Saturday

April 30, 2016
Total # Posts: 1,524

**Chemistry**

What are the concentrations of acetic acid (pKa = 4.76) and acetate in a buffer solution of 0.15 M at pH 4.5? Please help me do this problem. I have no idea how to do it.
*April 27, 2016*

**Math**

Four digit decimal between 10 and 20 my tenths digit is twice my tens digit sum of my tenths and my ones digit equals my hundredth digit the sum of all my digits is 11
*April 25, 2016*

**Maths**

Find the coefficient of x^7y^4 in the binomial expansion of (1/4*x -16y)^11 so far i have 11Ck(1/4 x)^11-k (-16y)^k=11Ck*(1/4)^11-k *x^11-k *(-16)^k * y^k
*April 21, 2016*

**maths**

A library opens with a collection of 300 books. During the first week after the opening, an additional ten books are donated to the library’s collection. In each subsequent week, six more books are donated to the library’s collection than were donated in the previous...
*April 21, 2016*

**Pre Algebra**

Kelsey is right, I got 100% on the multiple choice! ur a lifesaver!!!
*April 20, 2016*

**Maths**

Solve z^5 =-1 with the solutions in polar form. I've solved the equation z^5 =1, which I have Letz=r(cosθ+isinθ). Also,1=cos0+isin0. Sotheequationis (r(cosθ+isinθ))5 =cos0+isin0. how would i go about it with the negative 1 though?
*April 20, 2016*

**Science**

The opening to the tracheal system (respiratory system) in insects is the spiracle. trachea. alveolus. bronchus. stomata.
*April 13, 2016*

**Chemistry**

A 21.7 mL sample of 0.18 M KOH solution required 26.3 mL of aqueous acetic acid solu- tion in a titration experiment. Calculate the molarity of the acetic acid solution.
*April 12, 2016*

**Nazi related S.S**

I didn't know the Jehovah's witnesses were the only group that could of escaped just by resigning their religion or join the army.
*April 10, 2016*

**Nazi related S.S**

and I will
*April 10, 2016*

**Nazi related S.S**

thank you soo much Im doing this for a research for the holocaust
*April 10, 2016*

**Nazi related S.S**

What would happen if one of the German soldiers would turn against Hitler? just need a site or an explanation please thanks,
*April 10, 2016*

**HELP PHYSICS!! WORK**

How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6?
*April 10, 2016*

**Chemistry**

A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.03 nm. It then gives off a photon having a wavelength of 1005 nm. What is the final state of the hydrogen atom? What is the equation to solve this?
*April 7, 2016*

**English**

Answer
*April 7, 2016*

**Chemistry**

What is the [H3O+] of a solution if its pH = 8.26?
*April 7, 2016*

**HISTORY**

hello
*March 31, 2016*

**His**

4. The United States cut off sales of oil to Japan after the A. Japanese occupation of southern Indochina. B. Japanese occupation of Hong Kong. i chose B please can you check my answer
*March 31, 2016*

**HISTORY**

5. Regarding the Ottoman territories during the period immediately following World War I, which of the following statements is false? A. In 1919, Mustafa Kemal began organizing Turkish resistance. B. In 1921, Greek forces advanced almost to Ankara. C. Defying Allied pressure, ...
*March 31, 2016*

**Calculus**

Using a linear approximation or differentials, approximate:(26.98)^(3/4) thank you for your help!
*March 13, 2016*

**science**

Can you be more specific with your question? It would clear things up :)
*March 10, 2016*

**Science**

1. B 2. A 3. C 4. A
*March 9, 2016*

**Math**

Nevermind I answered it
*March 8, 2016*

**Math**

A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.
*March 8, 2016*

**math **

find the angle between u(-1,4) and V(3,-4)
*March 4, 2016*

**math**

using DeMoivre's theorem solve (-3,+3i)^4
*March 4, 2016*

**Art**

Thank you KillJoy :D
*February 29, 2016*

**physics 12U**

A driver parks his car on a hill but accidently leaves it in neutral. The car starts from rest and accelerates down the 45 m long hill. It take the car 12.3 seconds to reach the bottom of the hill. a) What is the final velocity of the car at the bottom of the hill? (ANS: 7.3 m...
*February 21, 2016*

**Algebra**

My question is: b-3= -4 A.) 7 B.) 1 C.)-1 D.)-7** I think it may be D.). I would just like someone to check my answer.
*February 16, 2016*

**chemistry**

when 130.4 mL of 0.459 mol/L silver nitrate solution is mixed with 85.23mL of 0.251 mol/L aluminum chloride solution, a precipitate of silver chloride forms. Find the mass of this Precipitate.
*February 15, 2016*

**Chemistry**

estimate the heat of vaporization of water if the vapor pressure is 17.54 torr at 20C and 149.4 torr at 60C. R=8.314 J/mole K. I can't remember how to set up the problem. Would someone be able to send me the formula? Thank you
*February 15, 2016*

**Maths**

The vector v has magnitude 17 and makes an angle of 105 with the positive x direction. Express v in terms of components, with i and j being unit vectors pointing in the positive x and y directions.
*February 14, 2016*

**physical science**

Umm, I think I know the answer, give me a second.
*February 9, 2016*

**statistic in probability**

Can you say word for word on what the question is so that I can help you answer it?
*February 9, 2016*

**statistic in probability**

Is the add 12 minutes long?
*February 9, 2016*

**science**

Well, which ever it is it's probably most likely 100m minus 35m or it's 100m plus 35m... (sorry that I can't help much)
*February 9, 2016*

**science**

Is it asking you for the distance from the starting point to where you ended up? (100m - 35m) Or is it asking you for the entire amount that you walked? (100m + 35m)
*February 9, 2016*

**Chemistry**

Two fixed charges, -4μC and -5μC, are separated by a certain distance. If the charges are separated by 20cm, what is the magnitude of the electric field halfway between the charges? My textbook says that the formula for electric field is (kq)/r^2. But Since I have ...
*February 9, 2016*

**civic**

ten factor that protect human rights
*February 9, 2016*

**History**

Thank You so much for your help
*February 8, 2016*

**History**

How did the Ming officials manage government when emperors were incompetent? How did this ultimately contribute to the Ming’s decline? Please help me I'm suck on this
*February 8, 2016*

**history**

How did the Ming officials manage government when emperors were incompetent? How did this ultimately contribute to the Ming’s decline?
*February 8, 2016*

**history**

How did this ultimately contribute to the Ming decline? please help me i'm suck on this
*February 8, 2016*

**physics**

A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics
*February 7, 2016*

**physics**

A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics
*February 7, 2016*

**Physics PLEASE PLEASE HELP! CONFUSED **

I am so lost and confused right now with this question. I might have a quiz. Help me understand before this pop quiz!!!! THANKYOU A diver runs horizontally with a speed of 1.2 m/s off a platform that is 10.0 meters above the water. a) how long before the diver hits the water? ...
*February 3, 2016*

**True & False explanations Physics **

When a projectile is fired at 45 deg. angle and is in free fall, the only point along the path that the acceleration of the object is zero is the instant when the object is at the highest point of its path. Answer: False Can someone explain how? 2.) An object with acceleration...
*February 3, 2016*

**physics**

I don't understand. derive a general equation that will predict the horizontal range of a projectile that is fired from one vertical position and ends at any other vertical position with an initial velocity, V1, at an angle, pheta, from the horizontal. The equation should ...
*February 3, 2016*

**Elementary Math**

correct.It can be 6/10
*February 1, 2016*

**Pre Algebra**

how do you find the slope?
*January 29, 2016*

**Math**

Assign a variable to the number of eggs Mia has, say mm. Then, because we are given that Sofia has twice the number of eggs Mia has, Sofia has 2m2m eggs, and Pablo, having three times the number of eggs as Sofia, has 6m6m eggs. For them to all have the same number of eggs, ...
*January 28, 2016*

**Math**

Okay, thanks
*January 28, 2016*

**Math**

I tried again with another question: What percent of 62 is 58? Use the percent equation (which is part=percent times whole) 58=62x Divide 62 on both sides. I rounded to the nearest tenth and got 93.6%
*January 28, 2016*

**Math**

Thank you!
*January 28, 2016*

**Math**

Okay
*January 28, 2016*

**Math**

So when you round it, you get .01 %, right?
*January 28, 2016*

**Math**

Thanks
*January 28, 2016*

**Math**

What percent of 88 is 33? Solve using Percent equation. I solved for x in the equation 33=88x and I got 0.4. Did I do it right?
*January 28, 2016*

**Math**

Find the unit rate then multiply by 31 on both sides of the ratio
*January 28, 2016*

**Chemistry**

A student has placed a mixture of CaO and CaO, 4.88 g of dough into a flask containing 1.46 L of carbon dioxide at 35 ° C and 746 mmHg. After completing the reactions, it found that CO2 pressure had decreased to 353 mmHg.Calcule the percentage composition of the mixture
*January 28, 2016*

**Science**

A 0.44 kg mass at the end of a horizontal spring is displaced 1.5 m and released, then moves in SHM at the end of the spring of force constant 2 N/m. Find the potential energy of the system when the spring is stretched 0.9 m. The acceleration of gravity is 9.8 m/s2 . Answer in...
*January 22, 2016*

**Science**

A 0.44 kg mass at the end of a horizontal spring is displaced 1.5 m and released, then moves in SHM at the end of the spring of force constant 2 N/m. Find the potential energy of the system when the spring is stretched 0.9 m. The acceleration of gravity is 9.8 m/s2 . Answer in...
*January 22, 2016*

**Physics**

An automobile having a mass of 1220 kg is driven into a brick wall in a safety test. The bumper behaves like a spring of constant 2.42 × 106 N/m and compresses 2.99 cm as the car is brought to rest. What was the speed of the car before im- pact, assuming no energy was ...
*January 22, 2016*

**Chemistry**

thanks DrBob222
*January 20, 2016*

**Chemistry**

What volume of air at 1.0 atm and 25 degree Celsius must be taken to an engine to burn 1 gallon of gasoline? Assuming that: 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O provides reasonable model of the actual combustion process. ( The partial pressure of oxygen in air is 0.21 atm ...
*January 20, 2016*

**Chemistry**

What volume of air at 1.0 atm and 25 degree Celsius must be taken to an engine to burn 1 gallon of gasoline? Assuming that: 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O provides reasonable model of the actual combustion process. ( The partial pressure of oxygen in air is 0.21 atm ...
*January 20, 2016*

**Help With Art Please**

Yep, “yes” is correct I got 3/3 thank you
*January 15, 2016*

**Maths**

Can anyone help. What is the rule of the following function? (9-2x)/(5-x)
*January 14, 2016*

**math**

Five eights of Johns money is €367.50 .How much money has John? WAITING for a QUICK answer!!!!!!!
*January 11, 2016*

**Geometry**

In parallelograms TUVW, part of a ceramic tile pattern, angle TUV = (8x + 1) and angle UVW = (12x + 19) find angle TUV
*January 7, 2016*

**Geometry**

I got it thank you :)
*January 7, 2016*

**Geometry**

Yes it is
*January 7, 2016*

**Geometry**

Three interior angles of a convex heptagon measure 125 degrees, and two of the interior angles measure 143 degrees. Which are possible measures for the other two interior angles of the heptagon? 1: 48 and 48 degrees 2: 39 and 100 degrees 3: 100 and 116 degrees 4: 89 and 150 ...
*January 7, 2016*

**Math**

the terminal side of an angle in standard position coincides with the line x-2y=0, what is the cosine to the nearest ten-thousandth??? I am completely lost with this one
*January 6, 2016*

**Math**

the terminal side of an angle in standard position coincides with the line x-2y=0 in quadrant 3, find cosine theta to the nearest ten-thousandth
*January 6, 2016*

**Math**

You would multiply denominator and the whole number then add that product to the numerator. You would then get an improper fraction and divide the numerator from the denominator to get a rational number.
*January 5, 2016*

**English**

The school did, its in our English book but it isn't opening the book, it just goes to a plain white screen so I think the site is just down since its still winter break. Thank you though, I'll try to go to the library to get it :)
*December 31, 2015*

**English**

I have to read the book 'Nethergrave' by Gloria Skurzynski, but the online book doesn't seem to want to open on either of my computers so I assume the site is down. Does anyone know where I could find the book somewhere else online, I've been searching google ...
*December 31, 2015*

**AP LANG**

Any nonfiction book recommendations about language as a key to identity?
*December 28, 2015*

**English**

I've already went through a few pages but the definition my lesson gave me was different than the ones that are mentioned in the ones I saw. I have that it means 'the philosophy that the actions of a person are predetermined by factors outside of him or her' but ...
*December 26, 2015*

**English**

I am writing a paper for The Red Badge of Courage and it says to talk about naturalism and where it was represented in the book and I'm having a bit of trouble. I understand what naturalism is and everything, I just can't find an example from the book where it was ...
*December 26, 2015*

**physics Hello?**

anyone strong in physics, help would be awesome
*December 20, 2015*

**physics**

M1.) Nguyen jumps off a cliff with a height of 100 meters at a velocity of 3.5 meters per second to a save a cat. How long will it take her to reach the surface of the ocean? A3.) A plane vertically flees a horde of zombies at a speed of 7.9 m/s at a height of 230m above the ...
*December 20, 2015*

**Physics! I just need confirmation on my answer. Is this correct? **

So is T= 2.03 and is the Distance/ Final velocity= 60.9 m/s ??? So to answer the question: How far away should the truck be when he jumps in order for him to land in the bed?... So.. the answer in terms of how far away the truck should be is 60.9 meters/ second away it is?
*December 17, 2015*

**Physics!**

INITIAL POSITION x1= 10m FINAL POSITION x2= 0 m INITIAL VELOCITY v1= 5 m/s FINAL VELOCITY v2=? ACCELERATION a= -9.8 m/s^2 TIME t=? Are these numbers put in the proper place? I'm confused on this part before I get towards the end..
*December 17, 2015*

**Physics!**

A person is standing on a 10-m bridge above a road. He wants to jump from the bridge and land in the bed of a truck that is approaching him at 30 m/s. In order to clear the bridge railing, he has to jump upward initially with a speed of 5 m/s. How far away should the truck be ...
*December 17, 2015*

**PHYSICS! Really Confused! Test Tmrw**

I have to submit before 6 pm 12/17/15. I am super confused and I have another test. Someone help show the steps and simplify what to do. Much appreciated!!
*December 17, 2015*

**PHYSICS! Really Confused! Test Tmrw**

A person is standing on a 10-m bridge above a road. He wants to jump from the bridge and land in the bed of a truck that is approaching him at 30 m/s. In order to clear the bridge railing, he has to jump upward initially with a speed of 5 m/s. HOW FAR AWAY SHOULD THE TRUCK BE ...
*December 17, 2015*

**Physics**

John, Can you or any others help in my recent question I posted around 4pm?? Here is the question but go to my actual question I posted.... A person is standing on a 10-m bridge above a road. He wants to jump from the bridge and land in the bed of a truck that is approaching ...
*December 17, 2015*

**Physics**

Hey Steve, can you also help my question too? I am Very confused at even how to approach the question.
*December 17, 2015*

**English**

I'm writing about how wedding cakes are high art, so I want to connect how there are tv shows about art competitions and there are tv shows on cake competitions.
*December 16, 2015*

**English**

How can I connect competition and acknowledgement/recognition?
*December 16, 2015*

**English**

Yep :)
*December 14, 2015*

**English**

I'm leaning more towards C. There's nothing in the passage to support A. But C it's giving a comparison to why we should preserve these animals.
*December 14, 2015*

**Art**

You're expressing yourself in ways you wouldn't normally do.
*December 14, 2015*

**physicsHELP!!!!**

HELP!!!
*December 12, 2015*

**physicsHelp!!!**

so what do I put into the equation : vf^2=vi^2+2ad solve for a. I'm confused on the question how many g's ? g=9.80 m/s^2 so wouldn't dividing by 9.8 make the how many g's =0 ZERO?
*December 12, 2015*

**physicsHELPPLEASE!**

I really don't understand how to begin with this question. Struggling at the moment. Any help would be much appreciated!!!!
*December 12, 2015*

**physics **

2.) A sports car is advertised to be able to stop in a distance of 50m from a speed of 90 km/h. What is its acceleration in m/s^2? How many g's is this (g=9.80 m/s^2)
*December 12, 2015*

**Physics**

Using proper formulas, how do you go about with this question... really confused 1.) A sprinter accelerates from rest to 10.0m/s in 1.35s. What is her acceleration (a) in m/s^2 and (b) in km/h^2? 2.) A sports car is advertised to be able to stop in a distance of 50m from a ...
*December 12, 2015*