Monday

November 30, 2015
Total # Posts: 52

**precalc**

solve. give the answers so that 0 ≤ x < 2π. 1) sin x + 4 = 5 csc x answer: π/2 2) 3 csc x + 15 = 0 answer: -.20 are my answers correct?
*October 29, 2015*

**precalc**

is the answer to #3 39°?
*October 29, 2015*

**precalc**

Solve. Give the answers in degrees so that 0° ≤ θ < 360°. 1) (5 cos θ - 1) / 2 = 1 answers: 53°, 127°, 233° 2) 3 cot (2θ) + 3 = 0 3) tan^2 θ + 2 sec^2 θ = 3 is my answer for #1 correct and i'm not sure how to do #2 and #3.
*October 29, 2015*

**CHEMISTRY !!!**

What is the pH of a 0.16M KHSO3 solution at 298 K? a. 4.41 b. 1.31 c. 7.00 d. 1.82 e. 3.89 I did the calculations and my answer came out to be 3.89 but apparently the answer is 4.41. Can anybody explain why ? Thnx in advance
*October 3, 2015*

**science**

It's a reaction between two elements, so it's chemical.
*September 27, 2015*

**Chemistry**

Use dimensional analysis. You have the rate at which the water drops and you a set time figure out how to implement them in your calculation. And did you by any chance mean milliliter* not millimeter ?
*September 27, 2015*

**CHEMISTRY**

You have 875 mL of an 0.53 M acetic acid solution. What volume (V) of 1.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.94? (The pKa of acetic acid is 4.76.)
*September 27, 2015*

**CHEMISTRY**

A 70.0 mL solution of 0.165 M potassium alaninate (H2NC2H5CO2K) is titrated with 0.165 M HCl. The pKa values for the amino acid alanine are 2.344 (pKa1) and 9.868 (pKa2), which correspond to the carboxylic acid and amino groups, respectively. Calculate pH of second equivalence...
*September 27, 2015*

**CHEMISTRY !!! HELP !**

A 70.0 mL solution of 0.165 M potassium alaninate (H2NC2H5CO2K) is titrated with 0.165 M HCl. The pKa values for the amino acid alanine are 2.344 (pKa1) and 9.868 (pKa2), which correspond to the carboxylic acid and amino groups, respectively. Calculate pH of second equivalence...
*September 26, 2015*

**CHEMISTRY !!! HELP !**

You have 875 mL of an 0.53 M acetic acid solution. What volume (V) of 1.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.94? (The pKa of acetic acid is 4.76.)
*September 26, 2015*

**CHEMISTRY !!! HELP !**

Nevermind, I figured out what I was doing wrong. Thnx
*September 26, 2015*

**CHEMISTRY !!! HELP !**

Calculate the pH of the solution after the addition of the following amounts of 0.0617 M HNO3 to a 70.0 mL solution of 0.0750 M aziridine. The pKa of aziridinium is 8.04. 1)Volume of HNO3 equal to the equivalence point 2)89.5mL of HNO3 I got pH= 7.37 for 1 but i believe I ...
*September 26, 2015*

**CHEMISTRY !!! HELP !**

OHH Great !!! It makes much more sense now.Thanks !
*September 24, 2015*

**CHEMISTRY !!! HELP !**

.5*.12=.06 mols NaOH .595*.25=.14875 mols Acid (.14875)/(1.095)=.1358M Acid (.06/1.095)=.05479M NaOH pH=4.53+log(base/acid)=4.14
*September 24, 2015*

**CHEMISTRY !!! HELP !**

500.0 mL of 0.120 M NaOH is added to 595 mL of 0.250 M weak acid (Ka = 2.95 × 10-5). What is the pH of the resulting buffer? The answer that i got using HH equation is 4.14 but apparently it's wrong. Am I approaching this problem from a different angle ?
*September 24, 2015*

**Math**

You just divide the total money paid by 13.50 which is the amount paid per ft^2 and that will be your area.
*September 20, 2015*

**Chemistry ! Need help.**

A buffer prepared by dissolving oxalic acid dihydrate (H2C2O4·2H2O) and disodium oxalate (Na2C2O4) in 1.00 L of water has a pH of 5.007. How many grams of oxalic acid dihydrate (MW = 126.07 g/mol) and disodium oxalate (MW = 133.99 g/mol) were required to prepare this ...
*September 20, 2015*

**math**

In order to estimate the height 'h' of a tall pine tree, a student places a mirror on the ground and stands where she can see the top of the tree. The student is 6 feet tall and stands 3 feet from the mirror which is 11 feet from the base of the tree. Another student ...
*February 12, 2015*

**phsics**

A ball is rotating in a horizontal circle at the end of a string of length 3.8 m at an angular velocity of 8.5 rad/s. The string is gradually shortened to 3.3 m without any force being exerted in the direction of the ball’s motion. Find the new angular velocity of the ...
*November 19, 2014*

**Algebra Help! Please**

4x-2=4x-2 0=0
*November 19, 2014*

**Science--PLEASE CHECK!**

I would say that the answer is b, although I'm not quite sure..
*May 7, 2014*

**math 3**

24000 cu cm
*March 5, 2014*

**Physics**

A 6 uF capacitor is initially charged to 100V and then connected across a 600 ohm resistor. a) what is the initial charge on the capacitor?
*March 3, 2013*

**Science**

A radioactive substance is found to register 1000 counts per second on a Geiger counter. Twenty-four hours later it registers 125 counts per second. What is its half-life?
*December 5, 2012*

**Science**

If a 20 gram sample of a radioactive substance has a half-life of 6000 years, how many grams would be present after 18000 years?
*December 5, 2012*

**Physics**

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
*November 30, 2012*

**math**

if you are playing a game to toss a ball in a basket through a target what is the probability that you will win?
*October 23, 2012*

**Physics**

the input and output of hydraulic jack are respectively 1 cm and 4 cm in diameter. A lever with a mechanical advantage of 6 is used to apply force to the input piston. How much mass can the jack lift if a force of 180 N is applied to the lever and efficiency is 80%
*October 22, 2012*

**computer literacy**

what is an application program included with Windows that allows the contents of the computer, the hierarchy of folders on the computer, and the files and folders in each folder to be viewed?
*May 25, 2012*

**physics**

two uniform cylinders have different masses and different rotational inertias.they simultaneously start from rest at top of an inclined plane and rool without sliding down the plane.the cylinder that gets to the bottom first is?
*May 25, 2012*

**physics**

for a body to be in equillibrium under the combined action of several forces
*May 25, 2012*

**physics**

for an object in equillibrium the net torque acting on it vanishes only if each torque is calculated about?
*May 25, 2012*

**physics**

the conditions that the net force and the net torque both vanish?
*May 25, 2012*

**Spanish1 help**

Trabajas
*November 14, 2011*

**geometry**

each leg of an octagon is 48" what is the diameter?
*February 25, 2011*

**Social Studies**

What group of people did the black plague benefit in england and the surrounding aread?
*January 13, 2011*

**math**

What is $1500 with 7% of tax?
*October 14, 2010*

**math **

yep got it now--6395
*September 14, 2010*

**math **

4 digit number. numeral in tens place 3 times the numeral in hundreds place. numeral in my ones place is 2 more than numeral in hundreds place. numeral in thousands place is 3 less than number in tens place. number in hundreds place is 3. what is number?
*September 14, 2010*

**math **

other clues are tens digit is 1 less than thousands and tens digit is 2 more than ones
*September 14, 2010*

**US hISTORY**

What did Washington do with his slaves at the end of his presidency?
*January 8, 2010*

**SCIENCE**

The membrane around the vacuole biological term
*May 25, 2009*

**Science**

Wow, That Lawrence guy needs to keep his day job! Haha. Thanks for your help.
*December 12, 2008*

**Science**

Sweet, I hope I get an A+!!
*December 12, 2008*

**Science**

Why is it that milk sours so fast. I had googled it and false imformation has came up. I have to write a 3 page essay about how certain things sour too quickly.
*December 12, 2008*

**Social Studies**

I've seen the the nationalgeographic one. Yes, I know that no one knows. It's just that i came to this site to find out that he didn't kill himself. My teacher got into an argument with my S.S. teacher. They were practically yelling. Thank you for your help.
*December 12, 2008*

**Prayer Request**

please pray for owen and daralyn to get back together as a family and have a,good life together. and to be in love always,
*July 14, 2008*

**Prayer Request**

That dee and owen can be together again as a famliy and live a good life.
*July 14, 2008*

**math riddle ALGEBRA WITH PIZZAZZ**

what is green and makes holes a drill pickle
*April 6, 2008*

**Human Biology**

How can you identify a desert animal from an aquatic one by looking at the kidneys. I meant to put a question at the end. Morphological study of the desert heteromyid kidney with emphasis on the genus Perognathus. * Altschuler EM, * Nagle RB, * Braun EJ, * Lindstedt SL, * ...
*December 12, 2006*

**the big idea of energy**

what is it? I'm baffled. I am doing it have to include in my essay on the digestive system!!
*December 5, 2006*

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