Science & Mathematics - 28 October 2007

A rotational axis is directed perpendicular to the plane of a square and is located as shown in the drawing. Two forces, 1 and 2, are applied to diagonally opposite corners, and act along the sides of the square, first as shown in part a and then as shown in part b of the drawing. In each case the net torque produced by the forces is zero. The square is one meter on a side, and the magnitude of 2 is 3 times that of 1. Find the distances a and b that locate the axis. Note that a and b are not drawn to scale.

I'm not sure where to begin with this question. Can someone give me some tips? I'd greatly appreciate it.

Thanks.

2007-10-28 07:59:02 · 1 answers · asked by Anonymous in Physics

2007-10-28 07:58:58 · 1 answers · asked by Anonymous in Mathematics

2007-10-28 07:58:35 · 6 answers · asked by me87 3 in Medicine

2007-10-28 07:57:04 · 5 answers · asked by wuerthit 2 in Geography

2007-10-28 07:56:10 · 15 answers · asked by Ramkumar R 1 in Earth Sciences & Geology

okay, im having a lot of trouble figuring out the answer to these two questions. ive looked thru my book a number of times and can never find the exact help i need.

first question.
liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, release oxygen gas on decomposition:
2H202(l) ----> 2h20(l)+o2(g) = -196.1kj

how much heat is released when 647 kg of h202 decomposes?

and the next question is
silver chloride agcl precipitates when solutions of silver nitrate, AgNO3, and sodium chlloride NaCl are mixed.

to determine the molar heat of reaction for this precipitation, 100.0ml of 0.400 M silver nitrate and 50.0mL of .800M sodium chloride were mixed in a constant-pressure calorimeter, which has a negligible heat capacity. the temp of the mixture rose from 21.15*C to 25.55*C. if the density of the solution is 1.0g/ml and its specific heat is 4.18j/g*c, what is the molar heat of reaction for this precipitation.

thanks. please show how to do them, soo ic an learn.

2007-10-28 07:55:04 · 1 answers · asked by ilikegcalot 1 in Chemistry

A centrifuge in a medical laboratory rotates at an angular speed fo 3,600 rev/min. When switched off, it rotates throught 50.0 revolutions before coming to rest. Find the constant angularr acceleratioin of the centrifuge?

COULD SOMEONE PLEASE HELP ME ON THIS PROBLEM. I TRIED WORKING IT OUT, BUT MY ANSWER IS DIFFERENT FROM THE BOOK. PLEASE SHOW ME THE RIGHT WAY AND THE ANSWER. THANK YOU

2007-10-28 07:54:34 · 2 answers · asked by markeesha h 1 in Physics

I've heard that it's when the world ends? Could anybody give me a website or explanation on this?

2007-10-28 07:54:02 · 45 answers · asked by Anonymous in Astronomy & Space

yknw .. telekinesis/ pyrokineses...and stuff

2007-10-28 07:53:00 · 3 answers · asked by Anonymous in Parapsychology

How can water be softened and what are the health concerns regarding chemically softened water?

2007-10-28 07:52:24 · 3 answers · asked by Anonymous in Chemistry

2007-10-28 07:51:24 · 15 answers · asked by gary 2 in Weather

Large objects also have wave properties in addition to particulate properties, but the wave length in large objects are so small that we cannot detect it.

1. How do we detect wavelength? Do we detect them through sight, touch etc?
2. Why can't we detect small wavelength?

2007-10-28 07:50:15 · 1 answers · asked by ashlee052690 1 in Physics

I need this for my science Project heh. I'd appreciate the help thanks

2007-10-28 07:49:44 · 2 answers · asked by sk8terpimpo33 1 in Chemistry

What is y and plese show work

2007-10-28 07:48:47 · 8 answers · asked by subzero123kid 2 in Mathematics

huh? how does the cell live without DNA? i don't get it

2007-10-28 07:46:16 · 4 answers · asked by Anonymous in Biology

Please provide some resources stating dangerous gold compounds.

2007-10-28 07:43:09 · 3 answers · asked by Chinki C 1 in Chemistry

(m+3)(-6)=m(-6)+3(-6)
=-6m+18

describe and correct the error in the soultion

2007-10-28 07:41:56 · 5 answers · asked by Anonymous in Mathematics

solve
14= x(x-5)
and
x((5+12x)=28

If you could please tell me the process of how to get the answer I would be very grateful. Thanks in advance.

2007-10-28 07:35:20 · 3 answers · asked by The Chief 2 in Mathematics

A 1400 kg blue convertible is traveling south, and a 2080kg red SUV is traveling west. The total momentum of the system consisting of the two cars is 8500 kg.m/s directed at an angle 63.0 west of south.

2007-10-28 07:32:00 · 3 answers · asked by Natiphy2007 1 in Physics

I had invented this machine and it works! Iam looking for funding and or grants to get this patent and trademarked thru out US and other countries. This is to go on every factory roof top or maybe inside factories, and on every high rise, and one big enough for the space shuttle. No Time for games, scams, or fraudulate offers. this is the real thing need help! This can save lives of animals,human lives, maybe your child other family member that is breathing bad fumes/carbon dioxide, save them from cancer,liver disease,or other life threatening heath issue. How concered are you? Can you help me make this happened? Can this be the answer to global warming? I believe it is. My invention works with 2 filtration fiters in it. It is an all green product. This production can fill many job positions all over the US. Many Steel Mill throughout the US are being fined Indiana, Minnesota need help the polution in the air is a serious heath matter. I think this is a step in the right direction.

2007-10-28 07:30:38 · 4 answers · asked by ellis7822@sbcglobal.net 1 in Engineering

something really interesting.....

2007-10-28 07:30:09 · 6 answers · asked by eru_desu94 2 in Other - Science

what are the differences between the squeleton of a reptile and an amphibian?

2007-10-28 07:28:46 · 4 answers · asked by kpadr 2 in Zoology

The question is self-explanatory...

2007-10-28 07:28:21 · 4 answers · asked by LiVE.L0VE.LAUGH :]♥ 1 in Biology

In each round of a certain game for two people, the winner scores w points and the loser scores l points (w>l>0), ties are not possible, and all scores are integers. After several rounds, Bonnie leads Connie by a score of 30 to 25. If Connie has one exactly two rounds, compute w.

Easiest-to-understand answer gets the 10.

2007-10-28 07:27:41 · 2 answers · asked by Sunrayye 5 in Mathematics

Adipic acid is used in the manufacture of nylon. The composition of the acid is 49.3% C, 6.9% H, 43.8% O (by mass) and the molecular weight is 146 amu. What is the molecular formula?

Please please help me with this. Thanks in advance!

2007-10-28 07:27:29 · 4 answers · asked by jamet002 2 in Chemistry

Has anybody ever seen or experienced a ghost ????

2007-10-28 07:24:46 · 13 answers · asked by Salza 2 in Paranormal Phenomena

what numbers are divisible by 3?

2007-10-28 07:22:49 · 7 answers · asked by Anonymous in Mathematics

can you help me confirm my answer

2007-10-28 07:21:12 · 2 answers · asked by abhin t 1 in Mathematics

I need some facts!!

2007-10-28 07:18:43 · 14 answers · asked by TrickyTiger 3 in Parapsychology

2007-10-28 07:18:36 · 9 answers · asked by J 2 in Mathematics