# Posts by Ethan

Total # Posts: 262

**Physics**

A unit of area often used in measuring land areas is the hectare, defined as 104 m2. An open-pit coal mine consumes 99 hectares of land, down to a depth of 28 m, each year. What volume of earth, in cubic kilometers, is removed in this time?

*January 12, 2011*

**social studies**

Which mountain range is at 43 degrees north and 0 degrees?

*January 12, 2011*

**math**

Books never written

*January 8, 2011*

**Physics**

When an object is thrown into the air, relate it's mechanical energy to kinetic and gravitational energy.

*December 14, 2010*

**Physics**

Describe situations where no work is done and situations where work would be done?

*December 14, 2010*

**earth science**

I need to draw a diagram showing delta, oxalate, tributary and meander. I also need to draw a diagram showing water table, zone of saturation, cone of depression, working well, dry well, aquitard, aquifer, spring, perched water

*November 11, 2010*

**english**

swag

*October 15, 2010*

**algebra 2**

how do i solve x^4-13^2+40?

*October 12, 2010*

**6th grade - EARTH SCIENCE**

no

*October 11, 2010*

**fractured math definitions**

Coincide. A pun on go inside

*September 8, 2010*

**chemistry**

A precipitate of calcium phosphate is formed when aqueous solutions of sodium phosphate and excess calcium chloride are mixed. If 100.0 mL of 1.5 M sodium phosphate solution is the limiting reactant, how many grams of calcium phosphate can be expected?

*September 3, 2010*

**English Essay Title**

That sounds like a good title! Thanks!

*August 28, 2010*

**English Essay Title**

What would a good essay title be if I'm writing an essay about a character in a book who is torn between two conflicting forces?

*August 28, 2010*

**Books**

Thanks!

*August 23, 2010*

**Books**

Homework Help!!! (Books)? I have a homework assignment and I really need help. I'll be very thankful and pleased if anyone can help. Compare the Adventures of Huckleberry Finn to The Glass Castle mainly the characters and the challenges they face through out each book. I ...

*August 23, 2010*

**English**

What are some good intepretive discussion questions for the book This Boy's Life by Tobias Wolff

*August 14, 2010*

**Math11U**

I don't know the answer, but I know that in this particular question the plane is flying at an altitude of 9750 metres.( The q. is in Nelson Functions 11 pg.319 #8)

*July 21, 2010*

**geometry**

Find the volume of a rectangular solid with the following dimensions: 2ã3 cm x 7ã5 cm x 4ã6 cm.

*June 2, 2010*

**calculus**

Find the fourier series of F(x) = 1, -L<=x<0 = 0, 0<=<L f(x+2L) = f(x)

*April 27, 2010*

**social studies**

were the colonists'protest sucessful

*April 14, 2010*

**6th grade**

what is the industrial revolution

*February 25, 2010*

**math**

y+2x=3, y+2x=-4

*February 17, 2010*

**grammar**

Thank you.

*February 12, 2010*

**grammar**

Where is the adverb located in the following sentence? "Timothy was not so sure that he liked Ethan as much now that he was being mean to everyone."

*February 12, 2010*

**algebra**

How would I find three different quotients that equal 5 to the negative 7th

*February 5, 2010*

**writing**

how can i answer the question...SHOULD NUTRALIZED CITIZENS BE PRESIDENT?

*January 27, 2010*

**math 156**

what number is between 0.1 and 0.24

*December 3, 2009*

**chemisrty**

I have no idea how to do this activity..can someone please help!? In this activity you will investigate how chemical reactions are limited by the amount of reactants present. You will be using paper clips to represent atoms. You can describe the quantities of reactants and ...

*November 16, 2009*

**science**

For the reaction 2Na(s) + Cl(g) ¨2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?

*November 13, 2009*

**science**

Which of the following would be the limiting reagent in the reaction shown below? There are 50 molecules of O2 and 50 molecules of H2. 2H2(g) + O2(g) ==> 2H2O(g)

*November 13, 2009*

**science**

what is the volume of water ? how do I describe this ?

*November 10, 2009*

**5th grade**

show me examples of dot arrays

*September 15, 2009*

**pre algebra**

- 2 + 5 = +3

*July 19, 2009*

**Math word problem**

This is all I was provided. I don't get it either.

*January 13, 2009*

**Math word problem**

you buy a bottle of juice for $1.00. The juice costs 90 cents more than the empty bottle. How much does the empty bottle cost? The answer is not 10 cents.

*January 13, 2009*

**biology**

what oganic molecules provised structure for hair, nail, bones/cartilage

*January 9, 2009*

**Math**

I don't know :-)

*October 14, 2008*

**chemistry**

Sodium phosphate, Na3PO4, reacts with HCl to form H3PO4 and NaCl. How many liters of 0.1 M HCl are required to react with 0.1 mole of sodium phosphate?

*October 13, 2008*

**physics**

force=(mass)(acceleration) what is the acceleration?

*September 24, 2008*

**physics**

A 4.9 g bullet leaves the muzzle of a rifle with a speed of 332 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.85 m long barrel of the rifle?

*September 24, 2008*

**12th grade government/economics**

what is the period of dominance of federalists

*August 24, 2008*

**Precalculus**

Oh sorry, haha thank you for correcting me and thank you for helping me out.

*July 30, 2008*

**Precalculas**

how do i find the inverse of f(x)= (3x+7)/(x-2)

*July 30, 2008*

**Art**

Where does clay come from?

*April 17, 2008*

**Calculus**

x(squared)+8x+17 if x < or = -4 Let f(x)= 2 if x= -4 -x(squared)-8x-15 if x > -4 Show that f(x) has a removable discontinuity at x=–4 and determine what value for f(–4) would make f(x) continuous at x=–4. Must redefine f(–4)=____

*April 15, 2008*

**chemistry**

so Fe did that... im getting confused because i to oxidize means to lose electrons that makes it more positive and then reduction is actually the addition of electrons

*April 15, 2008*

**Calculus**

What is the limit as x approaches -1 of x - 5 --------------------- 4x(squared)-6x+ 3

*April 15, 2008*

**Calculus- limits**

never mind it was 12

*April 15, 2008*

**Calculus- limits**

f(x) = x + 7 if x < or equal to 5 F(x) = 7 if x >5 what is the limit as x is approaching 5 from the left side????? I know that the limit as x approaches to 2 does not exist and that the limit as x is approaching 5 from the right side is 7

*April 15, 2008*

**US history**

1. Which of the following justifications was not one of the proslavery arguments? a. Slavery offered a secure and certain life for slaves. b. Slavery involved only a very small number of slaves. c. Slavery assured an adequate labor supply for planters. d. Slavery influenced ...

*December 29, 2007*

**Magnets-Physics**

magnets attrac each other

*November 6, 2007*

**Economics**

Question on study guide that i don't get. Bill O’Really of OX News observed that poultry (chicken and turkey) consumption in the US increased dramatically over the 2000 to 2006 period. This he discovered was due to the fact that consumers, being more health conscious...

*September 4, 2007*

**Macro Econ**

Which of the following argues in favor of using Gross Domestic Product as a measure of economic well-being?

*July 24, 2007*

**pre-cal**

Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos 6x can be expressed as a series of terms that involve sin x or cos x only, but the end result is not a simplification. sin 2x = 2 sinx cosx cos 6x = 32 cos^6 x -48 cos^4 x + 18 cos^2 x - 1 I assume you are ...

*May 17, 2007*

**pre-cal**

find all solutions in interval [0,2pi] tan²x = -3/2 secx This question may look tricky, but its actually quite simple. First: rearrange the pythagorean identity tan²x+1=sin²x so that it reads tan²x=sin²x-1 Then replace the tan²x in the original ...

*May 16, 2007*

**pre-cal**

Find the EXACT VALUE of csc(-11pi/12) If that angle is in radians, it is easy. A full circle has 2PI radians...or 360 deg so 22PI/24 is the same as 22*15 deg, or -30 deg. The 30 deg triangle is well known. The sin is 1/2, so the csc is 2 Figure out the sign of the csc from ...

*May 16, 2007*

**algebra**

given two containers, one holding 4 gal. and the other holding 3 gal. how does one measure out two gal.? Fill the 3 gal, pour it in the 4 gal. Fill the 3 gal, then pout it int the 4 gal until filled. How much is left in the 3 gal? thank you bobpursley!!!!!!!!!!!

*April 26, 2007*

**Finance/Math**

1. Present Values. Compute the present value of a $100 cash flow for the following combinations of discount rates and times. a. r = 8 percent. t = 10 years b. r = 8 percent. t = 20 years c. r = 4 percent. t = 10 years d. r = 4 percent. t = 20 years 2. Future Values: Compute ...

*March 19, 2007*

**IS ANYONE IN THIS WEBSITE? I NEED HELP MATH H.W.**

The Answer is 34. Hint: try calculating two numbers at a time (ex. 59 minus 10= 49 then do 49 minus 15 = 34.

*December 23, 2006*

**English**

help me pls.. How the puritans were different from the people of the Revolutionary period? WHo coined the phrase "There are many times that try men's souls"? Who felt God was on the colonists' side and would help them win the war? the choices fo WHO questions...

*December 14, 2006*

**english**

i've just read "The Crisis" and i can't answer the questions.. i don tget it... 1. Which passages in the excerpt of "The Crisis" no. 1 were especially stirring? 2. The phamplet opens with two famous images. What kinds of people does paine identify ...

*December 3, 2006*