Friday

September 30, 2016
Total # Posts: 1,755

**physics**

A 1210 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. The angle between the beam and the horizontal is 30 degrees upwards and the angle between the horizontal and ...

*June 28, 2010*

**physics**

your approach makes a lot of sense. thanks for your help!

*June 27, 2010*

**physics**

a 20 g bullet strikes a 0.7 kg block attached to a fixed horizontal spring whose spring costant is 5600 N/m and sets it into vibration with an amplitude of 25 cm. What was the speed of the bullet before impact if the two objects move together after impact?

*June 27, 2010*

**algerbra**

i cant solve this can someone help me. 19.6 + X^2/2 ={(.007852*X /.001285)^2}/2 i know the answer is 1.01 but how do i get that

*June 23, 2010*

**physics**

how fast does the level of water in a full 2m high, 10cm diameter tank reduces when a 4cm diameter hole is opened at the bottom?

*June 23, 2010*

**college physics**

how fast does the level of water in a full 2m high, 10cm diameter tank reduces when a 4cm diameter hole is opened at the bottom?

*June 22, 2010*

**college physics**

find the weight of a piece of wood with a density of .5 g/cm cubed. which when attached to a 5kg stone in water it will sink. the density of the stone is 3g/cm cubed

*June 22, 2010*

**Psychology**

Post Hypnotic suggestions are best represented by which of the following Cocercive statements commands new ideas for self improvement Criticisms

*June 16, 2010*

**Psychology**

Either nightmares, night terrors, daydreams, or archetypical dreams

*June 16, 2010*

**Psychology**

What are dreams that contain symbolic characters and appear surreal?

*June 16, 2010*

**health**

The primary goal of wellness is the ability to achieve A.freedom from disease. B.a multicultural view of health. C.the highest possible quality of life. D.greater control over lifestyle decisions.

*June 11, 2010*

**Science**

using filtration??

*June 11, 2010*

**college physics**

find the frictional force exerted on a 20kg block pulled slowly over a horizontal floor using a rope which makes a 30 degree angle over the horizontal. the pulling force is 100N??? i found the Fn to be 146 N what do i do from there?

*June 10, 2010*

**philosophy**

What are key differences between the ontological, teleological, and cosmological arguments? Identify the philosopher who you think best supports his or her argument. Explain your answer briefly.

*May 26, 2010*

**physics**

a sled is pulled at a velocity across a horizontal snow surface. if a force of 8.0x10 to the first power N is being applied to a sled rope at an angle of 53 degrees to the ground, what is the magnitude force of friction

*May 24, 2010*

**10th grade**

the circle is circumscribed by the pentagon as shown (not drawn to scale). If QZ=10, YX=9, XW=9, UW=17, and SU=10, find the perimeter of the pentagon.

*May 20, 2010*

**englsh 3**

we are doing conjuction and compound sentences in class, and i need help diagraming this sentence: Little Red Ridinghood and her mother packed her basket witk cookies for her grandma.

*May 19, 2010*

**Government**

Which of the following is not a long term trend marking the expansion of suffrage in the United States?

*May 19, 2010*

**5th grade math**

Thanks! It was hard when I wasnt thinking that way! Now, I am able to do the rest of my homework without any trouble! Thanks for explaining it!

*May 14, 2010*

**5th grade math**

I came up with the answer of 12. Common greatest factor is 12. hope I did it right!Thanks again!

*May 14, 2010*

**5th grade math**

My class is selling flowers. We want to arrange them so that they are all in equal rows with no row containing different types of plants. Using the numbers from the table provided, what is the largest # of plants we can put in each row? (Marigolds-48 pots, Pansies-24 pots, ...

*May 14, 2010*

**Math**

Oh that makes sense. I forgot to look at the largest common factor. Thank you, I was thinking it was every other and how many can fit onto a tray! Thank you! That may help me in my other problem as well!

*May 14, 2010*

**Math**

It is a story problem. Courtney has 27 chocolate chip cookies and 36 oatmeal raisin cookies. She needs to arrange them on trays. She doesnt want to combine either type of cookies and she wants the same number on each tray. What is the largest number of cookies she can hve on ...

*May 14, 2010*

**algebra**

solve x-5/x*x-54 -7x+8/x*x-3x-54 +x-2-x*x+12x+36

*May 13, 2010*

**algebra 2**

The volume ( v) of a gas in a container at a constant temperature varies inversely as the pressure (p). If the volume of a gas is 24 cubic centimeters when the pressure is 16 pounds, what is the volume under a pressure of 30 pounds?

*May 8, 2010*

**geometry**

A right cylinder has a radius of 3 and a height of 12. What is its surface area? If necessary, round your answer to two decimal places.

*May 4, 2010*

**college physics**

A typical wavelength of infrared radiation emitted by your body is 25 µm (2.5 multiplied by 10-5 m). What is the energy per photon of such radiation?

*April 26, 2010*

**chemistry**

use resonance theory to account for the fact that aniline(pKb 9.37) is a weaker base than cyclohexanamine(pKb 3.34)

*April 25, 2010*

**Chemistry**

1)Write the general equation used to determine the volume of stock required to make a given concentration of standard? Define any terms you used. ----use the 100ml flasks to create four serial dilutions of the stock 10,000uM nitrate solution that has been provided. Prepare ...

*April 23, 2010*

**chemical oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...

*April 23, 2010*

**chem 1p1**

An automobile tire at 22oC with an internal volume of 20.0L is filled with air to a total pressure of 30. psi(pounds per square inch). [1 atm = 14.696 lb/in2]. What is the amount in moles of air in the tire? If the air is mostly nitrogen, how many grams of it would be in the ...

*April 23, 2010*

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...

*April 22, 2010*

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...

*April 22, 2010*

**chemistry**

write the two half-reactions for the reduction of nitrate to nitrite using Cd2+

*April 22, 2010*

**home economics**

okay so i have these 4 questions that i have no clue about...i asked my mom and aunts but they dont make clothes so im stuck on these 4 question i would appreciate if you could please help me 7. You're sewing a child's nylon jacket. You notice the fabric frays easily. ...

*April 20, 2010*

**college**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

*April 11, 2010*

**statistics**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

*April 8, 2010*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5 please write out the eq for me

*April 7, 2010*

**physcis**

THIS WEBSITE IS SO SLOW. NO ONE EVER ANSWERS.

*April 6, 2010*

**English lit**

Have writers block. Need help with Julia Alvarez poem!? I have to write a 1000 word analysis of the Julia Alvarez poem "Ironing Their Clothes". I need help with a thesis. I have no idea what to write about! 1 year ago Additional Details With a hot glide up, then down...

*April 1, 2010*

**chemistry-please someone answer...i am clueless**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

*March 25, 2010*

**chemistry**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

*March 25, 2010*

**analytical chemistry**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

*March 24, 2010*

**college chem**

can you elaborate a little more on how to so it

*March 24, 2010*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5? can someone please help me with steps to get the answer

*March 24, 2010*

**college chem**

what are the numbers for Conjugate acid and conjugate base

*March 23, 2010*

**college chem**

how did u get that can you please explain the steps

*March 23, 2010*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5

*March 23, 2010*

**math**

Thank you the site was very helpful.

*March 23, 2010*

**math**

I really don't understand this question and I can't seem to be able to solve it. Can anyone help me? Write a composite number between 7 and 20.

*March 23, 2010*

**chemistry**

A certain reaction has a delta H= -75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the Activation energy of the forward reaction by 15 kJ. What is the activation energy of the reverse reaction in the presence of this same catalyst?

*March 22, 2010*

**Chemistry**

Could someone tell me how I would write out trimethylammonium butanoate's structure? I think the butanoate part is CH3CH2CH2-C=O but I don't know how to add the trimethylammonium part to it.

*March 20, 2010*

**trig**

how do i find the amplitude, period, phase shift of y=2 cos(-4t-(-4 pi/3))

*March 18, 2010*

**chemistry**

1.5 x 10(10) mL

*March 11, 2010*

**windows XP**

On a shared folder, Read permission allows a user to display folder names, filenames, file data, and attributes; run program files; and change folders within the shared folder. True or false?

*March 11, 2010*

**computer science **

a bank charges $10 per month plus the following check fees for a commercial checking account: $.10 each for fewer than 20 checks $.08 each for 20-39 checks $.06 each for 40-59 checks &.04 each for 60 or more checks write a program that asks for the number of checks written ...

*March 10, 2010*

**computer science **

write a program that asks for the starting time and minutes of the call, and displays the charges. the program should ask for the time to be entered as a floating-point number in the form HH.MM. for example, 07:00 hours will be entered as 07.00, and 16:28 hours will be entered...

*March 10, 2010*

**college chem**

. Jack Daniels Tennessee whiskey is 40.00% ethanol by volume. However, % alcohol by mass is quite different from % by volume. The molality of ethanol in an aqueous solution that is 40.00 % ethanol by volume is 10.88 molal. A) Find the % ethanol by MASS, based on the molality. ...

*March 9, 2010*

**college chem**

N2O4 --->2NO2 a 1 liter flask is charged with .4 mols of N2O4. at equilibrium at 373 k, .0055 mols of N2O4 remain. what is the Kc for this reaction? please explain to me how to get the rate law for this and solving

*March 9, 2010*

**math**

OH,,, well i found out what i needed.. THANKS FOR YOUR HELP SO FAR!!!! :)

*March 8, 2010*

**math**

ya but where did you get the 4x? SORRY!

*March 8, 2010*

**math**

how did you get that answer from the question renee posted

*March 8, 2010*

**math**

If the team wins, (A) Then the team remains in the playoffs. (B) If the team stays in the playoffs (B) then the championship is within reach. (c) Therefore, if the team wins, (A) the championship is within reach.(c) It is not logically correct because The A's, C's, and...

*March 8, 2010*

**college chem**

why is PCl5 .1 -.o5 thats what i dont understand i know its .1 bec of the molar but why minus .05 shouldnt it be something close to .1

*March 7, 2010*

**college chem**

how did u get that equation

*March 7, 2010*

**college chem**

In the reaction PCl5(g) ---> PCl3(g) + Cl2 (g) 0.200 mol of PCl5 is introduced into a 2.00 liter vessel. At equilibrium, the concentration of Cl2 is found to be 0.0500 molar. Find Kc for the reaction.

*March 7, 2010*

**Math**

Solve each formula for N r/n + 2 = p t=100 (n+3) pv/nr = T 8a + 2n + 6b

*March 7, 2010*

**Math**

t=100 (n +3) PV/NR= T 8a + 2n = 6b r/n + 2 = p

*March 7, 2010*

**Math**

y=3x+2

*March 7, 2010*

**calculus**

Give the volume of the solid generated by revolving the region bounded by the graph of y=ln(x), the x-axis, the lines x=1 and x=e, about the y-axis

*March 4, 2010*

**math**

x+9y=18 find slope

*March 3, 2010*

**english**

u guys are horrible

*March 2, 2010*

**art**

What is the main difference from da Vinci's Last Supper and Andrea del Castagno's Last Supper?

*March 2, 2010*

**algerbra**

you helped me with this chem ques and you got close to 1 how did u get it please help me?You end up with a cubic equation for x. You may have to solve it graphically. Take the root that is between 0 and 1. As x -> 1, the term on the left approaches 4/[(0.5)(2-2x)^2 ] = 2.27...

*March 1, 2010*

**algerbra**

4x^2/[(1.5-x)(2.0-2x)^2] = = 2.72 x 10^11 solve for x

*March 1, 2010*

**question**

is kung fu a sport?

*March 1, 2010*

**algerbra**

4x^2/[(1.5-x)(2.0-2x)^2] = = 2.72 x 10^11 solve for x

*February 28, 2010*

**maths PLEASE HELP**

write x^2-11/5 log(2 x-1)+11/5 log(x-2)+ c as a single log im not sure how to change the brackets

*February 28, 2010*

**math**

4x^2/[(1.5-x)(2.0-2x)^2] = = 2.72 x 10^11 solve for x

*February 28, 2010*

**art**

can you change the relationship between object and background by changing their colors? what happens

*February 27, 2010*

**college chem**

At 750°C, the Kp for the reaction 2 CO + O2➞ 2 CO2 is 2.72 x 10^11. ( 2.72 times ten to the eleventh) At that temperature, CO and O2 are added to a constant volume vessel. The initial pressure of the CO is 2.00 atm, and that of the O2 is 1.50 atm. Calculate the ...

*February 27, 2010*

**college chem**

do you have to use limiting reagent for this problem

*February 26, 2010*

**college chem**

At 750°C, the Kp for the reaction 2 CO + O2➞ 2 CO2 is 2.72 x 10^11. ( 2.72 times ten to the eleventh) At that temperature, CO and O2 are added to a constant volume vessel. The initial pressure of the CO is 2.00 atm, and that of the O2 is 1.50 atm. Calculate the ...

*February 26, 2010*

**Chemistry**

Gold crystallizes in a face centered cubic structure. Using only a periodic table for refrence, determine the edge length of a gold unit cell. Show all Work.

*February 21, 2010*

**Chemistry**

Order the following solids according to increasing lattice energy. HgI2, CdCl2, ZnCl2 Now I get how to sort of do it, but I do not get how to do it if I'm looking at its radius if they do not provide it in the question.

*February 21, 2010*

**Chem**

Carbonic acid is a diprotic acid that ionizes in two stages. Write the two equations for the successive ionizations of carbonic acid in water.

*February 21, 2010*

**Chemistry**

Using the balanced reaction, enter the formula, charge(if any), and state of the species (exclude H2O) in solution if ZnCl2(aq) reactant is present in stoichiometric excess. Separate your answers by comma. ZnCl2(aq) + K2CO3(aq) → ZnCO3(s) + 2KCl(aq)

*February 18, 2010*

**algebra**

(8/125)^-(2/3)

*February 16, 2010*

**Chemistry**

Based on the balanced equation 2NBr3 + 3NaOH → N2 + 3NaBr + 3HOBr calculate the number of NaBr formula units formed when 126 NBr3 molecules and 192 NaOH formula units react?

*February 15, 2010*

**math**

simplify 8{[4(q-4)+16]-[2(5q-3)+3]}

*February 11, 2010*

**math**

simplify 8{[4(q-4)+16]-[2(5q-3)+3]}

*February 11, 2010*

**Chemistry**

thats wrong. dont listen to him

*February 8, 2010*

**math 4th grade**

2+7=9 7+2=9 1+8=9 8+1=9 3+5+1=9 5+1+3=9

*February 7, 2010*

**statistics**

What is the value of the z-scores if the area of the curve to this point is 0.887? How much of this are is between the peak of the curve and this point?

*February 1, 2010*

**Environmental Science**

I am guessing you have Lincoln Interactive?

*February 1, 2010*

**Math**

Simplify 2/7(-7x^2) what are the steps involved? thanks alot!

*January 27, 2010*

**chemistry**

Is hexane and ethylene chloride miscible? Why?

*January 27, 2010*

**math**

how do I solve : -4/ x+4 = -3/x+6?

*January 26, 2010*

**Math**

I posted this problem the other day and someone answered it but when I checked my book I realized that I wrote the problem wrong. This morning when I posted I had put the wrong answer. The answer is suppose to be 1/8 but I don't understand how to solve the problem. Help ...

*January 23, 2010*