Science & Mathematics - 13 November 2006

An 86.0 kg climber is scaling the vertical wall of a mountain. His safety rope is made of nylon that, when stretched, behaves like a spring with a spring constant of 1.20 x 10^3 N/m. He accidentally slips and falls freely for 0.750 m before the rope runs out of slack. How much is the rope streched when it breaks his fall and momentarily brings him to rest?

My Approach:
1/2(86)(3.38 m/s) + (86)(9.8)(0) = 1/2(86)(0) + 1/2(1200)x --- i solved from the middle and the bottom

145.3 = 600x

x = .242 m

I found PE and KE at the middle and PE(elastic) and PE at bottom...the answer is wrong for sure though--it doesn't even come close to the book answer at 1.95m

2006-11-13 03:22:14 · 2 answers · asked by Anonymous in Physics

When Aluminum is heated with an element from group VI of the periodic talbe, Al forms an ionic compound. On the occasion, the group VI elmente was unknown but the compound was 35.93% Al by weight. Identify the unknown element

2006-11-13 03:21:59 · 4 answers · asked by ABC 4 in Chemistry

I was thinkig about the digging to China thing, wouldnt you have to come out feet first? BTW - I know it isnt possible, lets talk physics of the improbable.

2006-11-13 03:21:17 · 14 answers · asked by shifty67 3 in Physics

2006-11-13 03:21:05 · 10 answers · asked by Judy C 1 in Astronomy & Space

One important organelle that helps maintain homeostasis by moving supplies from one part of the cell to the other is


A)endoplasmic reticulum.

B)mitochondrion.

C)centrioles.

D)cytoplasm.

2006-11-13 03:20:13 · 10 answers · asked by Anonymous in Botany

2006-11-13 03:19:26 · 11 answers · asked by teedee_7056 1 in Biology

2006-11-13 03:18:53 · 2 answers · asked by Anonymous in Mathematics

2006-11-13 03:17:52 · 12 answers · asked by negar r 1 in Zoology

for real? yes it is true, most doctors won't tell you but flonase has steroids in it. I expirienced depression while taking it. I advise you to stop taking it if you are expiriencing any symptoms of depression or irritability. And so i don't get in trouble for not asking a question..... Do you have a food allergy?

2006-11-13 03:17:03 · 8 answers · asked by My dad ate my homework 3 in Medicine

What causes ionization to occur in the upper atmosphere?

2006-11-13 03:16:40 · 2 answers · asked by Michelles W 1 in Astronomy & Space

2006-11-13 03:15:56 · 17 answers · asked by matt_sorrentino 1 in Mathematics

when the real effects of climate change in europe and USA will be felt? Meaning conditions that people will find it very hard to lead 'normal' lives? I read an article in Time-magazine that said it will be about 50years. Same information was found both, in the EU web pages and USA goverment internet site. Is it really happening so fast and are the governments really acting and reacting this slow to stop it? Apparently it is at the point where we either act now or it will be too late. Is this true?

2006-11-13 03:15:39 · 7 answers · asked by JoJoNa 2 in Earth Sciences & Geology

We already had decided on a few importnt things for our research.We are going to use rabbits as our test animal. We are going to compare two groups using a paired t-test.
Each group is composed of 8 rabbits. Here is the flow of our procedure...acclimatize rabbits for 3 days, then get baseline cholesterol level of both groups.next, we are going to fed the 2 groups with pellets coated with lard inorder to increase their serum cholesterol level.Then get the cholesterol level(pre-test). Then for four weeks, we will treat the experimental group with geen tea while the control group for simvastatin which is a cholesterol lowering drug and then compare the result(post-test).

How are we going to compute for the sample size?

How will it differ if were are going to do these just by using 3 rabbits for each group?Or is that possible?

2006-11-13 03:15:03 · 2 answers · asked by Mike 3 in Mathematics

We already had decided on a few importnt things for our research.We are going to use rabbits as our test animal. We are going to compare two groups using a paired t-test.
Each group is composed of 8 rabbits. Here is the flow of our procedure...acclimatize rabbits for 3 days, then get baseline cholesterol level of both groups.next, we are going to fed the 2 groups with pellets coated with lard inorder to increase their serum cholesterol level.Then get the cholesterol level(pre-test). Then for four weeks, we will treat the experimental group with geen tea while the control group for simvastatin which is a cholesterol lowering drug and then compare the result(post-test).

How are we going to compute for the sample size?

How will it differ if were are going to do these just by using 3 rabbits for each group?Or is that possible?

2006-11-13 03:14:20 · 2 answers · asked by Mike 3 in Medicine

2006-11-13 03:13:43 · 4 answers · asked by kevin c 1 in Mathematics

2006-11-13 03:13:15 · 13 answers · asked by victorschool1 5 in Astronomy & Space

in construction of homes,to prevent noise polution,cardboards are used as noise preventer. but this is not done in cinema theatres.why is it so?

2006-11-13 03:12:47 · 5 answers · asked by Anonymous in Physics

I know they would never meet in the wild. I wish someone would bring them together for a fight. It would be so much better than UFC.

2006-11-13 03:12:03 · 10 answers · asked by Anonymous in Zoology

No, it's not a joke. I'm looking for serious answers.

2006-11-13 03:11:13 · 2 answers · asked by Anonymous in Astronomy & Space

Convert the polar equation to a rectangular equation.
r = (8secθ) / (4secθ + 1)

Simplify the rectangular equation by moving all of the terms to the left side of the equation, and combining like terms. The right side of the equation will then be 0.

??? = 0


I would like to know how to solve step-by-step to this problem. The answer to this question is:
15x^2 + 16y^2 + 16x - 64 = 0

thanks so much

2006-11-13 03:09:28 · 3 answers · asked by David N 1 in Mathematics

chlorophyll.

carotenoids.

carbon dioxide.

water.

2006-11-13 03:08:53 · 3 answers · asked by pumny456 1 in Botany

One day, a person went to horse racing area, Instead of counting the number of human and horses, he instead counted 74 heads and 196 legs. Yet he knew the number of humans and horses there. How did he do it, and how many humans and horses are there?

2006-11-13 03:08:44 · 5 answers · asked by pyromaniac652 1 in Mathematics

the cell can burst if the membrane becomes too large


materials cannot enter the cell if it is too large.

the cell may become too large to take in enough food and to remove enough wastes.

waste products cannot leave the cell if it is too small.

2006-11-13 03:08:09 · 3 answers · asked by pumny456 1 in Chemistry

2006-11-13 03:07:50 · 5 answers · asked by Varun N 1 in Astronomy & Space

they are both polar.

water is polar and oil is nonpolar.

they are both nonpolar.

water is nonpolar and oil is polar

2006-11-13 03:06:52 · 4 answers · asked by pumny456 1 in Chemistry

2006-11-13 03:02:20 · 2 answers · asked by J 1 in Chemistry

which is stronger, motrin or vicodin

2006-11-13 03:02:19 · 2 answers · asked by K&E4life 1 in Medicine

if the train travels for another 30 miles, how fast would the train have to go in order to average 30 mph over the total distance.

2006-11-13 03:00:38 · 9 answers · asked by niddlie diddle 6 in Mathematics

Take a beaker filled with water.pressure at its surface will be equal to atmos. pressure.now insert in it a bent pipe which connects it to another beaker L meter above the first one and having its surface parralel to the first one. it will too have pressure equal to atmos. pressure.but according to formula P = Heg the pressure at upper beaker should be (atmos.P)- (Leg )

2006-11-13 02:57:58 · 3 answers · asked by archit p 1 in Physics

A)potassium out of the cell.

B)sodium into the cell.

C)potassium into the cell.

D)only a potassium and sugar molecule together.

2006-11-13 02:56:01 · 2 answers · asked by captian6661 1 in Biology