Friday

August 1, 2014

August 1, 2014

Total # Posts: 1,454

**Physics**

How do you do that

**Physics**

Take q1=23uC at (0,1), q2=16uC. at (2,0), and q3=? at (2,2). IF the force on q1 points in the -x direction, (a) what is q3 and (b) what is the magnitude of the force on q1? I know a is 16uC For part B I got .067 am I right I am using Coloumbs law k=9.0*10^9 q1=23*10^-6 q2=16*1...

**Physics**

what will q be for both questions

**Physics**

A proton is at the origin and an electron is at the point x = 0.41 nm, y = 0.36 nm. Find the electric force on the proton. I got 7.529 *10^-11 but it wants the answer for fx and fy how do i get that?

**Physics**

There are two positive charges (+4C on the left and +6C on the right) that are both separated by an arbitrary distance. In order not to experience any net electric force where would you place the third charge. I say to the left of the +4C charge am i right?

**CHem**

How many oxygen atoms do you have in 2.00 grams of calcium phosphate? My answer is 3.9*10^22 by multiplying avogadros number by (2/31) Am I close? How many Ca^2+ ions do you have in 2.00 grams of calcium phosphate? I am getting 39, am i close? since there are 3 Ca2+ ions per m...

**Physics**

There is a flash of lighting that gives out a 25 C of negative charge from cloud to ground. Determine the amount of electrons involved? Do i use the formula F=qE I know one coulomb is 1.6 * 10 ^-19

**Chem**

How many oxygen atoms do you have in 2.00 grams of calcium phosphate? Do you use avogadro's number and how? How many Ca^2+ ions do you have in 2.00 grams of calcium phosphate? Any help would be greatly appreciated.

**Chem**

What is the name of Co2(C2O4)3 is it cobalt (2) tris ethanedioate

**Physics (Astronomy)**

Hi, what keeps objects in orbit, for example, preventing the moon from crashing into the earth under the force of gravity? I have read that it speeds up as it gets closer to earth but I don't understand why. Can someone help me? Thanks.

**Math**

375 is what percent of 500?

**communication**

What was your experience with the Center for Writing Excellence (CWE) in the past? In addition to the CWE, what other writing tools are available for revising a research paper? How can you become your own editor and review your writing with a critical eye?

**psych**

For this assignment, you will create a Microsoft® PowerPoint® presentation. Your presentation must briefly summarize how psychological disorders are classified including the role of the DSM IV. Your presentation must have at least one slide for each of the major classe...

**Chemistry**

Hi!! Okay So I have this question here and you have to pick the false statement. Now I believe its a or e. But I really can't decide which it is. I might be totally wrong about this which is why I need some help... please! These are the options: a. the bond length is the t...

**Chemistry**

Hi! I have a question about Pi-Bonds: a. ) are the only kind of bonds present in double bonds b. ) have very little electron density along the internuclear axis c. ) are formed by endwise overlap of p-orbits d. ) are formed from hybrid orbitals e. ) are formed from s-orbitals ...

**maths 4th grade**

hello i need help with time table i really need help can you help because i really need help and i aslo need help with reading

**algebra**

we have a triangle with side a,b,&c. Side b=1,c=sqrt10 what is the length of side a?

**Monroe**

What do economist believe about future business cycles?

**algebra II**

Simplify. 2 square root 2(5 square root 10- 3 square root 2)

**Math**

I think there is supposed to be a few open spaces, maybe its we cant elope

**Algebra**

jon can type a report in 9 hours, nick can do the same job in 5 hours. How long would it take to type if they did it together?

**8th Grade Science**

Yeah,I've been wanting to ask that too.

**college al**

y=2x^3√9-x^2

**algebra**

find center and radius of circle with given equation: (x+4)^2 + (y-4)^2 = 25

**8th grade**

UH OH, Im getting this in grade 9 acedemic,

**9th grade weighte average**

how should i do weighted average

**Chemistry-Urgent Help Please**

What are the differences between -ate, -ide, -ite, and the other suffixes? What are some ways of remembering? Thank you for clarifying this.

**Chemistry**

What are the differences between -ate, -ide, -ite, and the other suffixes? What are some ways of remembering? Thank you for clarifying this.

**Math**

how did you get that. not rudely.

**Math**

dont get it

**Math**

The area of a rectangle is 90m 2. The base is three less than three times the height. What is the perimeter?

**12th grade Data**

In this sequence, tk is a factorial number, often written k!. Show that tk=k!=k(k-1)(k-2)...(3)(2)(1)

**CALC**

no one to help me?????

**CALC**

what is the arc length of y=x^4/8 + 1/(4x^2) [-1,-2] i have tried this many times but i am not achieving the answer of 33/16 which is supposed to be correct....much help is appreciated

**math**

(a) Use the Midpoint Rule and the given data to estimate the value of the integral I. (Give the answer to two decimal places.) I = int_0^3.2 f(x)dx 1 x f(x) x f(x) 0.0 7.3 2.0 8.8 0.4 6.8 2.4 7.3 0.8 8.1 2.8 7.6 1.2 7.6 3.2 7.3 1.6 8.2 (b) If it is known that -5 ≤ f'...

**6th grade_Science/Math**

hey get a life

**Math**

Josh and Mike live 13 miles apart. Yesterday Josh started to ride his bicycle toward Mike's house. When they met, Josh had ridden for twice the length of time as Mike and at 4/5 of Mike's rate. How many miles had Mike ridden when they met? (a) 4 (b) 5 (c) 6 (d) 7 (e) 8

**Statistics**

That answer is wrong

**Poetry (9th grade)**

This is a poem by Alice Walker and a question at the end but I can't figure out the question. Poem title: "Good Night, Willie Lee, I'll see you in the morning." Looking down into my father's dead face for the last time my mother said without tears, withou...

**calculus**

lim x->(pi/3) (cos x -(1/2))/(x-(pi/3)) is?

**calculus**

o alright thank you drwls

**calculus**

is it 2ln 2?

**calculus**

Can someone help me with the problem? f(x)={ln 2x, 0<x<2 {2lnx, x >or= 2 The limit lim x-> 2 f(x) is?

**Physics**

thank you for that answer you are amazing!

**speech**

What are the 5 Communication acts?

**language arts**

analogie for broom is to sweep as brush is to?

**Math**

5x-14=8x+4

**IT Programming in South Africa for a 2007 matric..**

IT Programming in South Africa for a 2007 matriculant? I matriculated 2007 with a Senior Certificate : HG Afrikaans 2nd Lang 45% HG English 1st Lang 51% SG Maths 66% SG Science 49% HG Biology 44% SG Computers 62% And I have experience with ms-dos, vbscript, javascript, css, ht...

**Algebra (y=kx)**

just read my other question and u will find the question. but i really need he- lp!!!!!!!!!!!!!!!!!!!!!!!!!!!

**math**

ho do i make a y=k x problem with facts like: exports $465.3 billion and imports 402.4 billion?

**Science**

definatley c

**chemistry II**

I search the web and my texbook doesn't have the answer so please help What are the four steps of a process involving a heterogeneous catalyst?

**8th Grade Algebra**

just go 2 google and google it!

**4th grade**

2-1=1

**9th grade**

Need help with (x+5)(3xsquared-2x+1)

**3rd grade**

yes

**math**

The scientists Verhulst (1828) where is the natural growth rate of the population when resources are limited and is a positive constant called carrying capacity of the environment. (a) Using sign analysis, find all constant solution and discuss the general behavior of solution...

**math**

The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are limited and is a pos...

**math**

The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are limited and is a pos...

**edisto**

What percent of 105 is 70?

**Math**

Find all the points of intersection of the surfaces whose equations are as follows: z^2 = 2xy - 100 and x^2 + 2y^2 - 100 --------------------- 2y

**Math**

Find all the points of intersection of the surfaces whose equations are as follows: z^2 = 2xy - 100 and x^2 + 2y^2 - 100 ---------------- 2y

**EARTH SCIENCE**

i messed up were i put a plus theres supposed to be =

**EARTH SCIENCE**

i have to do a packet and i cant under stand it. it says ' sea level 10 degrees = 1 atmosphere and then i have to do tropopause ,stratapause and mesopause and the rest of it says . an atmosphere is a unit of air pressure . 1 atmosphere +average air pressure at sea leve und...

**math**

Add 9+5 first then Subtract 2 minus 4 and once you get both of those answers subtract them (9+5)-(2-4) 14 - 2 =12

**math**

how do you work out bearings for y8 maths homework

**algebra**

multiple 2 into the brackets then solve for m

**Science & Art - Gr 12 (correction)**

As someone has already stated, this energy would probably be plasma energy, not electricity.

**Science & Art - Gr 12**

Note : All feedback will be greatly appreciated! Hey guys, thanks for the help earlier on about the "invisibility cloak". Anyway, I'm interested to know how one would go about generating a fairly independant sphere / ball of pure plasma / electric energy suspende...

**Science & Art - Gr 12**

Awesome you guys.

**Science & Art - Gr 12**

Hey SraJMcGin, Haha, yes. It certainly does raise some questions! D:

**Science & Art - Gr 12**

Invisibility. I've been reading all over the place about this, but mostly sensational. Some, however, state that the Government has been working on a sort of "invisibility cloat" for military, air force and marine tactics. But get this, it works on the basis that...

**Science & Art - Gr 12**

Hi Ms. Sue, I am not a frequenter of Jiskha, and not that familiar with how it works. So please bear with me. Having said that, thanks for the input.

**Science & Art - Gr 12**

Does anyone know some of the physics behind this or is it too advanced?

**Science & Art - Gr 12**

Invisibility. I've been reading all over the place about this, but mostly sensational. Some, however, state that the Government has been working on a sort of "invisibility cloat" for military, air force and marine tactics. But get this, it works on the basis that...

**Science & Art - Gr 12**

I don't mean through psychic forces..... umm....... let me rephrase : How would one go about generating a ball of electrical energy?

**Science & Art - Gr 12**

Hey Bob. How exactly would that apparatus work? I'm assuming it runs on a cercuit, so the electricity would pass through the ionized gas in a visible form??? You also mention low pressure. This would be important because the gass would need to move. And since a current is ...

**Science & Art - Gr 12**

What would it take to generate a ball of pure visible electrical energy in my hands??? Can anyone explain to me a sort of apparatus? I am an avid Artist, and like my science. So I'm trying to work within the boundries of as-realistic-as-possible. A sort of rational explana...

**Physical Science**

find the mass of a notebook that has a weight of 16.4 newtons

**pre Calculus**

this is pretty simple you just find the equation of the line, this would be y=1/2(x+2)+7 =1/2x + 8 and if you graph that, u should be able to pick any addional points on that line.

**algebra**

thanks drbob

**algebra**

1/2x+6=1/3x Please help. my college grad mom can't help with my 8th grade math!

**algebra**

1/2x+6=1/3x

**11th grade u.s. history**

also remember that there are two groups, Puritans, and more religiously zealous puritains called Seperatists. The Seperatists were the puritans who went to the new world (america) and founded Massachusettes to create a land of religious oppurtunity and purity.

**literature**

WHAT IS A WONDER QUESTION? my english teacher assigned me a summer assignment and one of the question says: 2. Writing raises questions. Write a wonder question the book raises for you. Wonder questions ask about the significance of something you observe; they are analysis, no...

**science**

Can you please explain to me how to determine the control of an experiment? The experiment we have been given is determining which liquid (fruit juice, cola, water, etc.) would make the more significant impact on a chicken bone when emersed. What would the control be?

**bio**

what is the role of ATP in muscle contraction? What is the role of calcium in muscle contraction?

**chem**

What do question about Aluminum, hand this is some general question about it can someone help me to answer them Why is it wise to clean the aluminum? Why is the reaction done in the hood? Why must suspended solids be removed from the basic solution? Why is an ethanol-water mix...

**chemistry**

Why is it wise to clean the aluminum? Why is the reaction done in the hood? Why must suspended solids be removed from the basic solution? Why is an ethanol-water mixture, rather than pure water, used to wash the collected alum?

**English/Grammar (supplement post)**

Areas I was looking at that may need some corrections: on or onto hand-written, NS list or hand-written NS list (with , or without ,) printout or print-out (with – or without -) Once all of the laundry was checked in, the check-in report was printed. The same procedure fr...

**English/Grammar**

May I have someone proofread for spelling/grammar please? Friday, July 4, 2008 Using the hand-written, no slot (NS) list of grave shift, the names of the employees that still had uniforms to collect in the back of auto load were typed onto an Excel spreadsheet and saved as Lau...

**investing compound interest**

James Johnson, a recent graduate of a nationally recognized MPA program wants to be able to travel around the world. James does not have enough money at this time, but believes he can save up enough money to travel around the world in ten years. If he currently has $15,000 to ...

**chem**

ionic compounds are composed of

**PHYSICS**

how to calculate formula for period of a cylinder that depends on radius(cm), length(cm) and time(sec). If a radius is 3.84 and at length(30)=.83sec length(100)=3.31sec length(200cm)=6.04sec

**Pre Calculus**

Can someone help me with this problem...I have no Idea how to do it. Find the area between each curve and the x-axis for the given interval. y=16x-x^3 from x=0 to x=4 Thanks for the help>>

**A good programming forum???**

I'm working with VBScript and Javascript all the time... need help.

**programming**

How do I delete a file on my shared LAN network with vbs??? 1. The vbs file is in the same directory as the file i need deleted 2. How do I do this without having to declare long locations??? Anybody? help would be appreciated thanks

**art**

Was wondering, what kinda job I could get with a BTEC National Diploma in Fine Arts???

**programming**

Sorry... double post!

**programming**

I keep getting a 'Code 0; Permission Denied' error, while trying to run some .hta embedded vbs over my LAN Network, but when I run it locally (on my desktop) its just fine. My guess is this has something to do with writing to and / creating files in the .hta's loca...

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