Science & Mathematics - 24 September 2007

0 ⤊

help me emergency!?

i really need help me for my homework in maths please help!
1)divide £1000 in the ratio 4:3:2:1
3)consider a cube of side 2 and a cube of side 3. what is the ratio of their volumes?
4)what is the ratio of ponds to pence in my pocket?
5)divide £750 in the ratio 1:5:1?
8)a stereo worth £460 is reduced by £82.80. what is the reduction as a percentage?
9)what is the percentage increase that takes £590 to £752.25?
10)if i invest £500 in a bank account that pays 4.5% compound interst per annum, then how much will that initial amount be worth in 10 years?

please help if you can even if it is just a few questions, write the number so i no which it is?
thanx!!!!!!

2007-09-24 08:31:32 · 7 answers · asked by one hot bitch!! 1 in Mathematics

5 ⤊

most common element?

I need to know the most common element on earth, including water. I believe it's hydrogen, but can someone tell me what it is, and give me a link that proves it? first to do so gets best answer

2007-09-24 08:29:31 · 10 answers · asked by Anonymous in Chemistry

0 ⤊

a photocell cathode is made of a metal with a work function of 2.8eV?

a) light of a wavelength 400nm shines on the cathode. Will photoelectrons be emitted?

2007-09-24 08:28:16 · 1 answers · asked by nothingspecial 1 in Physics

1 ⤊

With what initial speed must Bruce throw the bagels so Henrietta can catch them jus before they hit the ground

Henrietta is going off to her physics class, jugging down the sidewalk at a speed of 2.95 m/s. Her husbane Bruce suddenly realized that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apt, which is a ht of 45.1 m above the st level and directly above the sidewalk, to throw them to her. Bruce throws them horizontally at a time 4 a after Henrietta has passed below the window, and she catches them on the run. Ignore air resistance.

2007-09-24 08:28:12 · 1 answers · asked by dymestatus 1 in Physics

0 ⤊

Math help?

Please tell me the answers to these questions. I just don't understand them :(

What does it mean to "solve" a system of linear equation?

How can you use graphs to estimate the solution for a system of linear equations?

Explain how to use the susbstitution method to solve a system of linear equations.

In what cases would graphing probably be more convinient that substitution? When would substitution be more convinient than graphing?

Once you're solved a system of equations, how can you check your solution?

2007-09-24 08:23:27 · 2 answers · asked by Anonymous in Mathematics

0 ⤊

Calculating delta G?

Ok, I don't know were to start. Help please!!!

DG° = -210.155 kJ for the reaction 1A + 2B ==> 1C + 2D. What is DG (in kJ) for this reaction for the concentrations listed below? Assume 25.00°C.

Concentrations (mol/L)given:

A is 4.447
B is 2.281
C is 2.581
D is 4.196

Please Help Me!!!!!!!!!

2007-09-24 08:23:00 · 3 answers · asked by Nickname 1 in Chemistry

0 ⤊

what does altitude mean in geometry?

2007-09-24 08:21:51 · 5 answers · asked by steven L 1 in Mathematics

0 ⤊

A daring 510 N swimmer dives off a cliff with a running horizontal leap.?

What must her mim speed be just as she leaves the top of the cliff so that she will miss a 1.75 m wide and 9 m ledge below the top of the cliff ?

2007-09-24 08:21:27 · 1 answers · asked by dymestatus 1 in Physics

0 ⤊

The Earth spins on its axis once every every 24 hours or 8.64 x 104 s?

The speed of a person standing at the equator relative to a person standing at the North Pole is
(a) 0 m/s (b) 385 m/s (c) 464 m/s (d) 928 m/s (e) 1253 m/s
(Note that 1 m/s = 2.2 miles per hour)

2007-09-24 08:20:43 · 2 answers · asked by DIIV 3 in Physics

0 ⤊

Chemistry Problem?

Give the name and formula of the acids corresponding to each of the following oxoanions
1. hyponitrite ion, N2O22-
2. sulfate ion, SO42-
3. arsenate ion, AsO43-
4. dichromate ion, Cr2O72-

2007-09-24 08:19:39 · 2 answers · asked by brettmhannan 1 in Chemistry

1 ⤊

would juggling be easier to practise if you were travelling downwards in a lift?

me and my sister bought some juggling balls at a market and decided to try them out at home. it`s very difficult to do. after some thought, i was wondering if they would travel slower and make it easier to juggle them whilst going downwards in a lift. (not that we have access to a lift but just wondering) if only i could slow down gravity a bit until we improve.

2007-09-24 08:18:54 · 5 answers · asked by Anonymous in Other - Science

0 ⤊

Can a snake bite while its head is underwater?

2007-09-24 08:18:48 · 12 answers · asked by Morosss 1 in Zoology

0 ⤊

Physical Science Help?

Pure substances are either "blank" or "blank"?

The substances in a "BLANK" mixture are evenly distributed throughout the mixture?

A material used for electrical wiring would need to have good?

2007-09-24 08:16:52 · 1 answers · asked by Anonymous in Physics

0 ⤊

What is the end point of the transition reaction during glycolysis?

2007-09-24 08:14:01 · 2 answers · asked by Terri L 2 in Biology

1 ⤊

What would be concerning to us about a compound that behaves very similarly to phosphate ions?

2007-09-24 08:13:08 · 2 answers · asked by tessy5343 1 in Chemistry

4 ⤊

What's the REAL reason behind Daylight savings time?

2007-09-24 08:08:38 · 9 answers · asked by Landshark 1 in Astronomy & Space

2 ⤊

find all possible solutions to the equation x^2 + [3]x + [2] = [0] in Z47?

Here's another question too

Find all possible solutions to the equation x^2 + [3]x + [2] = [0] in Z49

2007-09-24 08:06:31 · 3 answers · asked by Rachel V 1 in Mathematics

5 ⤊

linear equations?

Please help me....i get my homework through the PC and it never told me how to write linear equations.....and now all of a sudden it wants me to answer these questions:

What is the slope of a line parallel to the line whose equation is y - x = 5?

a)-1
b)1/5
c)1
d)5

What is the equation of a line that passes through points (-1, 2) and (5, 2)?

and i dont understand how to even do those

2007-09-24 08:03:48 · 6 answers · asked by The Eternal Warrior? 4 in Mathematics

2 ⤊