Thursday

February 23, 2017
Total # Posts: 831

**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 don't 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 the 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*