Science & Mathematics - 15 October 2006

How old is the human race? Specifically how far back can we go and find the humans with equal genetics and intellectual capacities as humans today?

2006-10-15 03:11:38 · 4 answers · asked by locutus709 1 in Biology

2006-10-15 03:10:01 · 2 answers · asked by Tina 2 in Earth Sciences & Geology

A mass, m1 = 5.00 kg, resting on a frictionless horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging mass, m2 = 9.0 kg, as in Figure P4.25. Find the acceleration of each mass and the tension in the cable.

FInd acceleration of m1 and m2 and tension in Newtons

2006-10-15 03:05:58 · 3 answers · asked by paul_da_pimp90 1 in Physics

Since water is made of H2O lets ask a hypothetical question.I have an area that is devoid of any matter. I add 1000 atoms of Hydrogen and 500 atoms of Oxygen, seperately. Will I come up with water? If not why and if so what bonds the two? If I make the assumption that bonding takes place will I have 500 "droplets" of water or will I just have x random amount of droplets with other individual atoms hanging around?

2006-10-15 03:05:36 · 13 answers · asked by keegahill1960 1 in Physics

I need to know the the temperature(in celsius), density, thickness(in kilometer) for the inner core, outer core, lower mantle, outer mantle, asthenosphere, crust of the earth. Can anybody here give me a link to answer any of these questions?

2006-10-15 03:03:20 · 4 answers · asked by Lying from you 4 in Earth Sciences & Geology

I'm talking about the kind of food that the cockroach can eat...
Can it be oats and grains?
or you can suggest something...

Pls. help this is for my science project

Referrence PLS...
PLS...

2006-10-15 03:01:38 · 9 answers · asked by mockingbird 3 in Zoology

(mechanical properties,tensile strength, hardness, ductility, toughness, microstructure, internal stress)

2006-10-15 02:56:31 · 5 answers · asked by cmgal 1 in Engineering

2006-10-15 02:51:42 · 9 answers · asked by Mohammed Q 1 in Astronomy & Space

2006-10-15 02:42:06 · 11 answers · asked by Anonymous in Physics

2006-10-15 02:39:32 · 10 answers · asked by Mr. Owl 3 in Astronomy & Space

A mass, m1 = 5.00 kg, resting on a frictionless horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging mass, m2 = 9.0 kg, as in Figure P4.25. Find the acceleration of each mass and the tension in the cable.

FInd acceleration of m1 and m2 and tension in Newtons

2006-10-15 02:37:46 · 3 answers · asked by paul_da_pimp90 1 in Physics

Can anyone help? I'm REALLY rubbish at maths no matter how easy they are!!! So can anyone help me?
Here are the questions:

Q1. Kathleen spent three-eights of her income on rent and two fifths of what was left on food. What fraction of her income was left after buying her food?

Q2. A merchant buys 28 crates each containing three-quarters of a ton of waste metal. What is the total weight of this order?

Q3. Which is larger, 3\4 of 2 and 1\2 or 2\5 of 6 and 1\2?

Q4. After James spent 2\5 of his pocket money on magazines, and 1\4 of his pocket money at a football match, he had 1.75 pounds left. How much pocket money did he have in the beginning?

Now guys I'm really stuck and I need something called HELP out here! So don't look at the question and just ignore it at least answer one question! And thankyou to all who's going to help me!

2006-10-15 02:36:01 · 19 answers · asked by Anonymous in Mathematics

I need the names of the scientists por favor

2006-10-15 02:25:14 · 6 answers · asked by michaelson b 1 in Chemistry

2006-10-15 02:23:37 · 12 answers · asked by fsaeed1983 1 in Zoology

Did they actually have enough protection to survie the radiation of space

2006-10-15 02:22:02 · 20 answers · asked by flagnsnarf 2 in Astronomy & Space

A 5.1 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.4 m/s2, find the force exerted by the rope on the bucket.

2006-10-15 02:21:11 · 3 answers · asked by paul_da_pimp90 1 in Physics

Can anyone tell me how to prove that :
P(A)+P(B)-1 <= P(A intersect B)

2006-10-15 02:20:06 · 2 answers · asked by homeboy187nic 2 in Mathematics

2006-10-15 02:18:20 · 3 answers · asked by Allergic To Eggs 6 in Physics

i have to do a project for math and i need to find some things that are $25. help please? it can be clothes or books anything like that. if you couldn't tell my number is 25.
thanks!

2006-10-15 02:13:27 · 6 answers · asked by LAUREN d. 2 in Mathematics

2006-10-15 02:13:06 · 21 answers · asked by craigr959 2 in Other - Science

P(a)=1/3 P(b)=1/4 P(a n b)=1/6 whats is ? P(a U b), P(b\a), P(a\b)
P(a^c U b^c ) WHERE ^c = complement
P(b^c \a), P(b\a^c)

2006-10-15 02:11:59 · 4 answers · asked by Anonymous in Mathematics

Or have we reached as far as we are going and become a dead-end???

2006-10-15 02:04:46 · 16 answers · asked by Forlorn Hope 7 in Other - Science

Ever revolving. Imagine the fabric of time as a circle (infinite), instead of a line from one point to another. Possible? If so, does everything just repeat over and over again?

2006-10-15 02:01:10 · 3 answers · asked by Game Guy 5 in Other - Science

2006-10-15 01:54:54 · 7 answers · asked by Forlorn Hope 7 in Other - Science

guys please help me with these questions

1. what are the consequences of substituting for a blown fuse another

a) with a higher current rating
b)with a lower current rating

2. would accidental contact with a live wire in a mains-operated appliance necessarily be fatal? explain

3a) what would be the current in your body if you touched the terminals of a 12 v battery, if the contact R was 100 000 ohms?

3b) if your skin became wet, and the contact resistance dropped to only 1000 ohms, what would be the current in your body? is this current potentially dangerous? explain.

4. In a powerpoint correctly wired, the switch and fuse are in the 'active' line. if a power point is wired incorrectly with the netrual and active lines connected the wrong way . a toaster with a metal case is plugged into that power point. what is the effect of incorrect wiring

a) will the toaster still work? b) switch? c) if person turns off toaster and uses knife to remove bread. safe?xplain all

2006-10-15 01:54:44 · 2 answers · asked by justine l 1 in Physics

2006-10-15 01:53:57 · 12 answers · asked by Anonymous in Physics

2006-10-15 01:47:03 · 6 answers · asked by Sharada B 3 in Chemistry

2006-10-15 01:46:24 · 1 answers · asked by Sharada B 3 in Chemistry

2006-10-15 01:45:08 · 2 answers · asked by Sharada B 3 in Chemistry

2006-10-15 01:43:35 · 16 answers · asked by ofe 1 in Mathematics