Science & Mathematics - 20 December 2006

Embedded self-rejuvenation controllers?
Brain-embedded database interfaces?
Heated clothing?
Gliding around at high speeds on some energy field?

2006-12-20 11:00:09 · 3 answers · asked by henry j 1 in Other - Science

each individual bungee chord has an elastic constant fo 200 N/m and is 35 m long.A jumper will use a number of these to safely leap from a bridge which is 45 m above a river. (two chords double K, three triple etc) The jumper is 88 kg and we measure h=0 at the point where the chords snap taut. How many chords does she need if she wants to just touch the surface of the water?

On the back, he wrote the answer as 3 but didn't put an explanation.

I tried all of the equations but couldn't figure it out...HELP!!!

2006-12-20 10:59:39 · 1 answers · asked by Anonymous in Physics

100 meters is the max limit for bluetooth omnirange to prevent radio congestion. Wouldnt focusing it further in a certain direction make the signal 5 times as strong and thus illegal?

thanks

2006-12-20 10:57:28 · 3 answers · asked by Ilooklikemyavatar..exactly 3 in Engineering

An automobile with passengers has weight 16000 N and is moving at 114 km/h when the driver brakes, sliding to a stop. The frictional force on the wheels from the road has a magnitude of 8230 N. Find the stopping distance.

2006-12-20 10:57:22 · 2 answers · asked by hydrantman001 1 in Physics

2006-12-20 10:56:46 · 2 answers · asked by Kimmie B 4 in Astronomy & Space

I've watched the Conspiracy theory show and don't buy that it was a hoax.

2006-12-20 10:55:43 · 9 answers · asked by Anonymous in Astronomy & Space

2006-12-20 10:54:56 · 13 answers · asked by gabby 2 in Mathematics

O.k totaly retarted here. I am writing a story taking place in England about 1700. I can't find England on a world map anywhere.Lets just say I am not a genius in geography, is England in Europe? Any info helps.

2006-12-20 10:52:10 · 6 answers · asked by Anonymous in Geography

I cannot seem to verbalize this into words. Why can this property be proved true?

2006-12-20 10:51:27 · 6 answers · asked by swimmertommy 1 in Mathematics

2006-12-20 10:49:51 · 16 answers · asked by LAKAHIA D 1 in Mathematics

2006-12-20 10:49:20 · 3 answers · asked by connor w 1 in Geography

I really need help in this subject. Everyone says it is easy...but I just don't understand it. I have a few questions that I feel cover the areas where I am lost. Please explain the questions and how to find the answers. Also if you would like, please solve them.

1. A compact car and a trailer truck are both traveling at the same velocity. Did the car engine or the truck engine do more work in accelerating its wehicle?

2. A 10.0-kg test rocket is fired vertically from Cape Canaveral. Its feul gives it a kinetic energy of 1960 J by the time the rocket engine burns all of the feul. What additional height will the rocket rise?

3. Pam, wearing a rocket pack, stands on frictionless ice. She has a mass of 45 kg. The rocket supplies a constant force for 22.0 m, and Pam acquires a speed of 62.0 m/s. What is the magnitude of the force? What is Pam's final kinetic energy?

2006-12-20 10:49:14 · 1 answers · asked by Anonymous in Physics

Defeating aging, disease?
Consciousness?
Grand theories of everything?

2006-12-20 10:47:46 · 11 answers · asked by henry j 1 in Other - Science

bacteria causes food to spoil and meat to rot

2006-12-20 10:47:34 · 6 answers · asked by hello_world149842 1 in Biology

In R^4 let U= span { (1,1,0,0), (1,1,1,2) }

Find u in U such that

|| u-(1,2,3,4)|| is as small as possible.

I think that this means use Gram-Schmidt on the basis vectors and computing the projection of something on U.

2006-12-20 10:46:55 · 1 answers · asked by modulo_function 7 in Mathematics

Try to explain in general terms, without details into general or special relativity, can use some, what is the correlation between speed and high gravitational field in slowing time?

2006-12-20 10:46:08 · 3 answers · asked by Courageous Capt. Cat 3 in Other - Science

Hello, thanks for taking the time to read/help.

Here is the problem I'm having trouble with...

A barrel of honey weighs 50 pounds. The same barrel with Kerosene in it weighs 35 pounds. If honey is twice as heavy as Kerosene, what is the weight of the empty barrel?

2006-12-20 10:45:13 · 6 answers · asked by w0rfl3z123 1 in Mathematics

a. silver and fluorine e. ammonium and oxalate ions
b. nickel (II) and sulfur f. strontium and iodine
c. chromium (III) and bromine g. lithium and oxygen
d. lead (II) and phosphate

2006-12-20 10:44:27 · 2 answers · asked by San Fran Kid 2 in Chemistry

i kno you can crossbreed a lion and a tiger to make a liger and a horse and a donkey to make a mule...what else is there?

2006-12-20 10:42:17 · 9 answers · asked by popeye 1 in Zoology

science fair report.. plz help i cant find it anywhere on the web thx guys

2006-12-20 10:42:13 · 2 answers · asked by Sarah 1 in Earth Sciences & Geology

a. calcium chloride e. sodium fluoride
b. sodium cyanide f. aluminum nitrate
c. magnesium oxide g. zinc iodide
d. barium oxide h. cobalt (II) carbonate

2006-12-20 10:41:49 · 1 answers · asked by San Fran Kid 2 in Chemistry

2006-12-20 10:41:28 · 20 answers · asked by tracey sue 2 in Astronomy & Space

2006-12-20 10:39:55 · 6 answers · asked by Abbas R 1 in Astronomy & Space

What US state that's south of the Tropic of Cancer and on the same latitude as two countries devastated by the tsunami?

2006-12-20 10:38:45 · 2 answers · asked by Hardcore 3 in Geography

1) blood is pumped out of the heart via thick walled(2mm) tube known as the aorta(inside diametere about 18mm) at an average speed for adult at rest, of 0.33m/s.
a)compute the discharge rate
b)the aorta branches into about 32 majotr arteries that are each roughly the same size-namely- 4mm inside diametere. detrmine the speed of blood through these arteries.(HInt:- it is diffrent thn if there were just one!)

2) a uniform solid cube of material 10 cm on each side has a mass of 700 g.
b)if so, how much of its volume will be submerged?

2006-12-20 10:37:56 · 1 answers · asked by Kshitil 1 in Physics

U1 and U2 are subspaces of V. Assume B is a basis of U1 intersect U2. Extend B to B1, a basis of U1 and extend B to B2, a basis of U2.

Prove or disprove:

B1 union B2 is a basis of U1 + U2 ?

2006-12-20 10:37:47 · 1 answers · asked by modulo_function 7 in Mathematics

grams, meters, liters, kilo-, centi-, milli-, percent error
help!!!! ???

2006-12-20 10:36:55 · 7 answers · asked by Anonymous in Mathematics

2006-12-20 10:36:52 · 5 answers · asked by Hardcore 3 in Geography

Is the placenta entirely maternal or fetal tissue, or is it both? Serious answers only please.

2006-12-20 10:35:45 · 1 answers · asked by chattychica04 2 in Biology

Acme Company wants to open accounts at 3 different local banks. If 10 banks are available, how many ways can Acme choose the 3 banks?

2006-12-20 10:35:33 · 2 answers · asked by baseballman1243 1 in Mathematics