Thursday
October 2, 2014

Posts by kate


Total # Posts: 1,689

Chemistry
Please help me! I do not know what to do. 500.0 g ethyl alcohol at 25°C (C = 2.46 J/g x °C) absorbs 74.0 J of heat energy. What is the final temperature? What is the specific heat constant if 621 g of Metal A raises the temperature of 500.0 g of water by 3.20°C and...
September 25, 2014

physics
A football is thrown with an initial upward velocity component of 15.0m/s and a horizontal velocity component of 17.0m/s . a:How much time is required for the football to reach the highest point in its trajectory? b:How high does it get above the ground? c:How much time after ...
September 22, 2014

Science/physics
I done the problem and was wondering if my answer is right I got 1.87 and then 12.4 degrees above x axis please help At time t = 0 s, a puck is sliding on a horizontal table with a velocity 4.60 m/s, 32.0° above the +x axis. As the puck slides, a constant acceleration acts...
September 14, 2014

English
thank you
September 11, 2014

English
I need help with diagramming sentences. How do you diagram "Bruno and Shmuel talk and share food"? Is it a compound sentence, or does it have two verbs in a single clause?
September 11, 2014

Algebra
A 2 mile cab cost $5. A 6 mile cab costs $9. Write an equation to model the cost: c of a cab ride miles: m.
September 7, 2014

math
thank you
August 29, 2014

math
11. The midpoint of is E(–1, 0). One endpoint is C(5, 2). What are the coordinates of the other endpoint? can someone please explain how to do this problem
August 29, 2014

physics
thanks. :) how can i illustrate the problem?
August 27, 2014

physics
An airplane travels 200 km/h through the air. If it heads directly against a 40- km/h wind, what is its speed relative to the ground?
August 27, 2014

english
ok thank you
August 15, 2014

english
1. Which of the following sources is least likely to have been edited for accuracy? (1 point) a city newspaper a personal Web site an encyclopedia article a published book 2. Which of the following is NOT true about bias? (1 point) Using both biased and non-biased resources in...
August 15, 2014

english
1. All of the following define the theme of a story EXCEPT (1 point) the central idea of a work the underlying message in literature the methods of characterization employed by the writer the lesson, or moral, of the story which can be inferred by readers 2. Which of the ...
August 15, 2014

english
thank you
August 15, 2014

english
can you check please
August 15, 2014

english
3.A 2.C
August 15, 2014

english
so on number 2 is C or D
August 15, 2014

english
so is 3.c 4.b
August 15, 2014

english
1. In “At the Tourist Centre in Boston,” the speaker's tone can best be identified as (1 point) disapproving. downcast. enraged. sarcastic. 2. Which line from the poem best supports the tone identified above? (1 point) "the green of the trees dulled;" &...
August 15, 2014

english
1. "Similarly", "on the other hand", and "however" are signals that the author of a source is using which of the following text structures? (1 point) sequencing comparison and contrast cause and effect problem and solution check my work my answer ...
August 14, 2014

Trigonometry
Thank you, Steve!!
August 13, 2014

Trigonometry
Find the perimeter of a pentagon circumscribed about the circle that has a radius of 1.5 units.
August 13, 2014

english
is it a
August 13, 2014

english
4. In both the Gettysburg Address and “Letter from Birmingham Jail,” the writers (1 point) comment on the tribulations faced by a nation at war. honor those who have fought for freedom. demand the revision of the nation’s unjust laws. expound on the notion of ...
August 13, 2014

chem
What is the maximum mass of S8 in grams that can be produced by combining 87.1 g of each reagent? Do not include units in your answer. Answer to three significant figures. 8SO2 + 16H2S → 3S8 + 16H2O
August 1, 2014

Science
While picking up passengers in a big city, a taxi driver drives 20.0 blocks south, then 15.0 blocks east, and then 6.0 more blocks south. What is the magnitude of the taxi’s resultant displacement? Iv'e been using the equation sqrt(x^2+y^2+z^2) THe answer I get is 25....
July 28, 2014

math
a drug is supplied as a 20 mg/ml solution in a 50 ml vial. you need to make 15 ml of a 10 mg/ml solution. how much concentrate and how much diluent are needed to obtain the desired final volume?
July 9, 2014

math
what is procentage strength of a mixture made from 250 ml of witch hazel containing 16% alcohol, 150 ml of 90% alcohol and 450 ml of distilled water?
July 9, 2014

math
you have mixed equal parts of a 10 % and a 2,5 % benzocaine ointment what is the resulting concentration?
July 7, 2014

math
you have mixed 25g of 2%crem into 35g of 6% cream. What is the resulting concentration?
July 7, 2014

math
A patient needs 45% dextrose 100ml The pharmacy has only 70% dextrose 500ml. a) how much concentrate will you need b) how much diluent
July 7, 2014

finance
A year ago, the Alpine Growth Fund was being quoted at an NAV of $21.50 and an offer price of $23.35; today, it’s being quoted at $23.04 (NAV) and $25.04 (offer). Use the approximate yield formula or a handheld financial calculator to find the rate of return on this load ...
June 23, 2014

Finance
An investor in the 28% tax bracket is trying to decide which of two bonds to select: one is a 5.5% U.S. Treasury bond selling at par; the other is a municipal bond with a 4.25% coupon, which is also selling at par. Which of these two bonds should the investor select? Why?
June 22, 2014

world history
What parallels, or differences, can you identify between Athenian expansionism in the age of the Peloponnesian War and the contemporary career of the American republic
June 21, 2014

calc 1
find the derivative f(x)= (x^4+x^2+1)/(x^2+1)
June 11, 2014

Calc
find the derivative f(x)= e^-3x x sin(4x)
June 11, 2014

history
10 examples of racism/white supremacy.
May 31, 2014

math
what is the even numbers here 13, 12, 10, 19, 16? what is the odd numbers here 17 18 15 16 11?
May 13, 2014

Physics
In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x ...
May 11, 2014

Phys
Centripetal force: a race car driver wants to stay as straight as possible around the curves in the race. What should happen to his radius, force and velocity?
May 7, 2014

spanish
I haven't had a chance to meet with my Spanish professor about my composition and I need to turn it in soon. It's basically just a short past narration (15 sentences) using only the preterite and imperfect. If someone could read through it and let me know what things I...
May 3, 2014

chemistry
CH(CH3)2-NH-CH2-CH2-CH2-CH3
April 9, 2014

chemistry
I can't seem to figure out the name of this organic molecule. I know it's an amine, but that's it. There are two methyls (CH3) attached to a CH, followed by (in order) NH, CH2, CH2, CH2, and CH3. (ignore the ^^^, I had to use them so the atoms would line up...
April 9, 2014

chemistry
Nevermind! I finally solved it! It was 3,3-diethyl-1-pentyne (I forgot I had to write 3 twice).
April 9, 2014

chemistry
My "picture" of the molecule didn't work. Hopefully, this will work better (~ represents a triple bond and ignore the ```) ````````CH3 ````````CH2 HC ~ C - C - CH2 - CH3 ````````CH2 ````````CH3
April 9, 2014

chemistry
I'm having trouble naming this organic chemistry compound. (I'm not sure how to include a picture in this, so I'll try my best to explain it in words and attempt to type it out) The full formula is C9H16. It's an alkyne and the longest carbon chain is 5 carbons...
April 9, 2014

physics
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called...
April 7, 2014

chemistry
"Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous solution: CuBr2(aq)" Possible oxidation reactions: 1. 2Br- -> Br2 + 2e- = -1.09 2. 2H2O -> O2 + 4H+ + 4e- = -1.23 Possible reduction ...
April 2, 2014

math
Mr.Ricci spent 1/3 of his salary on food and 2/5 of the remainder on transport. What fraction of his salary did he have left? If he had $600 left, find his salary.
March 19, 2014

Math
XY= -25 what is the constant of variation for this relationship? a. 1/4 b. -25 c. -2.5 d. -0.4
March 11, 2014

physics
Find the mass of 0°C ice that 10g of 100 °C steam will completely melt
February 26, 2014

Business
#1 Is C. Industry. #3 It's not D. In the study guide it says to prepare the introduction and overview last. It's not B. I used that in my test and it was wrong. I'm stuck between C and A. I don't know 2 or 4.
February 11, 2014

math
guess my rule with two rules. Having such as hard time understanding this and would like to be able to explain to my 2nd grader! home wor sheet has 2 circles joined togeather, rule A has 2 girls in it with glasses, in the middle there is another girl with glasses, in rule B ...
February 4, 2014

Writing
Hey Sam was the answer right?
February 4, 2014

physics
A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 2.0 m/s. Determine the amplitude A of the motion.
January 25, 2014

Chemistry Check Please! ?Fixed
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.548 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
January 17, 2014

Chemistry Check Please!
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
January 16, 2014

Chemisty Check Please!
B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0.10049 mol 6.5556 mol/(6.5556 mol + 0.10049 mol= 0.984902 mol A) M= (0.10049)/(0.00344 kg + 0.118 kg)= 0.82749 m c12h22O11
January 14, 2014

Chemisty
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution?
January 14, 2014

Math
Select the x-coordinate of the vertex of the parabola defined by the function f(x) =-5x^2+7x+8
January 11, 2014

Math - Check my answer?
Thank you!
January 8, 2014

Math - Check my answer?
Write the decimal 0.063 as a percent. Answer choices: 0.63% 6.3% 63% 630% MY ANSWER: 6.3%
January 8, 2014

Check my answer?
Thank you so much!
January 8, 2014

Check my answer?
Write the fraction 8/9 as a percent. Round to the nearest hundredth of a percent where necessary. My answer: 88.9%
January 8, 2014

MATH
It would take you a long time to measure the length across town with feet. C. length of your room, would be a more logical answer.
January 7, 2014

math
There were 10 more boys than girls at an outing. Each boy was given 3 sweets and each girl was given 4 sweets. A total of 156 sweets were given to the children. How many girls were there at the outing?
January 1, 2014

ELA
Oh okay thanks I'll just ask my teacher for help. Thanks anyways
December 17, 2013

ELA
Give an example of an simile using only the words butterfly and meadows.
December 17, 2013

math
If you were moving at a speed of 0.00025 kilometers per hour, what is your speed in meters per minute?
December 4, 2013

pre-calc help
Thank you so much!!!
November 27, 2013

pre-calc help
Convert the rectangular coordinates to polar coordinates with r > 0 and 0 ≤ θ < 2π. (9, −9) (r, θ) = ?
November 27, 2013

pre-calc help
Thank you so much!
November 27, 2013

pre-calc help
Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 5 sin^2(x)- 21 sin(x)+ 4 =0
November 27, 2013

South America
What is the longitude and latitude of every piece of south America?
November 20, 2013

Pre-Calc (Prove the identity)
Prove the identity. (show your work please) tan(x − π/4)= (tan x − 1)/(tan x + 1) Thank you!
November 19, 2013

algebra
4(5n-7)=10n+2
November 6, 2013

math
What's the opposite reciprocal of 1?
November 6, 2013

Calculus
Nevermind, got it.
October 30, 2013

Calculus
A spotlight on the ground is shining on a wall 12m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 2m from the building?
October 30, 2013

Physics
If the mass of a planet is 0.571 times that of the Earth and its radius is 0.787 times that of the Earth, estimate the gravitational field g at the surface of the planet. The gravitational acceleration on Earth is 9.8 m/s2. Answer in units of m/s2
October 29, 2013

Physics
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.1 × 106 m/s. Find the central force acting on the electron as it revolves in a circular orbit of radius 4.51 × 10−11 m. Answer in units of N
October 29, 2013

STAT
a. 2.28
October 29, 2013

Science
b
October 20, 2013

Math
Make up a data set of at least 12 numbers that have the following landmarks Maximum 18 Mode 7 Range 13 Median 12 Make a bar graph of the data
October 10, 2013

Chemistry
The bottle was previously opeedn, thus altering the water content. This is because hydrates do not keep their stoichiometric ratio of cations and anions to water molecules. Hope this helps.
October 8, 2013

Math
Combine like terms and solve 6a + 5a = -11 6a+5a = 11a 1) 11a = -11 /11 /11 2) a = -1
September 25, 2013

math
Just break it down 4 (10's)= 10+10+10+10 = 4*10 = 40 5 (10's)= 10+10+10+10+10 = 5*10 = 50 9 (1's)= 1+1+1+1+1+1+1+1+1= 9*1 = 9 You can also rewrite the problem this way 40 < x < 50 This means the number has to be between 40 and 50, but it must also have 9 ones...
September 25, 2013

algebra
A statue is 8 feet tall. The display case for a model of the statue is 18 inches tall. Which scale allows the tallest model of the statue that will fit in the display case. A 1 inch : 2 inches B 1 inch : 7 inches C 1 inch : 5 inches D 1 inch : 10 inches
September 16, 2013

English
What is the tone of at the lunch counter?
September 16, 2013

Algebra, HELP! PLEASE!
In triangle ABC, angle B is four times as large as angle A. The measure of angle C is 12∘ more than that of angle A. Find the measures of the angles.
September 7, 2013

Physics
two objects move toward each other collide and separate. there was no net external force acting on the objects but some kinetic energy was lost. is momentum conserved ? what is the explanation ?
August 16, 2013

math
= 27600 X 100/115 = 24000
August 16, 2013

Physics
An object with mass 20 kg is moving horizontally. if the velocity of the object is doubled, does the momentum increased or decreased ? what is the explanation ?
August 16, 2013

math
4/57(x+8)=1/3
August 16, 2013

Chemistry
3.00 g of Zn is allow to react with 1.75 g CuSO4 . calculate how many grams of Zn will remain after the reaction is complete ?
August 11, 2013

Chemistry
suppose 8.00 g of CH is allowed to burn in the presence of 9.00 g of oxygen. how much (in gram) CH4 , O2 and H2O remain after the reaction is complete ?
August 11, 2013

Chemistry
0.300 moles of bromine gas (Br2) and 0.500 moles of chlorine gas (Cl2) react to for tribromochlorine (Br3Cl). how many moles of this product will form ?
August 11, 2013

biology
Why all enzyme work well in their own optimum temperature and optimum pH ? i need more explanation about why different enzyme have different optimum temperature and different optimum pH to react. i hope to get a long explanation for my essay that contain 5 marks.
July 31, 2013

Harvard Justice
According to the Professor Sandel, if judgments about the good are unavoidable in debates about justice and rights, is it possible to reason about the good (these judgments about the good)? a) If reasoning about the good means that you must have a single principle or rule or ...
July 31, 2013

biology
Do all enzymes function within the different temperature range, like they do with pH?
July 29, 2013

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