Science & Mathematics - 17 December 2007

Is a neuron cell unicellular or multicellular?

If its unicelleular:

where does it live?

how does it get energy?

how is this cell unique or different from genetic plant or animal cells?

If it is multicellular:

What role does it play?

where is it located in the body?

how is this cell unique or different from genetic plant or animal cells?

what cell organelles and/or cell parts does the cell have?

what shape is the cell?

PLEASE HELP ME!!

2007-12-17 12:39:21 · 4 answers · asked by Anonymous in Biology

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please help w/ physics work?

A child and sled with a combined mass of 48.6 kg slide down a frictionless hill that is 8.02 m high. If the sled starts from rest, what is its speed at the bottom of the hill?

and

A person doing a chin-up weighs 755 N, disregarding the weight of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 381 N on the torso. If the upward movement starts from rest, what is the person's speed at this point?

2007-12-17 12:39:14 · 1 answers · asked by Anonymous in Physics

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99942 Apophis, so there is a chance it?

well sorry aboutthe spell in my last question thats no reason to make fun of my question anywas thanks for the replys butt i was just trying to understand what whould happen if it did hit earth wit it be mass distruction globel or reg

2007-12-17 12:37:52 · 3 answers · asked by Anonymous in Astronomy & Space

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A +5.8 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm?

At what coordinates can a third charge be placed so that it experiences no net force?

2007-12-17 12:33:40 · 2 answers · asked by Dan 1 in Physics

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What is an isotope?

i need to know this because i got a big chem test coming up and i have not payed attenion in chem =/

2007-12-17 12:33:29 · 10 answers · asked by Dave 1 in Chemistry

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The hardest math question in this world...?

A 'snooker' table (measuring 8 metres by 4m) with 4 'pockets' (measuring 0.5m and placed at diagonal slants in all 4 corners) contains 10 balls (each with a diameter of 0.25m) placed at the following coords:
2m,1m...(white ball)
...and red balls...
1m,5m... 2m,5m... 3m,5m
1m,6m... 2m,6m... 3m,6m
1m,7m... 2m,7m... 3m,7m

The white ball is then shot at a particular angle from 0 to 360 degrees (0 being north, and going clockwise).
Just to make it clear, a ball is 'potted' if at least half of the ball is in area of the 'pocket'

Assuming the balls travel indefinitely (i.e. no loss of energy via friction, air resistance or collisions), answer the following:

a: What exact angle/s should you choose to ensure that all the balls are potted the quickest?
b: What is the minimum amount of contacts the balls can make with each other before they are all knocked in?
c: Same as b, except that each ball - just before it is knocked in - must not have hit the white ball on its previous contact (must be

2007-12-17 12:31:53 · 1 answers · asked by Randy Moss 2 in Mathematics

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a five digit number is chosen at random..?

from a table of all five-digit numbers. What is the probablity that the number is evenly divisible by 1, 2, 3, 4, and 5?

2007-12-17 12:29:58 · 9 answers · asked by Anonymous in Mathematics

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Find the shortest distance?!?!?

between this curve and the origin:

z^2=xy-1

2007-12-17 12:29:25 · 3 answers · asked by Randy Moss 2 in Mathematics

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Some easy impulse/momentum questions?

1. 105 kg running back runs out of bounds at 8 m/s and collides with a 50 kg cheerleader at rest. If the final velocity of the running back is 5 m/s, what is the magnitude of the resulting velocity of the cheerleader after the collision?

2. A rollercoaster car is coasting at 7 m/s when it collides with 4 rollercoaster cars at rest. They couple after colliding. What is the magnitude of their resulting velocity? Name whether it is going forward or backward as well.

3. Two billiard balls of equal mass are on a billiard table. One ball is set in motion so that it strikes the second ball off center. The second ball travels 53 degrees to the left with a velocity of 6 m/s while the first ball travels 37 degrees to the right with a velocity of 8 m/s. Determine the magnitude of the velocity of the first ball prior to the collision.

The reason I don't know how to do these is because I don't know the equation!!! Thanks!

2007-12-17 12:26:18 · 1 answers · asked by rob f 1 in Physics

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are some of the other areas in which osmosis and diffusion have played important roles in society?

What are some of the other areas in which osmosis and diffusion have played important roles in society? Thanks for your help!

2007-12-17 12:23:32 · 1 answers · asked by Caleb Seeger 1 in Botany

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i need a made up name of an animal that would live in the desert?

THANKS!!!

2007-12-17 12:22:45 · 7 answers · asked by ABC 2 in Zoology

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when will the world end?

2007-12-17 12:21:31 · 14 answers · asked by Enrico F 1 in Astronomy & Space

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A ball of mass 522 g starts at rest and slides down a frictionless track?

It leaves the track horizontally, striking the ground a distance x = 0.95 m from the end of the track after falling a vertical distance h2 = 1.03 m from the end of the track.
(a) At what height above the ground does the ball start to move?
(b) What is the speed of the ball when it leaves the track?
(c) What is the speed of the ball when it hits the ground?

2007-12-17 12:14:47 · 1 answers · asked by P 1 in Physics

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Can someone please help me? My daughter needs help with her homework and I dont remember how to do percentages

Jordan,Casey, and Michelle are having lunch. Their bill comes to $38.05. Jordan's meal is 43% of the bill,Casey's is 27% and Michelle is 30%. How much does each person owe

Mr and Ms Key went out to dinner. Their bill was 48.93 they want to leave a 20% tip. How much do they leave?

Ann bought a pair of jeans that costs 27.99,a sweater that costs 32.99, and a belt that cost 11.99. The store is having a 15% off sale. How much did Ann pay?

Tim wants to buy a necklace for his mother. The ring costs 74.99, but its on sale for 10% off. David has $69.00. Does he have enough money for the necklace?

Texas has a 6.25% sales tax. What is the total costs for a computer purchased in Texas for $599.00?

If someone can help me explain this to my daughter it would really help me out. Also if you know of any websites that would help her that would be good also. I know how to do some of these with a calculator,but thats not helping her if I cant explain how I got to that number. Thanks

2007-12-17 12:14:18 · 15 answers · asked by Anonymous in Mathematics

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A 1.50 x 10^3 kg car accelerates uniformly from rest to 10 m/s in 3 seconds.?

What is the work done on the car in this time interval?
AND
What is the power delivered by the engine in this time interval?
Can You also show me HOW you got the answer??
Thanks in advance!!!

2007-12-17 12:13:04 · 1 answers · asked by Anonymous in Physics

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Help me find the fallacies of evolution, help me disprove it, it's for my biology class.?

It's for a Creationism VS Evolution debate.

I'm on Creationism's side. Fortunately for me, the evolution team didn't do its homework and we're in the lead. (For now, anyway.) I need some evidence that disproves evolution so that I can answer and fully rebutt their points in the debate.

2007-12-17 12:11:39 · 12 answers · asked by M313R 1 in Biology

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Find the inverse function of f(x) = 3 - 2x.?

Find the inverse function of f(x) = 3 - 2x.

2007-12-17 12:10:33 · 2 answers · asked by Boo M 1 in Mathematics

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Alessandro Volta?

I need some information about Alessandro Volta and how he discovered Methane gas. Nothing else, just the methane gas. and maybe some links to pictures

2007-12-17 12:08:59 · 2 answers · asked by Anonymous in Physics

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Algebra 2/ Trig HELP!?

how do u facter the trinomial 16Xsquared - 24X+ 9 ???
I have been trying but i can't seem to get an answer that works! Please help! thanks.
heart you all ((*Ginger*))

2007-12-17 12:08:09 · 3 answers · asked by Anonymous in Mathematics

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