Science & Mathematics - 3 October 2007

I'm having trouble understanding the concepts of tension in this problem. Two 1.6kg blocks are connected by a rope. A second rope hangs beneath the lower block. (The diagram is vertical - one block with another block below connected by a rope and that block with a rope beneath it). Both ropes have a mass of 250g. The entire assembly is accelerated upward at 4.0m/s^2 by force F. What is F? What is the tension at the top end of the rope connecting the two blocks? at the bottom end? What is the tension at the top end of the rope beneath the second block?

2007-10-03 11:40:23 · 2 answers · asked by gogiapeach33 2 in Physics

help please

2007-10-03 11:40:11 · 5 answers · asked by Anonymous in Mathematics

could be childrens book-ish...
some kind of theory of how the world started (dont get fancy, i need a simple explanation to build a paragraph off of)

2007-10-03 11:39:49 · 9 answers · asked by karla 2 in Astronomy & Space

why do we need to factor the numerator
and the denominator

2007-10-03 11:39:11 · 1 answers · asked by Anonymous in Mathematics

I assume it would be ok to get fired since engineers get laid off all the time for no reason, but a friend says it can destroy their professional image. What do you think?

2007-10-03 11:38:46 · 2 answers · asked by Anne 5 in Engineering

2007-10-03 11:38:21 · 7 answers · asked by Anonymous in Geography

What are two sources of carbon dioxide in the air??

2007-10-03 11:37:01 · 3 answers · asked by Ciara D 1 in Other - Science

I have a question that asks the lengths of a triangles sides. The length of the hypotenuse is 130 cm, and the area is 3m. Is there a relation between this and its side lengths? How can I figure this out? The answer is 120 x 50, but I need to know how to get to this.

2007-10-03 11:34:57 · 3 answers · asked by Marie 2 in Mathematics

what is 2 to the negative third power??

2007-10-03 11:33:47 · 6 answers · asked by Anonymous in Mathematics

2007-10-03 11:31:07 · 10 answers · asked by Anonymous in Astronomy & Space

Ie. more metallic/less magnetic from left to right? I found out that this is examinable in my year 12 exam, but there is no mention of it in my texbook.

Thanks for your help :)

2007-10-03 11:30:57 · 1 answers · asked by Anonymous in Chemistry

whats the answer to this problem? work out if possible :?

2007-10-03 11:29:44 · 3 answers · asked by Anonymous in Mathematics

Use DeMoivre's Theorem to write each expression in the standard form a + bi.

(1) [3(cos80degrees + isin80degrees)]^3

(2) (sqrt{3} - i)^6

2007-10-03 11:27:59 · 3 answers · asked by Anonymous in Mathematics

sum1 has 1 drink w/ 10% fruit juice n other w/ 26% fruit juice. how many qts of each must be combined to get 8 qts of a mixture that is 16% fruit juice?

2007-10-03 11:26:32 · 1 answers · asked by ravipansuriya 1 in Mathematics

Find zw and z/w. Leave your answers in polar form.

(1) z = 4[cos(3pi/8) + isin(3pi/8)]
w = 2[cos(9pi/16) + isin(9pi/16)]

(2) z = 1 - i
w= 1 - sqrt{3}i

2007-10-03 11:24:41 · 1 answers · asked by Anonymous in Mathematics

im having a test tomorrow and i have no idea

2007-10-03 11:20:20 · 1 answers · asked by Anonymous in Chemistry

Why can't you use any other type of pencil or even a pen in that matter? Art pencils are made from the same thing and yet you can't use them on scantrons because the scantron machine can't read it.

2007-10-03 11:19:58 · 6 answers · asked by LovesPets 2 in Zoology

A. 25" Hg vacuum
B. 29" Hg vacuum
C. 30" Hg vacuum
D. 25,000 microns

2007-10-03 11:18:33 · 2 answers · asked by Healy2006 2 in Mathematics

I'm asking this in terms of a physic's question. The chapter it is on is Momentum in one Dimesion.

2007-10-03 11:17:02 · 7 answers · asked by werewulf2000 2 in Physics

2007-10-03 11:15:39 · 11 answers · asked by Anonymous in Astronomy & Space

2007-10-03 11:13:58 · 2 answers · asked by Anonymous in Other - Science

They seem the same to me. Thanks for looking!

2007-10-03 11:13:17 · 2 answers · asked by bradyball48 2 in Chemistry

At McDonald's you can order Chicken McNuggets in boxes of 6,9, and 20. What is the largest number of nuggets that you cannot order using any combination of the above?

2007-10-03 11:12:49 · 10 answers · asked by Anonymous in Mathematics

so i've heard silver nitrate makes a nice temp tattoo but i've also read it's corrosive to the skin. i'm a little confused...help?

2007-10-03 11:11:14 · 1 answers · asked by Nacho DeGarvo 3 in Chemistry

I just saw a toad!

2007-10-03 11:09:52 · 24 answers · asked by Buzzard 7 in Zoology

2007-10-03 11:08:59 · 1 answers · asked by Anonymous in Chemistry

What Property is this?!
145+13=100+(40+10)+(5+3)


what property is this?

74+32=(70+30)+(4+2)

2007-10-03 11:08:58 · 1 answers · asked by Anonymous in Mathematics

Exactly how the title reads, I want to know why we turn back our clocks in the winter and turn them forward in the spring.

2007-10-03 11:08:06 · 9 answers · asked by Anonymous in Geography

1. On the base of a bulb is written: 3V, 0.15A. What does this mean?
What will happen if this bulb is connected to a 1.5V cell??

What will happn if it is connected to a 4.5 V battery??

2. For the same voltage, what happens to a current when power is doubled??
what is the power when current is halved???

thanks of answers..!

2007-10-03 11:07:53 · 2 answers · asked by Marvin Shane 2 in Physics

2007-10-03 11:05:15 · 6 answers · asked by shake it 2 in Engineering