Wednesday

June 29, 2016
Total # Posts: 788

**Physics**

A first order exponential decay can be written as A(t)= Ae^(-t/r) where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time. The fall time is defined as the time in which A(t) falls from 90% to 10% of its initial value. ...
*October 11, 2008*

**Maths**

I understand how you do it for T, but since there is more than one J, I don't understand how you make J the subject.
*October 10, 2008*

**Maths**

Rearrange for T and J; n=(2J+1)exp(-(BJ(J+1))/(KT)) where B and K are constants
*October 10, 2008*

**sublimation poems**

S olid to a gas U nder pressure B eware of the phase change L iquid phase is skipped I odine can sublime M atter A drastic change in temperature causes this phase to occur T ake CO2, it can sublime from a solid (dry ice) to a gas I t changes matter from a solid to a gas O N ot...
*October 8, 2008*

**Networking LANs**

You have been contracted to build a network for a multimedia development firm that currently uses a 10-Mbps Ethernet network. The company requires a high-bandwidth network for the multimedia team, which constantly views and manipulates large files across the network. The ...
*September 29, 2008*

**english**

An understood pronoun is when you talk to someone but leave out the word "you", because its obvious that you are talking to them. Example: "You pick that up" could be said as "Pick that up" In the second sentence the "you" is unserstood...
*September 29, 2008*

**math**

First of all I don't just need the answer I need it explained where a third grader can understand it. I actually know the answer, but I don't know how to explain it to a third grader. ?Doug has 170 stamps in his collection. His first book of stamps has 30 more stamps ...
*September 18, 2008*

**Math**

I still don't quite get how you are explaining it. Can you explain in a different way?
*September 18, 2008*

**Math**

First of all I don't just need the answer I need it explained where a third grader can understand it. I actually know the answer, but I don't know how to explain it to a third grader. ?Doug has 170 stamps in his collection. His first book of stamps has 30 more stamps ...
*September 18, 2008*

**Math**

I think I have an answer to both the first and second problem. Problem 1-It appears you are subtracting 8 each time. 64-8=56 56-8=48 48-8=40 40-8=32 64,56,48,40,32 Problem 2-It appears you are adding 5 each time. 61+5=66 66+6=71 71+5=76 76+5=81 61,66,71,76,81
*September 18, 2008*

**science**

please help me with this challenge question, as i dont quite understand it.: Yolanda makes this hypothesis: "If salt is added to water, then the water will boil at a lower temperature." She sets up and experiment to test her hypothesis, but discovers that it actually...
*September 8, 2008*

**7th grade science hypothesis question**

please help me with this challenge question, as i dont quite understand it.: Yolanda makes this hypothesis: "If salt is added to water, then the water will boil at a lower temperature." She sets up and experiment to test her hypothesis, but discovers that it actually...
*September 8, 2008*

**Chemistry**

A block of metal has a width of 3.2 , a length of 17.1 , and height of 5.8 WHAT is the VOLUME OF THE BLOCK?
*August 28, 2008*

**Integers**

When you add integers, why do you subtract? -9+5=-4. I do not understand why there is an addition sign. How do you know when you are suppose to subtract.
*July 2, 2008*

**keybording and word processing**

a.?
*June 9, 2008*

**math**

(0.2x15) : (0.8x7.5) ::_________:(0.25x56)
*May 19, 2008*

**create table**

hmmmm I have answer, why dont u do your own college work?
*May 18, 2008*

**math**

y=4x - 3, work out the value of x when y =11
*April 26, 2008*

**music**

whats an important factor of jazz?
*April 15, 2008*

**Physics**

In the formula, E = hf, what is h? Is it wavelength?
*April 4, 2008*

**Physics**

Who was the scientist who first developed the notion of quantization was...? Was it DeBrogile?
*April 4, 2008*

**Physics**

The discreteness of the energy levels of electrons about the atomic nucleus is best understood by considering the electron to be a .....?
*April 4, 2008*

**Physucs**

What model of light does the photoelectric effect support?
*April 4, 2008*

**Physics**

To say that light is quantized means that light is made up of what?
*April 4, 2008*

**Math**

Did I do this right? Find the domain and range f(x)=-4x-2 y=-4x-2 x=-4y-2 x+2/-4=-4y/-4 f(x)=x+2/-4 answer: domain (all real numbers) range (all real numbers)
*March 28, 2008*

**Math**

Find the domain and range of the inverse f(x)=-4x-2 y=-4x-2 x=-4y-2 x+2/-4=-4y/-4 f(x)=x+2/-4 answer: domain (all real numbers) range (all real numbers)
*March 27, 2008*

**Math**

My answer is domain(all real numbers) range(all real numbers) Is this right??????????????
*March 27, 2008*

**Math**

Find the domain and range of the inverse f(x)=-4x-2 y=-4x-2 x=-4y-2 x+2/-4=-4y/-4 f(x)=x+2/-4 domain (all real numbers) range (all real numbers)
*March 27, 2008*

**Economics**

Leakages from the income-expenditures stream are: A. consumption, saving, and transfers. B. saving, taxes, and transfers. C.saving, taxes, and imports. D. imports, taxes, and transfers.
*March 18, 2008*

**Science**

Why is the earth's temperature different in different places?
*March 13, 2008*

**physics**

A car (m = 640.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a height, h = 43.0 m. Find the average power the engine must deliver to reach a speed of 19.9 m/s at the top of the hill in 23.9 s(NEGLECT frictional losses: air and rolling, ...)
*March 2, 2008*

**MBA Financial Accounting**

How do you figure the total expense of two loans to show for year ending Dec. 31, 2006? The annual payment date is Sept. 30 with first payment due 2007.
*February 23, 2008*

**accounting**

Net income is the difference between revenues and expenses when revenues exceed expenses for a specific time period.
*February 23, 2008*

**geometry & measurement**

jose wants to buy a new tv that will fit the opening of his entertainment center. the height of the opening in his entertainment center is 27 inches. usually, the opening of an entertainment center has a width-to-height ratio of 4:3. what is the diagonal measurement of the ...
*February 23, 2008*

**sceince**

what is O2??
*February 21, 2008*

**STATISTICS**

The seeds of the garden pea are either yellow or green. A certain cross between pea plants produces progeny in the ratio 3 yellow:1 green. If four randomly chosen progeny of such a cross are examined, what is the probability that: a)3 are yellow and 1 is green b)all 4 are ...
*February 5, 2008*

**Spanish very confused.**

1.estas 2.estar 4eres 5.es 6.es 7.son
*February 5, 2008*

**English**

Can someone tell me the physical and character traits of these characters in A Raisin in the Sun: Lena, Walter, Beneatha, Ruth, George Murchinson, and Joseph Assaigal?
*January 26, 2008*

**algebra**

find slope of any parallel line through points (9,6) and (1,2)
*January 21, 2008*

**african american hist.**

what is the former slave that traveled the contry to speak out against slavery
*January 21, 2008*

**Pre-Algabra**

Making a pie chart,, can't figure out how to change from percent to degree. can someone help
*December 12, 2007*

**Math**

To determine if 3417 is prime, you would have to try dividing 3417 by every whole number less than 3416. True or false and how did you get the answer
*December 4, 2007*

**Math**

How did you get this answer I have been pondering over it for 2 days. You are a genius. Thanks
*November 30, 2007*

**Math**

(2.3x 10(exp-8))x (3.77x 10(exp-7)
*November 30, 2007*

**Literature**

I need help how Edwards answered the following questions in "Sinners in the Hands of an Angry God." 1. Is it enough to lead a good and decent life? Why? 2. Is it enough to believe in God? Why? 3. What role does having a good physical constitution play in salvation? ...
*November 26, 2007*

**COM 125**

What is the difference between a hard copy resume and an online distribution?
*November 11, 2007*

**Com 125**

The purpose of this assignment is for students to create résumés for hardcopy and online distribution as well as a job-application letter to accompany one of the résumés. Students will also determine the differences between these two kinds of r&...
*November 10, 2007*

**powerpoint**

Go to View, Header and Footer, there will be a box for Footer, type in what you want there, and press Apply, or Apply All if you want the footer on every sheet.
*November 1, 2007*

**Physics**

When is your weight normal, higher, or lower while moving up and down in an elevator?
*November 1, 2007*

**women studies**

Hello, I need help in finding some answers to this question? How are families both places of comfort, security, and nurture, and at the same time places of domination, conflict, and violence. Thanks
*October 29, 2007*

**science**

Hello, need help finding this answer to this question. What is the hydrolic cycle and how does it work?
*October 23, 2007*

**science**

Hello, need help finding this answer for this question? Why are mudslides mainly limited to dry environments? Thanks
*October 15, 2007*

**Physical Scinece**

an exact quantity people use for comparison
*October 9, 2007*

**Physical Science**

Here's a question from my homework that I have no idea where to even beging with it. A European "weighs" 100 kg on Earth. a. What is his mass on Earth? b. What is his weight on Earth? c. What is his mass on the moon where the acceleration due to gravity is 1/6 ...
*October 4, 2007*

**Physical Science**

This is the question in my homework: In orbiting the Earth, what kind of motion is it, uniformly velocity, uniformly accelerated or non-uniformly accelerated motion? I have searched for almost an hour on the internet in any variety of those terms I could think of, and I still ...
*September 25, 2007*

**Physical Science**

In the equation length = t^2 * g/(2PI)^2, what do the symbols ^, *, and / represent?
*September 23, 2007*

**Physical Science**

In the above equation(length=t^2 * g/(2PI)^2), what do the symbols ^ and * represent? (Sorry, but this is my first semester back at college after ten years of being a stay-at-home mom, so I'm VERY rusty on a lot of areas.)
*September 23, 2007*

**Physical Science**

My homework is to do some exercises on the Foucault Pendulum. I'm stuck on several of the problems. One is to find the approximate angle of rotation of the earth in one day at our latititue, which is 39.9. I found the equation n = 360 sin of latitude, but I have no idea ...
*September 23, 2007*

**Math**

Find out how many inches are in a square foot and then multiply that by 385.
*September 17, 2007*

**physics**

Also I needed help finding the electric field at the position of the test charge!
*September 16, 2007*

**physics**

A test charge (q=-5uC) lies between two positive charges: 3cm from a 2uC positive charge, and 2 cm from a 3uC positive charge. Find the force and direction (in newtons) on the test charge. I know I have to use Coulomb's law: so: F = KQ/r^2 = 8.99e9*2e-6/.03^2 F = 8.99e9*3e...
*September 16, 2007*

**Science**

My physical science class is doing an experiment on the mass of pennies. I hypothesized that newer pennies would have less mass because cheaper materials are being used. I found that before 1982, pennies were made from 95% copper/5% zinc, and after 1982 from 99.2% zinc/0.8% ...
*September 8, 2007*

**calculus-rate problem**

A conical tank (with vertex down) is 10 feet acros the top and 12 feet deep. If water is flowing into the tank at a rate of 10 cubic feet per minute, find the rate of change of the depth of the water when the water is 8 feet deep.
*August 30, 2007*

**grammar**

in the sentence Jack told me. Is me the direct object or the indirect object? I am confused b/c I could say Jack told the secret to me. TIA!
*August 23, 2007*

**Math**

I need to find the value of x. 5(x-4) = 3(x+8) Trying to help my niece and haven't done this stuff for 20 years. :) 5(x-4) = 3(x+8) 5x - 20 = 3x + 24 5x - 3x = 20 + 24 2x = 44 x = 22 I hope this brings back the algebra you studied 20 years ago. :-) By the way -- to check ...
*August 6, 2007*

**Biology**

I'm looking for an explanation of the clotting cascade. It is supposed to be complete, but not 5 pages long! I put "clotting cascade" into Google search and received a wealth of information. Check these out. http://www.google.com/search?hl=en&ie=ISO-8859-1&q=...
*July 27, 2007*

**chemistry**

write the formula for potassium chloride. KCl thanx, but i gave you the wrong one. we're studying acids and bases, and so it's actually hypobromous acid. HBrO
*May 29, 2007*

**physics**

A friend in a spaceship travels past you at a high speed. He tells you that his ship is 20m long and that the identical ship you are sitting in is 19m long. According to your observations, (a) how long is your ship?? (B) how long is his ship?? (c) what is the speed of your ...
*May 29, 2007*

**physics**

A box is cubical with sides of proper lengths L1=L2=L3=2.0m when viewed in it own rest frame. If this block moves parallel to one of its edges with a speed of 0.80c past an observer, (a) What shape does it appear to have to this observer, and (b) What is the length of each ...
*May 29, 2007*

**physics**

A person has far points 8.44cm from the right eye and 12.2cm from the left eye. WRite a presciption for the powers of the corrective lenses. Please help i tried to read to book and my notes but it doesnt show how to do this problem. http://www.owlnet.rice.edu/~phys126/Labs/...
*May 24, 2007*

**Algebra**

Please help me complete the square...I'm lost! x^2+y^2-1/2=-x-y
*April 4, 2007*

**science**

Why dont perfect convection currents reach the North Pole from the equator? Land masses and other currents interfere.
*March 25, 2007*

**Punctuation**

I need to be sure that I punctuated these sentences properly. Each group emphasizes on a particular punctuation mark. Punctuation within Sentences—Colon 1.
*March 19, 2007*

**Spanish**

how do you say book,desk, pen, pencil, notebook, folder, paper and book in spanish?
*February 5, 2007*

**math/reading**

If a=1, b=2, c=3, d=4, e=5, f=6 I need to find any combination of these letters that creates a number value more than 30. you can use the letters as many times as you need to. so far I can only think of effaced, but that is only 30.. any help?
*January 31, 2007*

**Chemistry**

Alkanes have weaker intermolecular forces than alcohols because they have no hydrogen bonding, only dispersion forces.
*January 22, 2007*

**math**

Determine whether this function has a mzximum or minimum value and then find that value: f(x)=2x^2 + 3x -9 The derivative, f'(x) = 4x +3, is zero when x = -3/4 . That means there is a relative extreme value (either maximum or minimum) there. The second derivative is f'...
*December 28, 2006*

**3rd grade social studies**

cool thanks
*December 5, 2006*

**Fact Familys**

cool what would this one be 7 8 15
*November 30, 2006*

**unknown riddle**

"JOHN DECIDES HE DOESn'T WANT TO WORK, HE TURNS OFF HIS LIGHT AND LEAVES. 200 PEOPLE DIE. WHAT WAS HIS JOB?" to turn off the light and leave The man who runs a lighthouse. You're missing the part of the story where the man is watching the news saying a ship ...
*November 2, 2006*

**Math**

(2 questions) Factor each expressions 1) 2c + 2d - cd - d^2 2) abd - abe + acd -ace First rearrange: 2c - cd + 2d - d^2 = c(2-d)+d(2-d)= (2-d)(c+d). The second one is done using the same kind of procedure. Post your work and tell us what you don't understand if you get ...
*October 25, 2006*

**AP chem**

It takes 208.4 kJ of energy to remove 1 mole of electrons from atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom ont eh surface of solid rubidum? What is teh maximum wavelength of light capable of doing this? If 208.4 ...
*October 1, 2006*

**Art**

Okay, I am having to do a presentation on Installation art, and it's significance and it's purpose etc. It's more analytical than a book report kind of thing! Thank you for using the Jiskha Homework Help Forum. Here is a site that also has links for you: ...
*September 20, 2006*

**finding midpoint of a line with given interval**

my question is given the interval 2 is less than or equal to x which is less than or equal to 10; find the midpoint of a the line y = 4x+8 the midpoint x is given by x=1/2 (2+10)=6 what is y when x=6? THAT IS HARD CUZ I'M JUST IN ALGEBRA I AND WE HAVEN'T LEARNED THAT ...
*August 7, 2006*

**Science**

If you are one mile off the beach in the Atlantic Ocean, how deep is the ocean? Thanks for your help. Which beach? Is it in Europe, North America, Africa, South America or Antarctica? We'll try to research your question if we know the exact location of your beach. Since ...
*August 5, 2006*

**Math**

What is tbe next row of the following table? 0 2 2 2 0 0 0 0 0 0 2 4 6 4 2 0 0 0 0 2 6 12 14 12 6 2 0 0 2 8 20 32 38 32 20 8 2 2 2 2 4 6 4 2 2 6 12 14 12 6 2 2 8 20 32 38 32 20 8 (2) Notice in this arrangement any number is the sum of the number above it plus the numbers on ...
*September 1, 2005*

**unscrambling word**

it is a science term and could be more than one wrrd csellmpilbveyraeetee
*June 14, 2005*

**unscrambling word**

csellmpilbveyraeetee
*June 14, 2005*