Science & Mathematics - 26 November 2007

can someone explain to me how to do these

19-20
consider a 627 N weight held by two cables. the left-handed cable had tension T2 and makes an angle of 48degrees with the ceiling . the right and cable had tension T1 and makes an angle of 35degrees with the ceiling
what is the tension in each cable

10 11
gravity on the surface of the moon is only 1/6 as strong as gravity on earth
the acceleration of gravity is 10m/s^2
what is the weight of a 14kg object on earth (answer in newtons)
weight on moon?

*i thought it would just be 14 times 9.8 for the weight on eearth but i enterd both 137.2 and 137.3 and the computer said it was the wrong answer?

thansk for ur help:)

2007-11-26 11:18:20 · 3 answers · asked by a.h. 2 in Mathematics

There is no way to show optical isomerism using basic structural formula models is there? I mean the most basic structural formulas that do not show the four groups in their actual positions in space.

2007-11-26 11:14:54 · 1 answers · asked by bill b 1 in Chemistry

Evaluate (int 4/1) {x * sqrtx (x-1) dx}


If anyone can help with this question that's great...
I'm using the (int) f(x) dx = F(4) - F(1).

2007-11-26 11:13:42 · 2 answers · asked by KERRY K 1 in Mathematics

A 6.0 g coin sliding to the right at 20.0 cm/s makes an elastic head-on collison with a 12.4 g coin that is initially at rest. After the collision, the 6.0 g coin moves to the left at 11.0 cm/s.
(a) Find the final velocity of the other coin.
(b) Find the amount of kinetic energy transferred to the 12.4 g coin.

2007-11-26 11:13:30 · 1 answers · asked by Anonymous in Physics

2007-11-26 11:12:59 · 10 answers · asked by Anonymous in Chemistry

I want to control the amount of volts i am using for my science fair...for example if I want a constant 45 volts how would I do that? is there A device I can conect to like 6 9volt batteries that would allow a constant output of 45 volts? please include the names of any devices and the websites where they can be found....thx

2007-11-26 11:12:56 · 9 answers · asked by Anonymous in Engineering

What is absolute zero exactly, and is it impossible to reach? If one were to magnify this temperature to a massive scale, and you, in part, stop time?

2007-11-26 11:11:51 · 5 answers · asked by Lobo man 2 in Physics

A 11.8 g bullet is fired horizontally into a 94 g wooden block initially at rest on a horizontal surface. After impact, the block slides 7.5 m before coming to rest. If the coefficient of kinetic friction between block and surface is 0.650, what was the speed of the bullet immediately before impact?

i got 1.1 as an answer but that is not right.
i don't know how to do this so any help is appreciated.thanks.

2007-11-26 11:11:17 · 1 answers · asked by loveall 3 in Physics

2007-11-26 11:10:13 · 4 answers · asked by Anonymous in Weather

Can someone explain how to write squares as a trinomial like:

(7u-3)squared

and...

How to decide whether each trinomial is a perfect square.
(If it is, factor it):

64usquared + 72uv + 81vsquared

CAN SOMEONE PLEASE EXPLAIN AS SIMPLE AS POSSIBLE!

Thanks!

2007-11-26 11:08:15 · 2 answers · asked by wavves 4 in Mathematics

2007-11-26 11:07:49 · 26 answers · asked by Anonymous in Paranormal Phenomena

2007-11-26 11:07:04 · 1 answers · asked by ISABEL G 1 in Botany

Janet jumps off a high-diving platform with a horizontal velocity of 2.8 m/s and lands in the water 2.6 s later.

How high is the platform and how far from the base of the platform does she land?

2007-11-26 11:05:46 · 1 answers · asked by bebostep 2 in Physics

2007-11-26 11:04:22 · 13 answers · asked by Anonymous in Paranormal Phenomena

Can anybody do this? http://uk.geocities.com/stweedle_uk/help.txt
And explain the working out so i can help him with the rest.

Thanks in advance

2007-11-26 11:03:28 · 16 answers · asked by stweedle_uk 4 in Mathematics

My wife noticed awhile back that most maps now a days dont show the North Pole but they show the South Pole......does anyone know why? i know it might be an ignorant question but I guess that is why I am asking.......Look it up on Google maps and you will see what I mean.......just want to show my kids where Santa lives too

2007-11-26 11:01:32 · 3 answers · asked by Chevy 2 in Earth Sciences & Geology

Write the equation of an ellipse with foci at (-4, 0) and (-4, -6) and major axis of 10

2007-11-26 11:01:15 · 1 answers · asked by confusedkid 3 in Mathematics

Who can help me answer this>?

2007-11-26 11:01:01 · 1 answers · asked by Jellybelly 1 in Mathematics

no, not ''why is the sky blue''....i wanna know why the sky is

2007-11-26 11:00:23 · 4 answers · asked by Anonymous in Weather

2007-11-26 11:00:21 · 1 answers · asked by Anonymous in Astronomy & Space

why are plants green

2007-11-26 10:59:27 · 14 answers · asked by babygirl56baby 1 in Botany

James school has 1000 students and 1000 lockers. The first student opens every locker. The second closes every second locker. The third studentreverses ( closes if opened, opens if closed )every third locker. The forth students reversesevery fourth locker... this continues until every student has opened or closed at least one locker. Which lockers are left open after all of this the process? PLEASE EXPLAIN AND I AM IN 7th GRADE THANK YOU VERY MUCH :)

2007-11-26 10:59:11 · 2 answers · asked by Q-Pac 1 in Mathematics

2007-11-26 10:58:28 · 0 answers · asked by t_rayssweetheart 1 in Botany

2007-11-26 10:55:58 · 22 answers · asked by Anonymous in Mathematics

2007-11-26 10:55:56 · 32 answers · asked by sharon 2 in Zoology

I cant find any recent article, but according to old ones it looks like we should have already reached the actual waters of the lake and therefore maybe we have interesting findings already?

2007-11-26 10:55:16 · 3 answers · asked by Joey W 1 in Earth Sciences & Geology

Do you think it is possible that someone might discover (a) a new element with atomic number 122; (b) a new element that would fit between magnesium and aluminum in the periodic table? Explain.

2007-11-26 10:54:58 · 5 answers · asked by Anonymous in Chemistry

For any triangle ABC, show that

sin(A - B)/sin(A + B) = (a² - b²)/c²

2007-11-26 10:53:29 · 3 answers · asked by Northstar 7 in Mathematics

math of course....wat r those 2 fractions simplified down as?

2007-11-26 10:51:49 · 8 answers · asked by Anonymous in Mathematics

in the morning. and you had the whole long day ahead of you, which you needed to participate in. (which means sleep isn't an option) but really, what would happen to you??

2007-11-26 10:50:21 · 8 answers · asked by Jukebox Hero 3 in Medicine