Science & Mathematics - 11 October 2007

horizontal force of 19.2N. Find the speed of the block after it has moved 4.9m. answer in units of m/s.

2007-10-11 06:49:51 · 1 answers · asked by sexysaraxx 4 in Physics

I am having trouble solving these 2 problems - I get the first part of the answer right, but am stumped on how to get the rest of it. Please help!

1. 7-5r^2+r^4 / r^2-4


2. (2a^2-42a+54) / (3a+9)



Thank you!!!!

2007-10-11 06:49:15 · 1 answers · asked by higherlovetx 5 in Mathematics

The Haber process is the principal method for fixing nitrogen (converting N2 to nitrogen compounds).
N2(g) + 3 H2(g) 2 NH3(g)

Assume that the reactant gases are completely converted to NH3(g) and that the gases behave ideally.

(a) What volume of NH3(g) can be produced from 257 L of H2(g) if the gases are measured at 315°C and 5.01 atm?

(b) What volume of NH3(g), measured at 25°C and 727 mmHg, can be produced from 257 L H2(g), measured at 315°C and 5.01 atm?

2007-10-11 06:47:10 · 2 answers · asked by toocool 1 in Chemistry

If an intravenous solution contains 4 percent mannitol how many milliliters of the solution should be administered to provide a patient with 80 grams of mannitol?

2007-10-11 06:45:45 · 4 answers · asked by whisper2ya 2 in Mathematics

150 grams is dissolved in enough water to make 500 ml of the solution what is the persentage strength of the solution?

2007-10-11 06:42:56 · 1 answers · asked by whisper2ya 2 in Mathematics

2007-10-11 06:40:46 · 2 answers · asked by whisper2ya 2 in Chemistry

i get x = 1/3 is that correct or is it negative

2007-10-11 06:38:57 · 7 answers · asked by shawna 2 in Mathematics

...then human being first developed during which month of the year???



Does anybody know the answer for this??? This is one of the questions from my astronomy test

2007-10-11 06:38:49 · 19 answers · asked by G@BY 1 in Astronomy & Space

2007-10-11 06:37:09 · 1 answers · asked by ggmal8 2 in Chemistry

a newborn is diagnosed with sickle cell anemia a genetic disease in which substitution of one amino acid results in abnormal hemoglobin. explain to the parents how the substitution can have such a drastic effect on the structure of the protein.

2007-10-11 06:34:36 · 2 answers · asked by lindi 2 in Medicine

2007-10-11 06:34:30 · 3 answers · asked by ggmal8 2 in Chemistry

A thin rod has a length of 0.831 m and rotates in a circle on a frictionless tabletop. The axis is perpendicular to the length of the rod at one of its ends. The rod has an angular velocity of 0.894 rad/s and a moment of inertia of 1.14 x 10-3 kg·m2. A bug standing on the axis decides to crawl out to the other end of the rod. When the bug (whose mass is 5 x 10-3 kg) gets where it's going, what is the change in the angular velocity of the rod?

2007-10-11 06:34:23 · 1 answers · asked by txsweetpea512 1 in Physics

Who wins?

2007-10-11 06:34:21 · 6 answers · asked by Anonymous in Zoology

move?

2007-10-11 06:32:51 · 10 answers · asked by Anonymous in Astronomy & Space

How do you find all possible roots of this equation and how do you find zeros? Im home sick with mono with no one to ask.
2x^4-x^3 -2x^2+5x+1

2007-10-11 06:32:18 · 4 answers · asked by Anonymous in Mathematics

2007-10-11 06:31:32 · 5 answers · asked by Anonymous in Physics

I just started taking 10mg pills and I like to take them every school day. I'm wondering if adderall gets weaker the longer you take it and how long does it usually take before I need to increase my dose. Thanks.

2007-10-11 06:29:52 · 2 answers · asked by Kingcobrasss 2 in Medicine

The length of a rectangular solid is twice the width, and the height is three times the width. If the volume is 162 cubic meters, find the surface area of the solid. Show all work.

2007-10-11 06:27:07 · 5 answers · asked by Cakes L 1 in Mathematics

A driveway 30 feet long and 18 feet wide is to be paved with blacktop 4 inches thick. How much will the blacktop cost if it is sold at the price of $175 per cubic yard? Show all work to receive credit.

2007-10-11 06:26:33 · 5 answers · asked by Cakes L 1 in Mathematics

2007-10-11 06:23:37 · 11 answers · asked by merixon10 1 in Geography

Anyone have three types of process that require a cell to expend energy?

2007-10-11 06:18:23 · 3 answers · asked by technicality 2 in Biology

2007-10-11 06:17:19 · 3 answers · asked by Trystan D 1 in Earth Sciences & Geology

∫2dx/(x² -1)

2007-10-11 06:14:36 · 2 answers · asked by Anonymous in Mathematics

any ideas? something stereotypical..if there is one

2007-10-11 06:09:10 · 7 answers · asked by Anonymous in Earth Sciences & Geology

i need to know a method to find out hookes law constant..using a spring, metre ruler, masses and a retort stand..how would one do that??? :s please help

2007-10-11 06:08:22 · 3 answers · asked by rogla 3 in Physics

2007-10-11 06:02:51 · 2 answers · asked by Anonymous in Physics

I was (mildly) amused when I recently got corrected for saying 'I'll come down on Saturday' when discussing a planned journey from Manchester to Edinburgh with my potential Scottish hosts - 'actually you are coming up (because we are north of you)' was the response. The notion of there being and valid up or down when you are travelling on a spherical body seemed rather strange. They are perceiving the journey as it appears on a map, and yes, when viewed the conventional way around Edinburgh does indeed appear above Manchester. It's interesting to me how the shapes of the land masses on our planet have become so ingrained as viewed from a conventional cartographic orientation that a lot of people have difficulty recognising the shapes of countries if they are not presented with north at the top. I understand the need for conventions and I suppose North may just as well be at the top of the map as South (or east or west for that matter) - but who actually decided this in the first place?

2007-10-11 06:02:30 · 9 answers · asked by Anonymous in Geography

2007-10-11 06:00:41 · 7 answers · asked by Anonymous in Astronomy & Space

Is it because the derivitives of different constants are zero such that if P(x)=0, the zero can be sent to more than one function when going the other direction? How do I know it's onto?

2007-10-11 05:59:30 · 2 answers · asked by Fred 1 in Mathematics

2007-10-11 05:57:43 · 11 answers · asked by brummievic 1 in Weather