Science & Mathematics - 18 December 2007

2007-12-18 05:28:24 · 8 answers · asked by Anonymous in Physics

6x2y4
8x2y4
8xy4
6xy4

2007-12-18 05:26:48 · 10 answers · asked by Anonymous in Mathematics

√6 / √11 + 2

2007-12-18 05:25:31 · 4 answers · asked by . 1 in Mathematics

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2007-12-18 05:24:25 · 10 answers · asked by animallover 2 in Paranormal Phenomena

a box of books weighing 325 N moves at a constant velocity across the floor when the box is pushed with a force of 425 N exerted downward at an angle of 35.2 degrees below the horizontal. Find ,uk between the box and the floor...?

2007-12-18 05:22:30 · 2 answers · asked by Anonymous in Physics

a box of books weighing 325 N moves at a constant velocity across the floor when the box is pushed with a force of 425 N exerted downward at an angle of 35.2 degrees below the horizontal. Find ,uk between the box and the floor...?

2007-12-18 05:18:50 · 2 answers · asked by Anonymous in Physics

I had a go at this quiz but some of the questions were to hard for me so if your good at maths i would appreteate it if u helped me out thanks.

these are the questions i could not get:
1. This Christmas, your brother Jack is twice as old as your sister Jen. The sum of Jack’s age and three times Jen’s age is 35. How old is Jen?4 years old

2. Dana needs 300 Christmas lights with equal amounts of each of her 4 selected colours. She already has 32 red, 26 green, 9 yellow and no blue. How many more of each colour does Dana need to buy?
If the bulbs cost 25 pence and you get 20% off if you purchase 50 or more of the same colour and 30% off if you purchase 60 or more of one colour, how much does Dana need to spend? Show your working out.

3. Parents donated fudge for the Christmas fund raiser for your classroom. 40 pounds of chocolate fudge sold for £2.15 per pound and vanilla fudge sold for £1.90 per pound. Your class made £158.20. How many pounds of fudge were sold?

4. Justin is making snowballs to build a fort in the Christmas holidays. Justin can build 15 snowballs in an hour but 2 snowballs melt every 15 minutes. How long will it take him to build 210 snowballs?

5. You have 15 meters of ribbon for your Christmas gift boxes. Each box gets the same amount of ribbon. How much ribbon will each of your 20 gift boxes get?

6. You finally have your Christmas shopping money! You put £2.00 away in January, £4.00 away in February, £8.00 away in March, £16.00 away in April and followed this savings pattern through to December. How much money do you have to shop with?

2007-12-18 05:15:01 · 7 answers · asked by night rider 2 in Mathematics

have UV lights that I would like to put in a tube and block it's harmful UV rays. I plan to use a polycarbonate tube, but I'm getting conflicting answers on wikipedia if it 100% blocks harmful UV.

http://en.wikipedia.org/wiki/polyca...
Above link it says polycarb resists UV fairly. (right and colum in yellow)
On the same page bellow the graph it says: 0% transmission at almost exactly 400 nm, blocking all UV light transmission."

Then here:
http://en.wikipedia.org/wiki/uv_lig...

It says under "Eye" paragraph. "Some plastic lens materials, such as polycarbonate, inherently block most UV."

What's the straight story on this?

2007-12-18 05:11:26 · 9 answers · asked by honeyroastedeggroll 1 in Physics

i work in a press. it is loud and communication is crucial.

im looking the longest talk time and i also would like to know if it will work in a lot of noise in the background.

...and what are the construction workers using?

2007-12-18 05:10:56 · 1 answers · asked by francisromero79 2 in Engineering

I have UV lights that I would like to put in a tube and block it's harmful UV rays. I plan to use a polycarbonate tube, but I'm getting conflicting answers on wikipedia if it 100% blocks harmful UV.

http://en.wikipedia.org/wiki/Polycarbonate
Above link it says polycarb resists UV fairly. (right and colum in yellow)
On the same page bellow the graph it says: 0% transmission at almost exactly 400 nm, blocking all UV light transmission."

Then here:
http://en.wikipedia.org/wiki/UV_light

It says under "Eye" paragraph. "Some plastic lens materials, such as polycarbonate, inherently block most UV."

What's the straight story on this?

2007-12-18 05:10:40 · 2 answers · asked by honeyroastedeggroll 1 in Chemistry

Solve by completing the square x2 - 6x - 4 = 0.
-3 +
3 +
-3 + 2
3 + 2

2007-12-18 05:09:42 · 8 answers · asked by Anonymous in Mathematics

2007-12-18 05:09:29 · 6 answers · asked by Anonymous in Mathematics

You are blindfolded before a table. On the table are a very large number of pennies. You are told that 2007 of the pennies are heads up and the rest are tails up. How can you divide the entire set of pennies into two subgroups, each with the same number of heads facing up?

2007-12-18 05:08:39 · 2 answers · asked by BadCompany 1 in Mathematics

i need this as soon as possible. it is for a school project. i need this in the next 30 minutes. thanks in advance.

2007-12-18 05:07:21 · 0 answers · asked by ♥myflykicks10♥ 3 in Other - Science

Friendzzz.1)Why is it important 2 balance an equation?????
2)How do v balance an equation???Plzzz help wth the examples.
Any help would be appreciated!

2007-12-18 05:04:51 · 2 answers · asked by Anonymous in Chemistry

Math question! Dan wants to paint the walls and ceiling in a room that is 14 feet x 16 ft. with an 8 ft. high ceiling. He will not paint the double doors, which has a measurement of 6ft x 7ft. One gallon of paint will cover 350 square feet. How many gallon of paint will Dan need to buy?

2007-12-18 05:00:33 · 7 answers · asked by Init05 2 in Mathematics

2007-12-18 05:00:17 · 3 answers · asked by Anonymous in Earth Sciences & Geology

228x12
-----------
24
what does the line mean eg x + -

2007-12-18 04:54:20 · 6 answers · asked by bumberclarte 1 in Mathematics

How would you express this in simplest form:
(a/6 - a) + (6/a - 6)

Is it 1 or -1?
Or is it (a + 6/6 - a) or (a + 6/a - 6)?

2007-12-18 04:50:59 · 5 answers · asked by Anonymous in Mathematics

What's the difference between a vein and a venule?

2007-12-18 04:49:18 · 4 answers · asked by english 2 in Biology

i need help to prove teacher that he wrong

2007-12-18 04:47:06 · 2 answers · asked by Samo 2 in Geography

what are the steps for this.

2007-12-18 04:46:11 · 6 answers · asked by Raquel - 3 in Mathematics

Find (k³ - 3k - 2) ÷ (k - 2)

It is multiple choice, is it:
k^2 + 2k + 1
k + 2
k^2 + 2k + 1 - (4/k - 2)
or
k^2 - 2k - 7 - (16/k - 2)

2007-12-18 04:44:22 · 8 answers · asked by Anonymous in Mathematics

2007-12-18 04:44:10 · 12 answers · asked by crystal d 2 in Paranormal Phenomena

The leaves are longer and broad...a spade shape. Usually the plant produces these very cool flowers that are pink that have a cream-colored protrusion. As of recently, the flowers have stopped emerging. I'm just looking for the plant name, so I can read up on how to care for it. Thanks for the help!

2007-12-18 04:38:43 · 3 answers · asked by Patronin' 2 in Botany

One more quition when the world goes around , are we upside down where gravity holds us down.

2007-12-18 04:34:09 · 8 answers · asked by Anonymous in Physics

A.

hypertonic

B.

isotonic

C.

hypotonic

D.

eqilibrium

2007-12-18 04:29:46 · 4 answers · asked by angelprincessprincessmela 1 in Biology

2007-12-18 04:25:25 · 13 answers · asked by Blake P 1 in Engineering

A.

osmotic pressure.

B.

osmosis.

C.

facilitated diffusion.

D.

active transport

2007-12-18 04:25:12 · 0 answers · asked by angelprincessprincessmela 1 in Biology

2007-12-18 04:24:51 · 4 answers · asked by Anonymous in Zoology