous in Chemistry

I want to do some course related to astrophysics,Ufology or about space.Please give me the details.

2007-07-17 06:42:29 · 2 answers · asked by ramyavarmar v 1 in Astronomy & Space

why is it so that in refr. through glass slab the ray bends as soon as it enters glass and again when it goes out but in lens it bends only at optical centre?

2007-07-17 06:39:48 · 5 answers · asked by Anonymous in Physics

During designs for chilled water systems for normal pressures (150 PSI) when do we use black steel pipes and when do we use ABS pipes what I know is that ABS is more preferable to use for burried pipe networks, but I got to know that it may be used for the whole system. Also when we use ABS how do we get the friction rate to calculate the pressure drop in the system

2007-07-17 06:38:40 · 3 answers · asked by Mohammed E 1 in Engineering

Invisible man, hollow man, fantastic 4 , do you think we have the technology to make somebody invisible?

2007-07-17 06:38:37 · 11 answers · asked by shawn g 1 in Astronomy & Space

please i need some help quickly ! by the end of today .
does the air on the top of the wing go faster then the air under the wing ? or can you just tell about lift on a plane something i would understand at myage (14). as we have to show the class 2moro. :(:(:(

2007-07-17 06:38:34 · 6 answers · asked by Anonymous in Physics

Just like in the movies,( Lost in Space, Star Wars, etc...) do you think we will have a ship that can take us through the galaxy in the next 50-75 years? Or develope like a Hyper drive system?

2007-07-17 06:36:49 · 12 answers · asked by shawn g 1 in Astronomy & Space

This is a very hard question.Try to answer this from internet.Even i can't answer it.

2007-07-17 06:36:31 · 21 answers · asked by samand 1 in Astronomy & Space

what do you do afther you graduate for nuclear engineering?
how many kinda jobs will be working with nuclear
can you have a jobs when you done with school?

2007-07-17 06:35:12 · 1 answers · asked by Helper 6 in Engineering

ionic bonds are weak
no covalent bonds need to be broken for reaction to occur
reactions between ions are endothermic
reactions between ions are exothermic

2007-07-17 06:33:24 · 2 answers · asked by Anonymous in Chemistry

and are there ways to make them more efficent

2007-07-17 06:28:13 · 1 answers · asked by macgyver 1 in Physics

1-An archer shoots an arrow into a piece of wood. The arrow is traveling at 120 km/h when it strikes the wood. The arrow penetrates 3.8 cm into the wood before stopping. What is its average acceleration in meters per second into the wood?
2-It takes 4.20 s for a ball that was thrown down from the top of a building to reach the sidewalk below. The balls velocity upon striking the sidewalk is 148 mi/h.
a- How tall is the building?
b- What is the initial velocity of the ball?
3-A dragster runs the quarter mile in 8.96 s.
a- What is the cars velocity at the finish line in ft/s and in mi/h?
b- What is the cars average acceleration in ft/s squared?
4- A bullet is fired vertically upward from a gun with an initial velocity of 225 m/s.
a-how high does the bullet go?
b-how long does it take to reach its maximum height?
c-how long is it in flight?

2007-07-17 06:28:05 · 3 answers · asked by Anonymous in Physics

2007-07-17 06:27:07 · 9 answers · asked by jessica f 1 in Mathematics

2007-07-17 06:25:08 · 2 answers · asked by eugenebarabasz 1 in Weather

I have lots of mild steel mig experience but no aluminum mig experience. I have a weld test at a company in a few days and wondering which direction the travel speed should go.

Any information is muchly appreciated. thanks

2007-07-17 06:24:36 · 3 answers · asked by Anonymous in Engineering

2007-07-17 06:23:39 · 4 answers · asked by srinivasan j 1 in Engineering

Whats the greatest secret do you think the government has never told the people? Have we landed on the moon? Do we know who shot JFK? Did we try and kill Castro? There are many other secrets out there in the last hundred or so years. Are there aliens? What do you think is the biggest kept Secret?

2007-07-17 06:16:40 · 16 answers · asked by coolguy3721 1 in Astronomy & Space

2007-07-17 06:14:43 · 9 answers · asked by Anonymous in Astronomy & Space

The sand on a beach is being washed away by slowly by erosion. In 1870, a lighthouse was 1500
feet from the shoreline. In 1990, the lighthouse was only 150 feet from the shoreline. If the
erosion continues at this rate, how many more years will it be before the lighthouse is at the
shoreline? Write an equation that will tell you the distance of the lighthouse from the shore at
any year, where t is the year.

2007-07-17 06:00:24 · 10 answers · asked by beauty mirna 3 in Mathematics

2007-07-17 05:56:27 · 7 answers · asked by I dont know 4 in Zoology

Q2 Colleges can purchase your name and mailing address from the Student Search Service after you
take the PSAT or SAT. (Unless you check the box to keep this information private.) Colleges pay
the Service $185 plus 28 cents for each name bought.
A. How much will a college pay for a list of 1000 names?
B. One college made an order in the amount worth over $48,000. How many names did the
college order?
C. The service had $17 million dollars in orders last year. If the orders came from 700 colleges,
how many names did all these colleges order? If there were 1.3 million students whose names
were available, what was the average number of mailings sent to each of those students?

2007-07-17 05:54:25 · 7 answers · asked by beauty mirna 3 in Mathematics

do big cities have power lines? i don't think they do... and if they don't, who not?

2007-07-17 05:53:36 · 6 answers · asked by noemy s 1 in Engineering