Tuesday

January 17, 2017
Total # Posts: 840

**math**

The city is planning to install streetlights and wants five lights along a walkway of 60 yards. If there is a light at the beginning and at the end of the walkway and the lights are evenly spaced, what is the distance between each light

*August 29, 2011*

**Chemistry**

Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4 (g) ---> 2NO2 (g) Delta H rxn: 55.3 kJ At 298 K a reaction vessel initially containing .100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. -What percentage of N2O4 decomposes at 350 ...

*July 18, 2011*

**Chemistry**

Consider the rxn during the Haber Process: N2 + 3H2 ---> 2NH3 The equilibrium constant is 3.9 x 10^(5) at 300 K and 1.2 x 10^(-1) at 500 K. Find Delta H reaction and Delta S for reaction

*July 18, 2011*

**Chemistry**

How many grams of Ba(OH)2 must be added to 2.37L of water to make a saturated solution? I got 2.03 grams. Is this correct?

*July 17, 2011*

**chemistry**

Ok, I set up the ICE table and found that Ksp of Ni(OH)2 is 5.48x10E-16. 5.48x10E-16=4S3 S=5.16x10E-6 Molar Now when you said convert this to grams I'm confused because the problem gives to the amount of grams used. I appreciate the help.

*July 17, 2011*

**chemistry**

A student adds .137 grams of nickel(II) hydroxide powder to 10.0 L of distilled water at 25C with vigorous stirring. Did all of the powder dissolve? If not, how much powder remains undissolved? If so, how much more powder can be dissolved before a saturated solution is reached...

*July 17, 2011*

**science**

which of the following absorbs hear from the surroundings as it proceeds to completion? 1. CO(g)+1/2 O2 (g)=CO2 (g) 2.AL2O3(s)=2 Al(s) + 3/2 O2 (g) 3.SO3 (g) + 99.2kJ=S (s)+3/2 O2 (g) Hrxn = -283.0 kj (endothermic)

*June 29, 2011*

**math**

Determine the equation of joint variation. Then solve for the missing value. x varies directly with y and z. x = 400 when y = 8 and z = 10. Find x when y = 10 and z = 12.

*June 21, 2011*

**physics**

What amount of energy is used if 800 C of charge passing through a load with a potential difference of 120 v? answer is 9.6e+4

*May 26, 2011*

**physics**

I think it was a joke man.. throwing a "physics book off a cliff" because its physics.. aha..ha..?

*May 11, 2011*

**arithmetic**

Write the nth term of the following sequence in terms of the first term of the sequence. 10, 20, 40, . . .

*May 6, 2011*

**Chemistry**

Thanks Dr Bob! You da man!

*May 1, 2011*

**Chemistry**

Thanks Dr. Bob! Along those same lines. Which of the following compounds have more than one isomer? PtCl5NH3, Co(NH3)4Cl2, Pt(CO)2Cl2, Rb3[Cr(CN)6] Thanks!

*May 1, 2011*

**Chemistry**

Two isomers have the same formula but different structures: Co(H2O)5SCN, CO(H2O)5NCS. The 5's mean 5-H20's. Draw each of these structures and explain the difference between the two? I don't even know where to begin. I appreciate any kind of help at this point. Thanks!

*May 1, 2011*

**Chemistry**

What is the total energy transfer(in KJ) when 10.00 pounds of water vapor at 110 degrees C becomes ice at 253K? Assume that the specific gravity of water = 1.00. The answer I got was around 12,000 KJ. Is this correct?

*April 30, 2011*

**math**

I always thought it was funny how when your younger, they prohibit the use of calculators, only to make it so when you get into Algebra 2 and higher, you HAVE to have a calculator. Aha, just think that's amusing.

*April 28, 2011*

**Chemistry**

Also shouldn't there be another phase involving the Cs of ice where the ice is cooled down to the 253k?

*April 28, 2011*

**Chemistry**

In q1, did you mean to say (110-100)? I did it assuming that and after I added all the q values I got 13,759.78 KJ as my answer. Is that correct?

*April 28, 2011*

**Chemistry**

What is the total energy transfer(in KJ) when 10.00 pounds of water vapor at 110 degrees C becomes ice at 253K? Assume that the specific gravity of water = 1.00.

*April 28, 2011*

**Chemistry**

Yeah that's the same setup I have but I'm not sure once I divide 30800/8.314 if I take that number and multiply by the other side of the equation or if I'm supposed to FOIL it out with the temps in parenthesis? Thanks!

*April 27, 2011*

**Chemistry**

Thanks Dr. B, I know to use that equation but the math is the part that I'm stuck on.

*April 27, 2011*

**Chemistry**

The normal boiling point of benzene is 80 degree C and its heat of vaporizations is 30.8 kj/mol. What is its boiling point at the top of Pikes Peak where P=260 mmHg?

*April 27, 2011*

**science**

b. mountains

*April 27, 2011*

**Geometry**

The scale factor for two similar triangles is 4 : 3. The perimeter of the smaller triangle is 12. What is the perimeter of the larger triangle?

*April 27, 2011*

**physical Science**

Explain why a ceramic bowl will keep oatmeal hot longer than a stainless steel bowl?

*April 26, 2011*

**Sociology**

What do you think they are?

*April 3, 2011*

**Sociology**

Oh I am sorry!! I think It goes but I am not sure! 1. D 2. D 3. A 4. C 5. D

*April 3, 2011*

**Sociology**

I need help with these homework questions!! 1. if a young person aspiring to a career in environmental issues joins professional society he or she should be engaging in: a. primary group behavior b. cliques c. anticipatory socialization d. none of the above 2. the variable of ...

*April 3, 2011*

**Math**

What is the volume of a rectangular solid that measures 16 ft by 14 ft by 20 ft?

*March 31, 2011*

**Chemistry**

NF3 and PF5 are stable molecules. Write the electron-dot formulas for these molecules. On the basis of structural and bonding considerations, account for the fact that NF3 and PF5 are stable molecules but NF5 does not exist

*March 23, 2011*

**Algebra**

why is 5^0=1 Not understanding it. also can you explain when (-3)^n is positive and when it is negative.

*March 14, 2011*

**chem 1**

Using equation: 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O Question: How many molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?

*March 1, 2011*

**high school chem 1**

Equation: 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) question: What volume of NH3 is needed to react with 71.6 liters of oxygen?

*March 1, 2011*

**High School chem 1**

2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2) Question: How many molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?

*March 1, 2011*

**High school chem 1**

Hi I put the wrong equation up should read 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) Question then is what mass of H2O is produced from 350 liters of NH3?

*March 1, 2011*

**High school chem 1**

4NH3(g) + 5O2(g) -> 4NO(g) + 6H20(g) what mass of H2O can be produced from 350 liters of NH3?

*March 1, 2011*

**high school chem 1**

The above equation has the wrong question attached it should read: How many molecules of H2O is made from 9.21 x 10 (to 22nd power) molecules of H2SO4?

*March 1, 2011*

**high school chem 1**

2Fe(OH)3 + 3H2SO4 -> Fe2(SO4) + 6H2) How many molecules of H2O can be produced from 350 liters of NH3?

*March 1, 2011*

**math**

an experiment consists of rolling a fair die until it lands on two. What is the probability that it will land on at least two is

*February 28, 2011*

**geometry**

the angle of depression from d to f measures 10 degrees. if df equals 300m, find df. round to the nearest tenth.

*February 18, 2011*

**Lit/chem**

What is a acrostic for the element cesium

*February 15, 2011*

**physics!**

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...

*February 14, 2011*

**Diffeq**

(e^xy)cos(2x)+x(y)e^xy(cos2x)-(2x)(e^xy)sin2x

*February 11, 2011*

**math**

how do I work the problem d=3.5t

*February 10, 2011*

**Science**

A block of ice of mass M is pulled horizontally with a steady force P against a force of friction F I have to write an equation for the acceleration of the block.

*February 9, 2011*

**calculus**

Consider the function below. f(x) = 4x2 - 5x (a) Find f '(2). (b) Use the answer in part (a) to find an equation of the tangent line to the parabola y = 4x2 - 5x at the point (2, 6). y =

*February 3, 2011*

**English**

So basically one can interpret it as early understand/hint while the inklings can be interpreted as ink relating to writing pen and ink?

*January 28, 2011*

**English**

Early Inklings Short Essay by John Updike. The title, â€œEarly Inklingsâ€ is an example of a pun (a witty play on words that suggest a double meaning) . Explain the pun and the meaning of the title. I don't even know where to start... Also...

*January 28, 2011*

**MAth**

Find the critical numbers, increasing intervals, x-values where f has an inflection point, and where the graph is concave down from the equation f(x)=2x^4-3x^3-10x^2+20

*January 27, 2011*

**math - algebra**

Fran, Dan, and Stan have a total of 194 cards. Fran has 24 more than Dan, but 35 less than Stan. How many do each of them have? I don't know how to set this up. Thanks.

*January 25, 2011*

**MATH**

Dan, Fran, and Stan have 194 cards. Dan has 24 less than Fran, and Stan has 35 more than Fran. How many do each of them have?

*January 23, 2011*

**Math**

Yeah probably, I also don't remember if it was 20435 or 20425 exactly, but it was approximately that.

*January 20, 2011*

**Math**

okay, good, I think i did it right then (it was actually a question on my exam that I just completed, it was the only question I was unsure about)

*January 20, 2011*

**Math**

A university is doing a study to record the growth of mosquitos. There is originally 25 mosquitoes. The growth of the mosquitos is 0.03% every 7 days. How many days until there are 20 435 mosquitos? What I did was use the growth formula A=25(1+0.03)^t to figure out how many ...

*January 20, 2011*

**MATH**

The sides should be proportional if they are similar, thus, since AB corresponds with wx, and Ab is 24 while wx is 16, 24/16=1.5 . So ABCD is 1.5 times bigger than wxyz. the other side is 30, CD, is 1.5x bigger than yz, so find that and get the area by multiplying. or u can do...

*January 20, 2011*

**Chemistry**

Could someone help me with this question? A vinegar sample was analyzed and found to be 5.88% acetic acid by volume. The density of pure acetic acid is 1.409g/ml. What volume of 0.200 M NaOH would be required to titrate a 2 ml aliquot of this vinegar.

*January 16, 2011*

**Math/Trig**

Is the answer y = 21.15sin(pi/6 t + 3)+66.25?

*January 14, 2011*

**us history**

I know i'm a year late but you can talk about how the government subsidized loans and granted land to companies

*January 13, 2011*

**MATH**

yes thank you

*January 12, 2011*

**MATH**

If angle a =22.17 and angle b = 136.5 what is the measure of angle c? Can someone show me how to go about this

*January 12, 2011*

**math**

The oldest brother gets half a candy bar extra.

*January 11, 2011*

**math**

3 darts, 25+19+6=50

*January 11, 2011*

**math**

ABC=495. 495+459=954

*January 11, 2011*

**math**

Gina,thank You For your help. I'll Show my work next time. Thanks for your quick feedback.

*December 18, 2010*

**math**

I'm a different Tyler WATever

*December 18, 2010*

**math**

make up a list of data with the following landmarks: mode:15 minimum:5 median:10 Maximum:20 use at least 10 numbers describe a situation in which these data might actually occur

*December 18, 2010*

**science**

how much energy is required to obtain superheated steam at 115 degrees celcius from 25 grams of water at 10 degrees celcius?

*December 16, 2010*

**free enter**

true or false the assembly line uses a division of labor

*December 16, 2010*

**algebra**

Compute: 7!/6! x 3!2!/(8-1)! express answer as acommon fraction.

*December 16, 2010*

**algebra**

how many cubic feet are in the volume of a round swimming pool which is 16 feet in diameter and 4 feet deep throughout? express answer in terms of pi.

*December 16, 2010*

**algebra**

six people are going to be seated in a row of 8 chairs. how many different ways may they be seated?

*December 16, 2010*

**Algebra**

Four circles with centers A,B,C,and D are mutually tangent. The areas of circles A,B,C, and D are 25pi, 100pi, 16pi, and 225pi respectively. How many units are in the perimeter of quadrilateral ABCD?

*December 5, 2010*

**Algebra**

What is the largest perfect square that divides 64,800?

*December 2, 2010*

**Algebra**

Find the value of x such that the four-digit number x15x is divisible by 18.

*December 2, 2010*

**Grade 11 Physics**

Two kids are on a beach pulling an inner tube. One is pulling at a force of 45N[N] and the other one pulling at 60N[SW]. What is the net force? (I tried to do it by taking the 60N and making a right angled triangle with it, i got 42.43N north and west, then I tried to combine ...

*November 30, 2010*

**Chemistry**

Well definately the more levels you have, the bigger the radius will be. However, also, the more electrons you have in that level, the smaller the radius will become. This is because the force of attraction will become greater between the electrons and the protons. Thus, if ...

*November 30, 2010*

**physics**

F=qvB(sinθ) but sinθ=1 so we can ignore it. We have B =1.5T q=1.6x10^-19 We just need v from our Ke. Ke=1/2mv^2 v^2=2Ke/m Punch in 8.0x10^13J and look up the mass of a proton (1.672x10^27) and solve for v, which turns out to be 3.09x10^7. F=(1.6x10^-19)(3.09x10^7)(1....

*November 23, 2010*

**PHYSICS PLEASE HELP!!!**

Thank you Bob, but even after reading the article, I still don't understand how to obtain the parallel force acting on the block (question b). Can you expand perhaps?

*November 22, 2010*

**PHYSICS PLEASE HELP!!!**

Please someone have mercy this is a test grade and I have no idea what to do ! A force of 200 N is being exerted on a blocki, which has a mass of 10 kg and is on 30 degrees inclined plane. The force is acting up the plane and parallel to it. The coefficient of friction between...

*November 22, 2010*

**Math**

shrtlf wjeyte r

*November 17, 2010*

**english**

in the miracle worker what does it mean when helen touches her own cheeks

*November 16, 2010*

**physics**

if a 700-kg piano us lifted 4.0 meters in 14 seconds, how much power is developed

*November 15, 2010*

**physics**

if a 700-kg piano us lifted 4.0 meters in 14 seconds, how much power is developed

*November 15, 2010*

**English**

I wrote a paper on Beloved, now I am required to do a MLA Documented Research Paper on this topic. I am stuck on how to begin with a Thesis Statement (subject and predicate)

*November 14, 2010*

**math**

4160

*November 8, 2010*

**math**

416

*November 8, 2010*

**Calculus**

The demand function for a product is modeled by : p=10,000(1-(3/3+e^-0.001x) Find the price of the product if the quantity demanded is (a) x=1000 units and (b) x=1500 units. What is the limit of the price as x increases without bound?

*November 7, 2010*

**Calculus**

The demand function for a product is modeled by : p=10,000(1-(3/3+e^-0.001x) Find the price of the product if the quantity demanded is (a) x=1000 units and (b) x=1500 units. What is the limit of the price as x increases without bound?

*November 7, 2010*

**Physics**

how much work is required to lift a 98-N block of ice if A) it is lifted a vertical distance of 5-m.? B) you push the same block of ice up a 7-m long ramp using in acompare to the work required in b.? C) How does the work required in A compare to the work required in B.? D) ...

*November 7, 2010*

**math**

How does a Hawaiian Baritone laugh?

*October 27, 2010*

**Physics**

The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 20 m radius of curvature. What is the car's speed at the bottom of the dip?

*October 27, 2010*

**physics**

well,his horzontal speed is all he has at the peak, so vertical speed at launch is vi^2=32^2-29.8^2 solve for Vi Then for height, Vi^2=2*g*h solve for height

*October 23, 2010*

**physics**

An ice hockey puck slides along the ice at 12m/s. A hockey stick delivers an impulse of 4.0kg*m/s causing the puck to move off in the opposite direction with the same speed. What is mass of puck?

*October 17, 2010*

**Physics**

Weight is a force, and as described by Newton's Second Law, F=ma, where m=mass and a=acceleration. At sea level on Earth, the acceleration is 9.81m/s down, which is the pull of gravity. By taking the object up to the top of a high mountain, it will be less affected by the ...

*October 13, 2010*

**6th grade**

I need to know what is the answer to this __ is a set of beliefs, values, and practicest that a group of people share.

*October 8, 2010*

**Algebra 1**

25% of what is 28?

*October 7, 2010*

**geometry**

A, B, and C are collinear, AB = 5x - 19, and BC = 3x + 4. Find an expression for AC if B is between A and C.

*October 4, 2010*

**6th grade**

WHAT IS THE GREENHOUSE EFFECT???

*October 3, 2010*