Most popular questions and responses by Court
  1. chemistry

    Rank the following species according to the increasing energy needed to raise the temperature of 10.0 g of the substance by 25.0 ∘C. Aluminum-.897J/g water- 4.184J/g Stainless steel - .500J/g cast iron- .460J/g copper-.385J/g Can someone please show me

    asked on January 29, 2015
  2. Calc and Vectors

    A professional basketball team plays in a stadium that holds 23,000 spectators. With ticket prices at $60, the average attendance had been 18,000. When ticket prices were lowered to $55, the average attendance rose to 20,000. Based on this pattern, how

    asked on January 10, 2014
  3. calculus and vectors

    A traffic sign is hanging from two wires. If the weight of the sign is 35 N, what are the tensions in the two wires as shown below? (# in degrees) --------------------- \ 56 45/ \ / \ / \ /

    asked on September 26, 2013
  4. chemistry

    At 25 C the following heats of reaction are known: 2CIf (g)+ O2(g) -> CL2O (g) + f2O Delta H rxn= 167.4 kj/mol 2CIf3(g) + 2O2 (g)-> Cl2O(g) + 3F2O(g) Delta H rxn= 341.4 2F2(g) + O2(g) -> 2F2O(g) Delta H rxn= -43.4kj/mol at the temperature, use Hess's Law

    asked on March 4, 2012
  5. Physics

    A 0.50-kg mass is placed on the end of a vertical spring that has a spring constant of 75 N/m and eased down into its equilibrium position. (a) Determine the change in spring (elastic) potential energy of the system. PEs=1/2kx^2=1/2(75)(0.5)^2=9.375 (b)

    asked on December 14, 2016

    Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What

    asked on April 12, 2010
  7. 8th grade math

    circle A has a raduis that is twice the length og the raduis of circle B. Which is an accurate statement about the relationship of these areas of circle A and B and y? a.the area of circle A is 4 times the area of circle B b. the area of circle A is twice

    asked on December 16, 2010
  8. Calc and Vectors

    Corey is asked to find the maximum value of a function. Not having a complete understanding of the process, Corey decides to find the derivative of the function, set it equal to zero, and solve. The resulting value, Corey reasons, will yield the maximum

    asked on January 10, 2014
  9. 2nd grade math

    My number has 1 hundred and 1 thousand. It has double the number of tens as ones. What could my number be?

    asked on October 17, 2016
  10. chem

    The ion product Of D2O is 1.35x 10^-15 at 25 degrees C. For a solution to be acidic the PDF must be what?

    asked on April 22, 2012
  11. chemistry

    Many reaction involving heterogeneous catalysts are zeroth order, that is rate=k. An example is the decomposition of phosphine (PH3) over tungsten (w): 4Ph3---> P4 + 6H2 It is found That the reaction is independent of PH3. As lon 1 g as phosphine's

    asked on March 25, 2012
  12. calc and vectors

    The following table displays the number of HIV diagnoses per year in a particular country. Year 1997 1998 1999 2000 2001 2002 2003 2004 2005 Diagnoses 2512 2343 2230 2113 2178 2495 2496 2538 2518 Using Curve Expert or another curve modelling program,

    asked on January 10, 2014
  13. Math

    If Sarah divided her friends into 4 groups and each person still got the same time to talk, how long would it take to tell the stories?

    asked on June 9, 2019
  14. math

    Troy is building a pool that is proportional to the Olympic-sized pool. The width of his pool will be 625 centimeters. find the scale factor troy will use to build his pool use the scale factor to show the length of troys pool if the length of the Olympica

    asked on December 16, 2010
  15. Physics

    A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 3.5 s, how tall is the building?

    asked on September 11, 2011
  16. chemistry

    The activation energy for the decomposition reaction, 2 HI---> H2 + Hi Is 186 kj/mol. The rate at 555 k is 3.2 x 10 -7L/mol. Sec. What is the rate at 645 k

    asked on March 25, 2012
  17. algebra

    how do i find the greatest monomial factor of 4x^2-17? p.s. the ^ means the the number following in superscript((which is a tiny number above it))) it says 4x squared minus 17

    asked on November 29, 2008
  18. Geomerty

    Find a Counterexample to show that the conjecture is false. Conjecture: Any number that is divisible by 6 is also divisible by 12. A. 36 B. 30 C. 48 D. 60 Im thinking that the answer is B. 30, but i was just making sure.

    asked on April 12, 2010
  19. chem

    Butadiene can undergo the following reaction To form a dimer(two butadiene molecules hooked together). 2c4h8---->c8h12. The half life for the reaction at a given temperature is 5.92x10-2 sec. The reaction kinetics are second order. 1. If the initial

    asked on March 25, 2012
  20. Calculus and vectors

    Velocity represents the slope of a displacement function. Suppose an object was moving to the right, then stopped, then continued moving to the right. What would the displacement function look like?

    asked on December 16, 2013
  21. Chemistry

    Why is BF3 a planar molecule, while NH3 is not?

    asked on April 14, 2009
  22. Chem

    a solution containing 100g of unknown liquid and 900g water has a freezing point pf -3.33 C. given kf=1.86 degrees c for water, the moelcular weight of the unknown liquid is what?

    asked on February 12, 2012
  23. Physics

    the puma, which can jump to a height of 12.9 ft when leaving the ground at an angle of 44°. With what speed, in SI units, must the animal leave the ground to reach that height?

    asked on September 7, 2011
  24. English

    Okay, another question on the Diary Of A Young Girl by Anne Frank. In the book, Anne says this statement: "There is nothing we can do but wait as calmly as we can till the misery comes to an end." How does this statement help to place readers in the

    asked on June 28, 2011
  25. Algebra

    The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits $750 million for this project, what percentage of the pollutants can be removed?

    asked on January 2, 2011
  26. chemistry

    the thermochemical equation for th edissocation of hydrogen gas into atoms may be written : h2-> 2H delta H 1824.2 what is the ration of the energy yield on combustion of hydrogen atoms to steam to yield ion combustion of an equal mass of hydrogen

    asked on March 4, 2012
  27. pre-calc

    Newline Recyclers processes used aluminum into food or dink containers. The recycling plant processes up to 1200 tons of aluminum per week. At least 300 tons must be produced for food containers, while at least 450 tons must be produced for drink

    asked on February 17, 2009
  28. Calculus and vectors

    it would appear that for any thrown object has a height that can be expressed using a quadratic expression. The maximum height occurred in the middle of the two zero values. Will this always be the case? What if the ball were thrown from a platform of

    asked on December 16, 2013
  29. Economics

    In the short run, if the Reserve bank decreases interest rates, then consumption and investment_____, planned aggregate expenditure _____ are short-run equilibrium output_____. A: increase, increases, increases B: increase, increases, decreases C:

    asked on August 15, 2009
  30. chem

    A distribution curve shows how fractions of non-ionized acid and its conjugate base vary as a function of Ph. The curves of the plot of [CH3COOH] vs. [CH3COO-] vs. PHwill intersect at a Ph of What?

    asked on April 22, 2012
  31. chemistry

    In the presence of a tungsten catalyst at high temperature, the decomposition of ammonia to nitrogen and hydrogen is a zero order process. If the rate constant at a particular temperature us 3.7x10^-6 mol. How long will it take for an ammonia concentration

    asked on March 26, 2012
  32. Algebra

    The function f(x)=(250x)/(100-x) models the cost, f(x), in millions of dollars, to remove x% of a river's pollutants. Use this functions to solve: If the government commits $750 million for this project, what percentage of the pollutants can be removed?

    asked on January 2, 2011
  33. languages

    What words go with each other? 1. conversation 2. narrator's perspective 3. feeling generated by a story 4. background 5. inanimate object with human will 6. overstatement 7. protagonist against someone or something else 8. high point of action 9. action

    asked on June 2, 2010
  34. chemistry

    Gasoline in Great Britain costs 1.40 euros per liter. What is the American equivalent cost in Dollars per Gallon? (A "euro" in Britain is equal to $1.59 in American)...Please help me answer this!!!!!

    asked on September 11, 2008
  35. English

    Why did the relationship between Anne and her mother become strained? In a few sentences, analyze how their relationship as a mother and daughter was changing. This is a question for "The Diary of a Young Girl" by Anne Frank, and the answer is supposedly

    asked on June 27, 2011
  36. Calculus and vectors

    A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which

    asked on September 27, 2013
  37. Geometry

    A rectangle has area and length. Find the width. Area=27t^2-18t Length= 9t How do I find the width?

    asked on September 4, 2013
  38. physics

    A stone is tied to a string (length = 0.945 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the

    asked on October 8, 2016
  39. English

    One last question for today that I need checked. What can you assume about the effective-ness of the efforts of Dutch resistance work-ers to sabotate the Nazis? I just put it was very effective, but I feel that it's asking for more in the question, and

    asked on June 28, 2011
  40. grammar

    is it a pronoun

    asked on December 18, 2012
  41. PreCalculus

    How would you find the limit of (an + bn) when an=-2 and bn=-16? Or just how to find limits in general?

    asked on March 27, 2011
  42. geomerty

    Write two conditional statements that make up each bioconditinal. 1. A whole number is multiple of 5 and only if its last digit is ethier a 0 or a 5. 2. Two lines are perpendicular if and only if they intersect to form four right angles. 3. You live in

    asked on April 12, 2010
  1. geometry

    So Steve is exactly right. Since our smaller decagon is 50 cm2, and our larger decagon's sides increase by 4 times, we multiply 50 * 4^2 or 50*16 which = 800cm2. Remember that the base equation for finding the area of any polygon is 1/2ap. So since the

    posted on April 9, 2019
  2. literature

    @yah, yeet Nerds are smart if you were smart you'd know that.

    posted on November 3, 2018
  3. science

    @Alice In Jishka Land You have issues.

    posted on October 23, 2018
  4. 7th grade math ASAP quick please

    Taking you all to Court

    posted on October 18, 2018

    change the 16log(2) to 16ln(2) and then the answer is correct.

    posted on July 14, 2018
  6. chemistry 12

    HI(aq)+Al(s)→ Express your answer as a balanced chemical equation. Identify all of the phases in your answer. and H2SO4(aq)+TiO2(s)→ Express your answer as a balanced chemical equation. Identify all of the phases in your answer. along with: Write a

    posted on March 25, 2018
  7. physical sicence

    How fast must a ball be thrown upward to reach a height of 12m?

    posted on September 12, 2016
  8. Chemistry Equilibrium

    The answer is dg=0 only. The other conditions may happen at equilibrium but are not always the case.

    posted on April 29, 2013
  9. 3rd grade math

    no there is only 14/30 of it left

    posted on December 18, 2012
  10. Statistics

    What is the standard deviation of the following data? If necessary, round your answer to two decimal places.13, 11, 4, 5, 6, 9, 10, 12, 15, 16

    posted on July 27, 2012
  11. chem

    A distribution curve shows how the fractions of non ionized acid and its conjugate base vary as a function of Ph. The curves of the plot of [CH3COOH] vs. Ph and [CH3COO-] vs. Ph will intersect at a Ph of what? I need to show work

    posted on April 22, 2012
  12. chemistry

    He says we have To explain it. But I still don't knowwhat he wants us to explain?

    posted on March 25, 2012
  13. chemistry

    excatly, im just as confused. I tried to email him, no reply. The problem says what is the ratio of energy yield on combustion of hydrogen atoms to steam to the yield on combustion of an equal mass of hydrogen molecules to steam given. what am i missing

    posted on March 4, 2012
  14. English

    She is going through a very tough time and can't get herself out of this rutt because she is Jewish?

    posted on June 28, 2011
  15. English

    Is it the war, capulation, arrival of the Germans, and Jewish suffering beginning that began to strain their relationship?

    posted on June 28, 2011
  16. English

    Well, I have searched the internet and computer and continue to do so, but I think it has something to do with them moving to the hiding place finally and then her mother starts yelling to her father about Anne and Anne starts yelling to her mother and it

    posted on June 27, 2011
  17. English

    I don't know the answer to this question either, but I desperately need help with it!!! :(

    posted on June 27, 2011
  18. World Geography

    some solutions are to continue the democracy. working hard to keep a government for the people and works to help better them is key. Colombia's past has had the rich against the poor. this does not help polotically nor economically. drug cartels are taking

    posted on March 21, 2011
  19. Geometry


    posted on October 5, 2010
  20. Physical Education

    lots of endurance work is needed for touchfooty.specific skill training such as drives,passing, switching and drills at least 2 times a week will greatly improve performance for competition and i found that running atleats 3km twice a week enhanced my

    posted on February 21, 2010
  21. english

    An ear of Corn! Take out the green stuff keep the corn eat the yellow stuff throw away the rest

    posted on August 15, 2009
  22. chemistry

    the question is about learning how to do conversion factors. Thank you for your help

    posted on September 11, 2008
  23. chemistry

    well, this is the exact question I have off of an exam and I have to show my work

    posted on September 11, 2008