Science & Mathematics - 30 July 2007

2007-07-30 08:09:37 · 7 answers · asked by Anonymous in Mathematics

What's the difference between grounding and earthing? Is one term American and one British? Which?

2007-07-30 08:02:47 · 6 answers · asked by The Irish Dragon 3 in Engineering

I am not refering to the garden variety edelweiss or the American version of the edelweiss plant. I am specifically refering to the wild edelweiss that grows only in some parts of the Swiss Alps at an altitude of 2,000 to 2,900. The Genus and Species name is: Leontopodium alpinum. I would like to know if this plant has thorns on the stem. I don't think you can really answer this question unless you have actually been to the Swiss alps and have seen an actual flower. I spoke to several Swiss residents and most said they have never seen one in their lifetime. By thorns I do not necessarily mean thorns as in rose thorns. I was told by some Swiss people that you can get pricked if you try to touch them. They diddn't know the English word for "thorns" and I would just like to know more about this really famous and beautiful flower. I don't think they were refering to it being illegal to pick the flower because we discussed that separately. I believe they were refering to actual thorns.

2007-07-30 07:56:44 · 3 answers · asked by veolabelleza 1 in Botany

2007-07-30 07:55:33 · 1 answers · asked by Tim F 1 in Physics

1.) sinx= cosx on [0, 2pi]
2.) sin2x = 1/2 on [0, 2pi]
3.) sin3x= sqrt(3)/2 for all x
4.) cos4x= -1/2 for all x
5.) tan2x=0 on [pi/2, 3pi/2]

2007-07-30 07:54:32 · 4 answers · asked by b country90 1 in Mathematics

Can somebody define schrodinger's cat in a simple manner? I looked it up on Wikipedia and I didn't get a word (yeah....not that bright). Thanks!

2007-07-30 07:54:18 · 4 answers · asked by Insert nickname here 2 in Physics

is it true that the earth will come to its end around the same time the sun is about to die? because i hear that when the sun starts running out of hydrogen itll start to expand to about 100x its size and as it does itll consume the first three inner planets ? am i right ?

2007-07-30 07:49:47 · 13 answers · asked by thecrystalmethod1 1 in Astronomy & Space

2007-07-30 07:46:18 · 4 answers · asked by prashant d 1 in Astronomy & Space

What could be causing our (older) maple tree to have very few leaves? It looks dead, but the branches are still green if cut, not brittle. The leaves left over are not pretty fall colors, but ugly, brown, wilted, and shrivled.

2007-07-30 07:41:05 · 3 answers · asked by Lauren D 2 in Botany

2007-07-30 07:40:53 · 4 answers · asked by Anonymous in Chemistry

the half life of radium is 1690 years. if 10 grams are present now how much will be present in 50 years??

please help!

2007-07-30 07:40:20 · 3 answers · asked by Anonymous in Weather

When does each apply?

Thanks.

2007-07-30 07:37:20 · 2 answers · asked by SRH 1 in Engineering

I often hear proponents talk about teaching ID alongside evolution, but I have yet to see an ID textbook for students. When I ask what ID is about all I hear is people trying to poke holes in evolution, that's NOT how a scientific theory works. I've seen nothing that would represent ID as a complete, coherent theory of anything, even most of the people who are for it don't know what it is! The best I've gotten is 'ID states that the complexity of life is too great for random chance and there must have been a guiding intelligence in its creation'. That's a suggestion, not a theory. It doesn't explain anything, predict anything, and it certainly doesn't increase our understanding of anything. It's religion in a lab coat.

2007-07-30 07:23:24 · 13 answers · asked by AmigaJoe 3 in Biology

I have an AP Calculus summer assignment.

Here are the questions: (1.) y=4sin(2x)+1
(2.) y=-3tan(pie(x))
(3.) y=cos²(x)
(4.) -3sec(-6x)+2

2007-07-30 07:22:04 · 3 answers · asked by b country90 1 in Mathematics

haven't they sent the rovers over to check it out?


any thoughts on what it may have been?

2007-07-30 07:20:29 · 15 answers · asked by Anonymous in Astronomy & Space

the biggest is and f5 or 6 what would an f20 look like and how strong would it be

2007-07-30 07:20:23 · 6 answers · asked by nascar2play 2 in Weather

2007-07-30 07:20:13 · 12 answers · asked by Anonymous in Weather

2007-07-30 07:14:05 · 3 answers · asked by BELINDA B 4 in Biology

A small block of mass M is released from rest at the top of the curved frictionless ramp. The block slides down the ramp and is moving with a speed of 3.5v when it collides with a larger block of mass 1.5M at rest at the bottom of the incline. The larger block moves to the right at a speed 2v immediately after the collision. Express the answers in terms of the variables given and fundamental constants.

a) Determine the h of the ramp from which the small block was released.
b) determine the speed of the small block after the collision.
c) The larger block slides a distance D before coming to rest. Determine the value of the coefficient of kinetic friction between the block and the surface.

please show me steps an formulas, i am so confused.

2007-07-30 07:10:15 · 1 answers · asked by Anonymous in Physics

2007-07-30 07:05:00 · 5 answers · asked by Shaun L 1 in Engineering

2007-07-30 06:55:41 · 6 answers · asked by Anonymous in Geography

reagents used in the conversions
a- ethanol to but-1-yne
b- 1-bromopropane to 2-bromopropane
c- toluene to benzyl alcohol
d- benzyl alcohol to 2-phenylethanoic acid
e- ethanol to propanenitrile
f- aniline to chlorobenzene
g- 2-chlorobutane to 3,4-dimethylhexane
h- 2- methyl-1-propane to 2-chloro-2-methylpropane
i- ethyl chloride to propanoic acid
j- but-1-ene to n-butyliodide
k- 2-chloropropane to 1-propanol
l- isopropyl alcohol to iodoform
m- chlorobenzene to para-nitrophenol
n- 2-bromopropane to 1-bromopropane
o- chloroethane to butane
p- benzene to diphenyl
q-aniline to phenylisocyanide

it would be very helpful if u could solve just one.

2007-07-30 06:55:31 · 2 answers · asked by Anonymous in Chemistry

2007-07-30 06:51:18 · 5 answers · asked by Anonymous in Geography

and this one too : If cos A = -7/25 and sin B = 4/5 with A in QIII and B in QII, find ht eexact value of the following expressions.
sin A, tan B, cos(A+B), sin2B, cos A/2

2007-07-30 06:46:42 · 2 answers · asked by BobLong 1 in Mathematics

2007-07-30 06:46:20 · 14 answers · asked by Anonymous in Weather

A uniform metal rod of mass 100 kg and length L (=2.5 meters) is suspended from the side of a building as shown in the figure. On the far end a mass of 100 kg is hung by a rope, (distance L from the building). The rod is connected to the building on the left end by a pivot, (and a force F is extend on the rod by the pivot). To hold thips up a strong cable is attached a distance L/4 from the pivot (and has a tension T on it).
a)The system is in equilibrium.
Using rotational equilibrium and torque, find the tension in the cable.
b) Using net forces, calculate the force the pivot exerts on the rod.

2007-07-30 06:43:53 · 2 answers · asked by Anonymous in Physics

I have only smoked weed once a month ago then another time 8 days ago, if i took niacin the past two nights and i have a drug test tommorow, will i pass

2007-07-30 06:42:29 · 3 answers · asked by drummin696 2 in Medicine

How is that Nasa can show us pictures of space 10 billion light years away but cant seem to show us a picture of the American Flag on the moon? I assuming the flag is still there right? Like it aint gonna go any where.

2007-07-30 06:42:19 · 12 answers · asked by Tyler R 1 in Astronomy & Space

2007-07-30 06:39:01 · 16 answers · asked by Anonymous in Astronomy & Space

simplify this expression.

2007-07-30 06:37:17 · 9 answers · asked by Anonymous in Mathematics