# Posts by josh

Total # Posts: 1,876

**Statistics**

A simple random sample of 25 has been collected from a normally distributed population for which it is know that o=17.0. The sample mean has been calculated as 342.0, and the sample standard deviation is s=14.9. Construct and interpret the 95% and 99% confidence intervals for ...

**Statistics**

From past experience, an airline has found the luggage weight for individual air travelers on its trans-Atlantic route to have a mean of 80 pounds and a standard deviation of 20 pounds. The plane is consistently fully booked and holds 100 passengers. The pilot insists on ...

**Pysical Science**

Mass of C3H8 Reacted with (g) Mass of O2 Reacted (g) Mass of CO2 Produced (g) 44 160 132 250 909 750 400 1,455 1,200 465 1,691 1,395 6. Based on the data in the table, how do you know that carbon dioxide is not the only substance formed in this chemical change?

**physics**

What average force in N is required to stop an 1,188 kg car in 9 s if it is initially traveling at 89 km/h? f=ma f=1,188(9.8) f=11642.4N This looks wrong to me. Can someone explain this to me.

**sanches**

A wire carries a 15 microampere current. How many electrons pass a given point on the wire in 1.0 ?

**health**

Write a 700- to 1,050-paper responding to the following: You have recently been employed by a small local hospital as an administrative assistant in the emergency room. The hospital does not provide any behavioral health services. You are assigned the task of gathering ...

**Economics**

Does a Contractionary Fiscal Policy help lower inflation? Or does Expansionary Fiscal Policy lower inflation?

**Chemistry**

How many grams are in a milliliter?

**MATH**

QUESTION: rounded to the nearest ten, i am 320, the sum of my digits is a multiple of 6 i am even.

**5th grade**

i re posted the question the way it is reading from my homework page. thanks for your help.

**5th grade**

i want to see if my answer is correct & that i am understanding this. question: round me to the nearest ten, i am 320 the sum of my digit is a multiple of 6 i am even. My Answer = 24 20 ten 24 2+4 =6

**chemistry**

Calculate the partial pressure of 24 g methane, 48 g of oxygen and 56 g of nitrogen contained in a 25L container. What is the total pressure.

**physics**

TY SIR. It extremely helped. I really appreciate your time..

**literature - 11th grade**

define "period structure

**Engineering**

A person rappels down a cliff. The person uses a 0.5 inch diameter rope, creating a 170-lb internal force. What is the normal stress in the rope. I got 340 by diving 170 from .5 is this right?

**Physics**

I got -2.84E14 plugged it in and got the wrong answer

**Physics**

A -3.5uC charge experiences a 13 ihat-N electric force in a certain electric field.What force would a proton experience in the same field? I got -7.28*10^-18 from (1.6*10^-19)(-45.5) I got -45.5 from multiplying 13 by -3.5 What am I doing wrong?

**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*...

**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 ...

**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 ...

**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 ...

**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'...

**Geography**

this didn't help me at all

**Geography**

i will just give you a pass

**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, ...

**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, ...

**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)

**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 ...

**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 ...

**edisto**

What percent of 105 is 70?

**Math riddle PIZZAZZ Worksheet**

i need help on my home work a-72

**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 ...

**Math**

Thank u it really helped!

**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

**math**

Recrefcrfcfrece. Fucjj. Crcfrjhcnfirucbfirucn. CRAP

**world geogrophy**

north

**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 ...

**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 ...