Friday

August 22, 2014

August 22, 2014

Total # Posts: 2,531

**physics another one**

A laser emitting light of wavelength 580 nm is incident on a diffraction grating. What is the maximum number of lines per centimeter for which the m=5 principal maximum will be visible
*October 4, 2010*

**Physics help I am stuck**

Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 1.81 m away. If the first-order maxima are separated by 1.40 m on the screen, what is the distance between the two second-order maxima?
*October 4, 2010*

**chemistry**

thanks anna. i figured it out thanx 2 u.
*October 3, 2010*

**Math**

add, simplify if possible. z+r/zr^2 + 8z+r/z^2r
*October 3, 2010*

**Math**

Find all numbers for which the rational expression is undefined. m^3-8m / m^2-25
*October 3, 2010*

**Math**

Find the LCM of this 6a^4c^9, 3a^3c^7, 14a^8c^7
*October 3, 2010*

**Math**

correction: 6a^4c^9, 3a^c^7,14a^8c^9
*October 3, 2010*

**Math**

Find the LCM of this 6^4c^9, 3a^3c^7, 14a^8c^7
*October 3, 2010*

**3rd grade**

i would say c.
*October 3, 2010*

**Math**

ok if i do this that is correct 2w-4/2w = 2(w-2)/2w = w-2/w
*October 3, 2010*

**Math**

Simplify by removing factors of 1 2w-4/2w
*October 3, 2010*

**English**

oranises is supposed to be "organizes" thought u should know.
*October 3, 2010*

**math**

it took 3 hours for patrol boat to travel 48km upstream and 2 hours to travel downstream. What is the current and boat speed.
*October 2, 2010*

**algebra**

In my text book because these are practice questions it says in the question that we assume the denominator is not equal to zero
*October 2, 2010*

**algebra**

Please help on this: ^ means exponent Simplify 48y^6z^0 ___________ -8y^6 z^2
*October 2, 2010*

**algebra**

Oh yes I forgot to add the choices are... z or -z or z over z-1 or z over z+1
*October 2, 2010*

**Physics**

delta x 1 = delta x 2 / (1/sqrt(1-v^2/c^2)) would this be the correct equation to use?
*October 1, 2010*

**Physics**

A Borg cube starship is zooming past Earth with a speed v=0.97c as shown. The cube has side lengths of 3.03 km. What is its volume, measured from Earth? Can someone step me through this problem?
*October 1, 2010*

**Physics**

Have you ever wondered what to do with your unused pet while on vacation? Do you feel bad about just dumping it in some airport pet kennel and showing up again four weeks later? Do you ever wonder how to keep your pet fresh longer instead of having it age uselessly? This is ...
*October 1, 2010*

**College Physics**

Have you ever wondered what to do with your unused pet while on vacation? Do you feel bad about just dumping it in some airport pet kennel and showing up again four weeks later? Do you ever wonder how to keep your pet fresh longer instead of having it age uselessly? This is ...
*October 1, 2010*

**Math, Please help :/**

wait but up to what number do i have to keep multiplying , like 30+.85* 2,3,4,5,6,7,8,9 - up to what number ??
*September 30, 2010*

**Math, Please help :/**

A list? but what has to go in the list?
*September 30, 2010*

**Math, Please help :/**

Okay . We should of coppied off the board when he had it today.. But whats the real answer ? 36 ?? Or 13??
*September 30, 2010*

**Math, Please help :/**

I know right. Um who do you know that would know the chart ?
*September 30, 2010*

**Math, Please help :/**

Hmm, well yesterday when i was on here someone told me that the answer was - $30 / $.85 = 35.3 or 36 videos. and i think thats right.. But idk . didnt he say we needed a chart ?
*September 30, 2010*

**Math, Please help :/**

Hmm that sounds right , But mr fuchs said that the equation was y=30 * 2.25x , So i dont know , This is confusin :/
*September 30, 2010*

**Math, Please help :/**

What are your formulas?
*September 30, 2010*

**Math, Please help :/**

I dont understand your answer, please explain more.
*September 30, 2010*

**Math, Please help :/**

At Mr.Vid's Video Rentals you can join his VId Club for a monthly membership fee pf $30. Club members pay only $.85 to rent each movie. If you are not a member of the VID club, the movies rent for $2.25 each.How many videos would you have to rent each month to make a ...
*September 30, 2010*

**Math**

At Mr.Vid's Rentals you can join his VID Club for a monthly membership fee of $30.Club members pay only $.85 to rent each movie. If you are not a member of the VID Club, the movies rent for $2.25 each.How many videos would you have to rent each month to make a membership ...
*September 29, 2010*

**Algebra**

Express the following in simplest radical form. All variables represent positive real numbers. square root of 80a^2b divided by the square root of7a^3b^7 I got an answer of 4 square root of 5 divided by b^3 square root of 7a
*September 29, 2010*

**us history**

i agree
*September 29, 2010*

**Chemistry (again)**

What mass of NaOH is required to precipitate all the Fe2+ ions from 52.0 mL of 0.200 M Fe(NO3)2 solution?
*September 28, 2010*

**Chemistry**

Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form 550 mL of solution. While we're at it... How many milliliters of 10.6 M HCl solution are needed to obtain 0.205 mol of HCl? Also... How many grams of solute are present in 50....
*September 28, 2010*

**math**

It isn't, LOL.
*September 28, 2010*

**math**

E = Elm, M = Maple, O = Oak M = 2E O = 5E O + M + E = 32 Now you just guess & check. Try using the number 8 somewhere; I'm not going to do ALL of it.
*September 28, 2010*

**9th grade MATH**

14 + 2y = 78 78 - 14 = 64 2y = 64 64 / 2 = 32 y = 32
*September 28, 2010*

**8th grade**

the study of the physical and natural world and phenomena, especially by using systematic observation and experiment
*September 28, 2010*

**GEOMETRY**

Not enough info. Sorry.
*September 28, 2010*

**College Physics**

i got 4.11 and it was wrong, also im not sure what units to use.
*September 28, 2010*

**Algebra**

Add and subtract the rational expressions as indicated. Be sure to express your answer in simplest form ((9)/(7x)) + ((1)/(2y)) -1 I got an aswer of (16y)/(7x+2y+1)) but when I submit it shows me as wrong. Can anyone help, thanks
*September 28, 2010*

**Chemistry**

Please help I am 11 and lost.y question is a piece of tungsten has a volume of 5.2cubic centimeters and and mass of 100 grams. What is the density of tungsten? I am in sped class don't understand how to solve it.
*September 27, 2010*

**chemistry**

DrBob222 I am 11 years old and in sped I don't understand your answer. Please give a little more detail.
*September 27, 2010*

**chemistry**

Tungsten is a dense metal that is used to make the filaments in incandescent light bulbs. A piece of tungsten has a volume of 5.2 cubic centimeters and a mass of 100 grams. What is the density of tungsten?
*September 27, 2010*

**physical science**

3 hours
*September 26, 2010*

**physical science**

a component or assembly of components that performs a specific function
*September 26, 2010*

**Random?**

good question. i have often wondered that my self
*September 26, 2010*

**Random?**

it gives the person encouragement and a sence of accomplishment
*September 26, 2010*

**Algebra**

Could someone help me with this question Simplify the rational expression. (3x^2y+9xy^2-12y^3)/(36x^3y-27x^2y^2-9xy^3)
*September 26, 2010*

**Algebra**

Could someone help me with this question Simplify the rational expression. (3x^2y+9xy^2-12y^3)/(36x^3y-27x^2y^2-9xy^3)
*September 26, 2010*

**Macroeconomics**

What are the key elements of the scientific method and how dose this method relate to economic principles and laws?
*September 26, 2010*

**English/General Knowledge**

What are some of the social issues in today's society? I'm supposed to make an Advocacy speech to effect positive changes on a social issue.
*September 26, 2010*

**earth science**

how did cultures throughout history attempt to explain events such as volcano eruptions, earthquakes, and ecipses?
*September 24, 2010*

**Algebra**

oh I see... but can u still simplify it further by taking -1?
*September 22, 2010*

**Algebra**

Simplify the rational expression. (45y-9xy)/(x^2y-25y) I got an answer of 9(5-9x)/((x-5)(x+5)) but it seems to be wrong. Can anyone solve this for me and see what they get? Thank you
*September 22, 2010*

**Algebra**

It still shows me as wrong when I submit online
*September 22, 2010*

**Algebra**

so will the final answer be 9(5-9x)/((x-5)(x+5)) ?
*September 22, 2010*

**Algebra**

sorry what I was suppose to write was 9y(5-9x)/y((x-5)(x+5)) do you see where there is still a mistake?
*September 22, 2010*

**Algebra**

I did that u get 9y(5-9x)/((x-5)(x+5)) but it is still wrong
*September 22, 2010*

**Algebra**

Simplify the rational expression. (45y-9xy)/(x^2y-25y) I got an answer of 9y/y(x+5) but it seems to be wrong. Can anyone solve this for me and see what they get? Thank you
*September 22, 2010*

**science**

Its stellar classification, based on spectral class, is G2V, and is informally designated a yellow star, because its visible radiation is most intense in the yellow-green portion of the spectrum.[13] In this spectral class label, G2 indicates its surface temperature of ...
*September 21, 2010*

**Math**

I tried using the formula there, but my answer seems wrong. I end up with the integral of radical x + a weird fraction, which doesn't seem to integrate well. Am I doing something wrong or is it just a complicated problem? Thanks for the help
*September 21, 2010*

**Math**

Find the area of the surface generated by revolving the curve y = (x + 3)^1/2, 2 ≤ x ≤ 4 about the x-axis.
*September 21, 2010*

**algebra**

pliis the equivalent form indicated for each of the following fractions 7/9=?/45 and 11/5=?/35 pliis help meee
*September 19, 2010*

**9th grade**

pliis the equivalent form indicated for each of the following fractions 7/9=?/45 and 11/5=?/35 pliis help meee
*September 19, 2010*

**College Chemistry**

a)What is the theoretical yield for this reaction under the given conditions? b)What is the percent yield for this reaction under the given conditions? 1.41gH2 is allowed to react with 10.4gN2,producing 2.46gNH3
*September 18, 2010*

**Chemistry**

I got 4.6102*10^-6 and it is wrong...Can you step me through the problem?
*September 18, 2010*

**physics**

two ropes are attached to a 200. kg sled. A 490. newton dog attached to on eo the ropes applies a force of 300. N b north of the rope. A 35.0 kg dog attached to the second rope applies a force of 125 N b 36.9 degrees south of west to the rope. Calculate the net force applies ...
*September 17, 2010*

**Algebra 2**

factor 5x^2-35+60
*September 16, 2010*

**HIS 125**

• Create a timeline of four to six significant events that occurred during World War II. o Include the following in your timeline: The year the event occurred The name and a short description of the event A short explanation of why the event was...
*September 15, 2010*

**math factoring**

5x^2-35+60
*September 15, 2010*

**chemistry**

labelled diagram of an experiment magnesium with oxygen
*September 13, 2010*

**4th grade**

What subject do you have to write about? If your teacher didn't give you one, pick a subject that you would like to write about :)
*September 11, 2010*

**fractured math definitions**

a chord
*September 8, 2010*

**physic basics**

Use the fact that the speed of light in a vacuum is about 3.00 x 10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1.7 hour(s). i converted 1.7 hours to secs but im stuck there and i dont know what to do for the rest of the problem
*September 8, 2010*

**English**

Some islands are of the coast of Californa. What is th sbject and prepositio in this sntence?
*September 8, 2010*

**science**

What is the latin greek word for single PLZ HELP ME !!!!!!
*September 7, 2010*

**bio II**

what is the "transforming factor" that alters pneumonia bacteria?
*September 7, 2010*

**math**

find c from the formula h=abc when h=40, a=2, b=5
*September 5, 2010*

**Chemistry**

A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.96 gallons of water. You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
*September 3, 2010*

**Algebra 2 Honor**

On one day the value of $1.00 U.S. was equivalent to 0.77 euro. On the same day $1.00 U.S. was equivalent to $1.24 Canadian. Write the function to represent the value of Canadian dollars euros. What is the value of the function for an input of 5 rounded to nearest cent, and ...
*September 3, 2010*

**7th grade**

What is the least common multiple of 35, 70, 140
*September 2, 2010*

**social studies**

Name two states that extend futher south than louisiana
*September 2, 2010*

**algebra**

how do you graph the function... f(x)=2^x over the interval -2 is less than or equal to x is less than or equal to 3. Help please! THANKS!
*September 2, 2010*

**algebra**

solve for r a+ar=b+r Help! Thank you.
*September 2, 2010*

**8th grade science**

science what is a control group
*August 31, 2010*

**pre algebra**

how do you complete this problem -4x+7=11
*August 31, 2010*

**CHEMISTRY**

umm DrBob222 i still dont understand wat u did.... lik is it possible for a step-by-step help?
*August 30, 2010*

**CHEMISTRY**

1. You have 88.8 mL of 2.50 M solution of Na2CrO4 (aq). You have 125 mL of a 2.50 M solution of AgNO3 (aq). Calculate the concetration of Na+ when the two solutions are added together. 2. You have 75.0 mL of 2.50 M solution of Na2CrO4 (aq). You have 125 mL of a 1.84 M solution...
*August 30, 2010*

**Physics**

Two non-parallel light rays initially converge to a single point on a screen. A rectangular block of glass is now placed somewhere in front of the screen, in the path of the light rays, so that the glass surface is parallel to the screen. Where is the new convergence point of ...
*August 30, 2010*

**Physics**

very narrow beam of white light is incident at 40.40° onto the top surface of a rectangular block of flint glass 11.8 cm thick. The indices of refraction of the glass for red and violet light are 1.637 and 1.671, respectively. Calculate the dispersion angle (i.e., the ...
*August 30, 2010*

**AP Physics**

A rock thrown straight up with a velocity of 30 m/s from the edge of a building just misses the building as it comes down. The rock is moving at 47 m/s when it strikes the ground. How tall was the building? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m.
*August 24, 2010*

**Confused-Math**

Your calculator gives an answer of x=1.1578074156, y=2E-13 when using ROOT or ZERO in the graphing mode. Give the coordinates of the x-intercept your calculator has given you to the nearest thousandth. <<< ? I have no idea how to solve these. Someone please explain ...
*August 22, 2010*

**math**

how do you find all real and non real solutions to these type of equations?: (x+3)^2 - 81=0 (x+1)(x-2)=18 THANKS!
*August 22, 2010*

**Math**

But how do you figure out T? Out of the multiple choice answer nothing is coming close to one of the answers these are the multiple choice answers A) $2116.98 B) $18.57 C) $1857 D) $1818.44
*August 19, 2010*

**Math**

Choose the one alternative that best completes the statement or answers the question. Solve the problem. Assume that simple interest is being calculated in each case. Round your answer to the nearest cent. Martin takes out a simple-interest loan at 7.5 %. After 6 months, the ...
*August 19, 2010*

**math**

5x2=10
*August 14, 2010*

**geometry**

the endpoints of a line segment graphed on a cartesian coordinate system a (-2,6) and (1,2). what are the aoordinates of the midpoint of the segment?
*August 12, 2010*

**Chemistry **

Calculate the cell potential for the electrochemical cell consisting of Ag metal in a 0.500 M AgNO3 solution and Fe metal in a 3.0 M Fe(NO3)3 solution.
*August 8, 2010*

**algebra**

The length of a rectangular field is 18 m longer than the width. The field is enclosed with fencing and divided into two parts with a fence parallel to the shorter sides. If 216 m of fencing are required, what are the dimensions of the outside rectangle?
*August 8, 2010*

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