Science & Mathematics - 11 October 2007

i think this is how you work it out but i dont know.
2% of £12.59
2% = 0.02
0.02 x 12.50 = 0.25

2007-10-11 02:09:29 · 22 answers · asked by Nat 1 in Mathematics

2007-10-11 02:05:59 · 6 answers · asked by Anonymous in Mathematics

Do they hibernate or migrate or neither

2007-10-11 01:57:58 · 2 answers · asked by Anonymous in Zoology

2007-10-11 01:54:27 · 24 answers · asked by tracys_dream 2 in Earth Sciences & Geology

sleeping pills medicine like valium or alprax of 0.25 mg or 5mg power of medicine could be dangerous if someone take 10 tablets at a time

2007-10-11 01:51:26 · 3 answers · asked by ravi k 1 in Medicine

When 36.3 L ammonia and 40.0 L oxygen gas at STP burn, nitrogen monoxide and water are produced. After the products return to STP, how many grams of nitrogen monoxide are present?
g
NH3(g) + O2(g) NO(g) + H2O(l) [unbalanced]

2007-10-11 01:44:08 · 1 answers · asked by jnester0289 1 in Chemistry

The air in a hot-air balloon at 754 torr is heated from 13°C to 60.0°C. Assuming that the moles of air and the pressure remain constant, what is the density of the air at each temperature? (The average molar mass of air is 28.8 g/mol.)
13°C

60.0°C

2007-10-11 01:42:40 · 1 answers · asked by jnester0289 1 in Physics

2007-10-11 01:28:33 · 9 answers · asked by Anonymous in Botany

I have a question here from the book I have mentioned above

The question is - There are 4 nos between 100 and 1000, which are equal to the sum of the cubes of its digits. Three of them are 153, 371 and 407. Find the fourth no.

The answer is 370.

I still actually didn't get as to how to proceed to solve the problem. Can anyone explain the solution to me.

I found a pattern here - In each of the nos, the transition of the nos from one to the next, results in the change of only one digit

153
} 7
371
} 1
370
} 4
407

But I need a more plausible explanation as to how I can go about solving this and not use mere brute force!

2007-10-11 01:26:20 · 5 answers · asked by scw_0611 1 in Mathematics

2007-10-11 01:19:14 · 8 answers · asked by Average Joes 4 in Chemistry

7x/10 - x/10

2007-10-11 01:16:33 · 9 answers · asked by Joe T 1 in Mathematics

i am doing a science fair project on which kind of sound barrier works best and i need to figure out how i would measure the sound waves.

2007-10-11 01:13:30 · 3 answers · asked by the crazyness 2 in Physics

Do you believe that this world has many dimensions?
1) Physical and Spiritual Dimension
2) Naturalistic and Imaginary Dimension
3) Dimension of Time (1 second is 1 dimension)
4) Dimension of Size (Microscopic to universal)
5) Dimension of Physics (Quantum Physics and Newtonian Physics)
Does these dimensions abstractly exist?

2007-10-11 01:08:37 · 5 answers · asked by Kyle J 6 in Physics

What is the relevance of studying supercontinents and what are its applications?

2007-10-11 00:58:23 · 4 answers · asked by shadowzone 1 in Earth Sciences & Geology

How do disinfectants and antiseptics differ from each other? How are they used and why do we use different solutions?
Identify the 3 types of burns with examples of each. Why does the type of burn matter when trying to treat it?

2007-10-11 00:56:45 · 2 answers · asked by tnthud 1 in Medicine

I know it's to ensure the longevity of the species, but what relevance does this have to the individual? Why does it matter to one person, or mouse, or lion, that their species continues?

Is it because (and I am not well educated so please don't ridicule me) that earth depends on a careful balance, and so that if too many species die the whole of nature would eventually collapsed (and therefore the need to breed is programmed into us at a genetic level)?

Thanks.

2007-10-11 00:53:58 · 19 answers · asked by Nelson 1 in Biology

can someone plese tell me the subunits in lipids ?

2007-10-11 00:52:07 · 2 answers · asked by unknown 2 in Medicine

2x-6 5x-15
------- * --------- Does * mean divide?
21 21 Not sure how to type
this. the second 21 belongs under 5x-15

2007-10-11 00:50:52 · 5 answers · asked by Joe T 1 in Mathematics

2007-10-11 00:47:29 · 18 answers · asked by Anonymous in Earth Sciences & Geology

can anybody help

2007-10-11 00:47:24 · 9 answers · asked by Anonymous in Biology

Here's the equation I need help with:
Al + H2SO4 -->

Here's what I did:
Al (s) + H2SO4 (aq) --> Al2(SO4)3 (aq) + H2 (g)

Al + Hplus1 (g) --> Alplus3 (s) + H2 (g)

Is that correct? If not, what am I doing wrong?

2007-10-11 00:45:24 · 1 answers · asked by Average Joes 4 in Chemistry

...what inventions or discoveries could they help the people realise????

Personally I think it could be quite hard to show them new inventions. For instance, even steam power would necessitate the invention of new metal-working processes etc.

Any thoughts? Thanks.

2007-10-11 00:38:50 · 15 answers · asked by Lozzo 3 in Engineering

2007-10-11 00:31:30 · 10 answers · asked by Joe 3 in Astronomy & Space

whats 4932000 to 3,2 & 1 signifacant figures please anyone i totally forgot about this

2007-10-11 00:28:41 · 9 answers · asked by BestSense 3 in Mathematics

How many convenient ways can the number "98" be factored? I have a really hard time trying to find a quick and easy way to factor uncommon numbers.

2007-10-11 00:13:33 · 4 answers · asked by dana c 1 in Mathematics

2007-10-11 00:12:45 · 2 answers · asked by star 2 in Physics

this is the situation: a body of mass starts down from the top of an inclined plane 20 ft long and 10 ft high. what is its velocity at a point 12 ft from the top if the coefficient of friction is 0.1?

sorry for the pressure. thanks a lot. it will be really a big help.

2007-10-11 00:11:45 · 3 answers · asked by glacylyn e 1 in Physics

2007-10-11 00:11:10 · 17 answers · asked by Vivi 5 in Astronomy & Space

If the standard free energy change for combustion of 1 mole of a gaseous fuel is -856 kJ/mol and the number of electrons involved in the reaction is 8 mol, calculate the standard voltage that could be obtained from a fuel cell using this fuel.
Answer to 3 decimal places. Use F = 96485 C mol-1

2007-10-11 00:10:48 · 2 answers · asked by Anonymous in Chemistry

The Height is 9cm and the diameter of the circle is 9cm i think the circumference is 28.3 (1dp)
Also please could you state how you did it
Thanks

2007-10-11 00:06:50 · 5 answers · asked by Dan W 2 in Mathematics