Most popular questions and responses by Heather
  1. chemistry

    the reaction of 7.10g carbon with excess O2 yields 12.25g of CO2. what is the percent yield of this reaction? I have tried everything and looked through all of my notes and nothing is working for stiochiometry

    asked on October 6, 2014
  2. Physics

    In the figure, the two blocks are attached by a massless rope over a frictionless pulley, and block M1 slides on the table without friction. The masses of the blocks are: M1 = 8.10kg and M2 = 3.90kg. Calculate the tension in the rope. ( g = 9.80 m/s2)

    asked on February 14, 2016
  3. Physics

    Taking the age of Earth to be about 4 ✕ 109 years and assuming its orbital radius of 1.5 ✕ 1011 m has not changed and is circular, calculate the approximate total distance Earth has traveled since its birth (in a frame of reference stationary with

    asked on November 19, 2017
  4. Social Studies

    The free-soil party was a persecutor to which political party? A. Know Nothing Party B. Whig Party C. Republican Party •• D. Copperhead Party

    asked on January 13, 2017
  5. Chemistry

    The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.28 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 127.0 kg of water at an initial

    asked on February 11, 2012
  6. music

    What is the main difference between Baroque and Classical music? I think barouge music is based on emotion but am not sure.

    asked on February 4, 2009
  7. pre-algebra

    Justin wants to use 376 ft of fencing to fence off the greatest possible rectangular area for a garden. What dimensions should he use? What will be the area of the garden? A. 89 x 99; 8811 ft B. 92 x 96; 8832 ft C. 94 x 94; 8836 ft D. 93 x 95; 8835 ft

    asked on July 26, 2017
  8. calculus 1

    A kite 100 ft above the ground moves horizontally at a speed of 10 ft/s. At what rate is the angle (in radians) between the string and the horizontal decreasing when 200 ft of string have been let out?

    asked on February 26, 2013
  9. History

    Which most accurately describe the role colonies played within the global economy? (Select all that apply.) Many colonies were established as one-crop economies to provide cash crops to imperialist nations. Some colonies used laissez-faire economics to

    asked on August 10, 2018
  10. Quantitative Reasoning (math)

    One out of every five people who buys ice cream buy vanilla ice cream. If a store sells 125 ice cream cones in one day, about how many will be vanilla? I know how to solve the proportion once I set it up, but I cant figure out how to set it up

    asked on September 10, 2014
  11. Physics

    At takeoff a commercial jet has a 45.0 m/s speed. Its tires have a diameter of 0.850 m. (a) At how many rpm are the tires rotating? Incorrect: Your answer is incorrect. rpm (b) What is the centripetal acceleration at the edge of the tire? 4764.70 Correct:

    asked on November 19, 2017
  12. chemistry

    A student placed 19.0g of glucose (c6h12o6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100ml.- mark on the neck of the flask was reached. The flask was then shaken until

    asked on February 28, 2010
  13. History

    How did Belgium rule in Rwanda contribute to genocide? Belgium rule led to the mass killing of Rwandans through ethnic cleansing. Belgium King Nicholas I ordered his army to execute Tutsis throughout Rwanda. Belgium favoritism toward Tutsis led to

    asked on August 5, 2018
  14. History

    Which explains a consequence of the rise of global virtual markets? The growth of regional economies is limited to local resources. Virtual shopping limits the product selection from which consumers may choose. Regional economic growth often occurs as a

    asked on August 5, 2018
  15. History

    How did nations collectively intensify the conditions of the Great Depression? The breakdown in economic interdependence led to the inflation of multiple currencies worldwide and reduced international trade. The raising of tariffs in different countries

    asked on August 11, 2018
  16. English

    Can someone please confirm that my answers are correct? Choose the correct pronoun to fit the context of the sentence. 1. The dog chewed ________ leash apart. A. its B. his or her C. it’s D. their E. its’ I think it's C 2. Is technology with all

    asked on May 16, 2018
  17. History

    Which describes a cultural struggle faced in the Middle East? adopting Socialist views that emulate democratic Western policies replacing Islamic beliefs with Western cultural values lack of political support for religious beliefs at the regional level

    asked on August 5, 2018
  18. History

    What allowed for the shift of political and social ideas toward the heightening of anti-Semitism in Germany? Hermann Göering established the Gestapo to round up Jewish agitators and send them to labor camps. Josef Mengele reorganized the German film

    asked on August 11, 2018
  19. History

    If humanity has passed the point where the oil supply is declining, which suggests the most practical response? start hoarding oil in underground tanks as a hedge against a future without oil increase funding for government agencies like NASA to find other

    asked on August 5, 2018
  20. Physics

    A sprinter explodes out of the starting block with an acceleration of +2.3 m/s^2, which she sustains for 1.2 s. Then, her acceleration drops to zero for the rest of the race. What is her velocity (a) at t=1.2 s ans (b) at the end of the race?

    asked on August 29, 2010
  21. pre algebra 1

    Sasha finished mowing lawns at 4:15 PM. It took 1^3/4 h to mow the first lawn. The second and third lawns she mowed each took 1^1/5 h. She took one 45-min break. When did Sasha begin mowing the first lawn? A. 10.05 A.M. B. 11:05 A.M. C. 11:21 A.M. D. 12:21

    asked on August 7, 2017
  22. Physics

    A person pushes on a 56-kg refrigerator with a horizontal force of -251 N; the minus sign indicates that the force points in the −x direction. The coefficient of static friction is 0.7. (a) If the refrigerator does not move, what are the magnitude and

    asked on October 2, 2013
  23. History

    Which best describes the political relationship between oil-producing states and their consumers? Consumer states use their economic influence to persuade oil-producing states to set lower prices on oil. The government of an oil-producing state has a

    asked on August 5, 2018
  24. History

    How did the Chinese government react to the fall of Communist Russia? The Chinese government predicted that its own system could collapse, since it had been based on the Soviet Communist model. When Soviet states withdrew from the USSR, Chinese diplomats

    asked on August 5, 2018
  25. Chemistry Lab

    Hydrogen gas was collected over water in a eudiometer at 26 degrees celcius when the atmospheric pressure was 756 mm Hg. What was the pressure of the H2 gas?

    asked on October 15, 2012
  26. History

    Which best defines electronic espionage? developing a pet restraint system that administers shocks through a collar teaching covert agents espionage skills through computer simulations spying on a government through the use of digital technology watching

    asked on August 5, 2018
  27. Quantitative Reasoning (math)

    A round silo is 60 ft tall and has a 15 ft radius. About high would a load of 32,000 cubed feet fill the silo to? Do I start with pie*radius squared?

    asked on October 10, 2014
  28. Spanish

    Could you please help proofread my paragraph for grammar and explain any issues thanks. An elementary bilingual teacher asks you to come to her class to talk to her students about how you used to celebrate the holidays with your family. First you want your

    asked on November 7, 2016
  29. History

    Which best suggests why Russia, China, and North Korea engage in malicious cyberattacks? The populations of these nations rank high in computer literacy. Their languages feature non-English fonts which aid encryption. They are renegade states beyond the

    asked on August 5, 2018
  30. Algebra help please!

    Suppose you are researching the eating habits of people your age. What sampling method could you use to find the percent of students in your grade who eat five servings of fruit and vegetables each day? What is an example of a survey question that does not

    asked on April 14, 2014
  31. History

    Which discuss the steps in the process that led to the social and political changes in South Africa? (Select all that apply.)

    asked on August 5, 2018
  32. math

    there are 4 blue tile,s 3 yellow tiles, 5 red tiles, and 2 green tiles. he draws a tile replaces it, and draws another tile. what is the probability he will draw a blue tile on both

    asked on May 19, 2014
  33. Physics

    A soccer ball accelerates from rest and rolls 6.5 m down a hill in 3.1 s. It then bumps into a tree. What is the speed of the ball just before it hits the tree? A formula to answer this question would be fine; you don't have to solve the whole thing.

    asked on September 28, 2016
  34. History

    Which identifies the relationship that Communist governments such as North Korea and China have with the media? News outlets are strictly prohibited by the government in Communist countries. The media has near-complete freedom in Communist countries as a

    asked on August 5, 2018
  35. History

    Which identifies the Department of Homeland Security’s online operation that monitors the Internet to detect cyber threats? Comprehensive National Cybersecurity Initiative Cybersecurity Resource Center Cybersecurity National Action Plan National

    asked on August 5, 2018
  36. History

    Which factor most contributed to the economic growth of the Asian nations located on the western shores of the Pacific Ocean? Cooperative inter-Pacific trade partnerships gave smaller countries enhanced bargaining power in setting prices for goods. Reduced

    asked on August 5, 2018
  37. Chemistry

    Write the balanced chemical equation for the decomposition of sodium azide. If this is a redox reaction, show half reactions and determine if spontaneous. The chemical equation is 2NaN3(s) -> 2Na(s)+3N2(g) right? I am confused on the oxidation states for

    asked on October 8, 2012
  38. History

    Which most accurately traces the changing attitudes of the protesters during the year-long Arab Spring demonstrations? The protests began with Egyptian citizens calling for social reforms, but as protests spread, Tunisian fundamentalists urged the adoption

    asked on August 5, 2018
  39. History

    Which cyberattack carries the most serious threat? A phishing attack on a chain store compromises customer data. A malware attack shuts down the power plants in a large city. Hackers launch a malicious code that shuts down Facebook. A Trojan horse virus

    asked on August 5, 2018
  40. English

    Can someone please confirm the following? 1. The yellow house down the street from me is for sale. (Down is underlined) a. preposition b. conjunction c. adjective d. adverb I think #1 is A, or C. 2. A pregnant person knows how difficult it is to get in and

    asked on May 18, 2018
  41. math

    in the rhombus angle 1=140. what are angle 2 and angle 3? a. angle 2=140, angle 3=20 b. angle 2=40, angle 3=70 c. angle 2=40, angle 3=20 d. angle 2=140, angle 3=70

    asked on March 10, 2014
  42. math

    The test scores for a math class are shown below 83,85,82,93,83,84,95,87,86,94 what is the standard deviation of the data set?

    asked on May 19, 2014
  43. Quantitative Reasoning (math)

    Your weight on the moon is relative to your weight on Earth. Neil Armstrong weighed 360 lbs. in his moon gear while on Earth, but on the moon he only weighed 60 lbs. What is the ratio of the Earth weight to the moon weight? How much would you weigh

    asked on September 11, 2014
  44. History

    Which best describes how the Korean War shaped the attitudes of the American public? American involvement in the Korean action created organized opposition that laid the foundations of the 1960s protest movements. Public outrage over the human cost of the

    asked on August 6, 2018
  45. ap history

    please help with this DBQ to what extent it is justified to characterize the industrial leaders of the 1865-1900 era as either robber barons or industrial states-man? ive looked at the internet but not much about industrial statesman. what do you think?

    asked on October 7, 2011
  46. physics

    A satellite has a mass of 106 kg and is located at 1.96 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? J (b) What is the magnitude of the gravitational force on the satellite? N

    asked on November 14, 2012
  47. History

    How has the use of e-commerce impacted local markets? E-commerce has allowed for the rapid expansion of stock buying, which has increased the use of international manufacturing and reduced the need for local factories. Internet-based shopping has

    asked on August 11, 2018
  48. Chemistry

    A 50/50 blend of engine coolant and water (by volume) is usually used in an automobile\'s engine cooling system. If your car\'s cooling system holds 4.90 gallons, what is the boiling point of the solution? Make the following assumptions in your

    asked on February 21, 2012
  49. English

    Identify the subject and complete verb in each of the following sentences. 1. Please go to the store and buy some milk for the baby. A. you; go/store B. you; go/buy C. store; go/buy D. milk; go/buy I think that it's D (milk is the subject and go/buy is the

    asked on May 16, 2018
  50. trigonometry

    An airplane is flying at an elevation of 5150 ft, directly above a straight highway. Two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35° and to the other is 55°. How far apart are

    asked on December 2, 2012
  51. Algebra

    Which of the following statements from Euclidean geometry is also true of spherical geometry? A) A line has infinite length. B) Two intersecting lines divide the plane into four regions. C) Two perpendicular lines create four right angles. D)The

    asked on October 17, 2011
  52. physics

    A ball thrown horizontally at 13.0m/s from the roof of a building lands 21.4m from the base of the building. How tall is the building?

    asked on February 5, 2015
  53. History

    How did the collapse of the Soviet Union impact Germany? Germany experienced violent protests that led to the execution of Ceausescu. Germany removed their capitalist leaders and adopted a new constitution. A German Socialist federation emerged, leading to

    asked on August 5, 2018
  54. Business Communications

    I wanted to welcome you ASAP to our little family here in the States. It's high time we shook hands in person and not just across the sea. I'm pleased as punch about getting to know you all, and I for one will do my level best to sell you on America. are

    asked on October 7, 2006
  55. Chemistry

    5.70 g of NH4Cl is added to 13.3 g of water. Calculate the molality of the solution.

    asked on February 16, 2012
  56. geometry

    A table is set for dinner. Can the legs of the table and the top of the table lie in parallel planes? Why or why not?

    asked on October 8, 2011
  57. health

    Americans spend almost _______ percent of their food budget on foods prepared away from home. A. 20 B. 30 C. 40 D. 50 Thinking it would be B.

    asked on July 26, 2017
  58. College Business Statistic

    One operation of a mill is to cut pieces of steel into parts that will later be used as the frame for front seats in an automobile. The steel is cut with a diamond saw and requires the resulting parts to be within ±0.005 inch of the length specified by

    asked on July 7, 2012
  59. Confidentiality and Allied Health

    When should information be entered into a medical record? A at the time the event occurs b at the time set aside at the end of the shift c while the physician is making rounds d when the patient is discharged from the hospital I think its a

    asked on August 31, 2016
  60. physics

    A special electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop at an amusement park. The sensor measures the magnitude of the normal force that the seat exerts on a rider. The loop-the-loop ride is in the

    asked on February 23, 2011
  61. physics

    The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a

    asked on February 23, 2011
  62. History

    How did Japan attempt to solve its economic troubles during the Great Depression? The Japanese government began to invest in less capital-intensive industries to reduce overhead and promote international trade. The collapse of the US stock market caused

    asked on August 10, 2018
  63. ratio

    given the proportion a/b=5/19, what ratio completes the equivalent proportion a/5= / ? a. a/19 b. b/19 c. 5/19 d. 19/b

    asked on March 19, 2014
  64. Chemistry

    The question says: A sample of helium is collected by displacing 182 mL of water. The pressures of the gas and the atmosphere are equalized, using the method described in this experiment. The atmospheric pressure is 738 mmHg. The temperature of the water

    asked on October 25, 2015
  65. chemistry

    First off, how do you eve find out if it would be colored or colorless? Will aqueous solutions of the following salts be colored or colorless? Explain. a. Titanium (II) chloride b. Beryllium chloride c. Tin (II) nitrate d. Iron (III) nitrate

    asked on November 20, 2013
  66. physics

    A neutron in a reactor makes an elastic head-on collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the

    asked on October 28, 2012
  67. Quantitative Chemistry

    Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 2.92. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10. Completely lost!

    asked on July 23, 2012
  68. Geometry

    #19. Given a regular octagon, find the measures of the angles formed by (a) two consecutive radii and (b) a radius and a side of the polygon.

    asked on April 8, 2014
  69. History

    Which most accurately traces the changing attitudes of the protesters during the year-long Arab Spring demonstrations? The protests began with students calling for censorship reforms, but as protests spread, university chairmen began demanding that

    asked on August 5, 2018
  70. Language Arts

    Choose the meaning that matches the word in quotation marks. Before the debate began, the speaker's heart "fluttered" with nervous anticipation, and he breathed deeply to steady his nerves. a. flapped quickly b. beat rapidly c. waved steadily d. moved

    asked on January 6, 2016
  71. Chemistry

    For a particular redox reaction NO is oxidized to NO3^- and Cu^2+ is reduced to Cu^+ . Complete and balance the equation for this reaction in basic solution. We are given this as a guide to start NO + Cu^2+ --> NO3^- + Cu^+ I started with: Cu^2+ + 2e- -->

    asked on April 9, 2014
  72. Algebra

    There are 6 cyclists in a race. There will be a first-place and a second-place prize awarded. In how many different ways can the 2 prizes be awarded?

    asked on March 16, 2017
  73. Chemistry

    The boiling point of an aqueous solution is 102.35 °C. What is the freezing point? Constants can be found here.

    asked on February 21, 2012
  74. chemistry

    what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm3? what volume would be occupied by 7.75g of this same substance? PLEASE help need the answer tonight i have a test tomorrow i kind of not understand the second

    asked on September 22, 2010
  75. History

    Which describes the situation in Yugoslavia following the fall of the Soviet Union? Post-Communist Yugoslavia experienced an intellectual and cultural renaissance, but its stricken economy never recovered. Torn by conflicting nationalistic beliefs,

    asked on August 5, 2018
  76. pre-algebra 1

    Write 6.92 x 10 -8 in standard notation. A. 0.000000692 B. 0.0000000692 C. 0.0000000069 D. 0.00000692 Please help, i have no clue!!!

    asked on July 27, 2017
  77. statistic

    Suppose a 95% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$36,080, $43,920]. The population standard deviation used for the analysis is known to be $12,000. a. What is the point estimator of the mean

    asked on April 12, 2015
  78. chemistry

    calculate the freezing point and osmotic pressure at 25 degrees celcious of an aqueous solution containing 1.0 g/L of a protein (mm=9.0*10^4g/mol) if the density of the solution is 1.0 g/cm^3

    asked on February 8, 2010
  79. Precalculus/Trig

    I can't seem to prove these trig identities and would really appreciate help: 1. cosx + 1/sin^3x = cscx/1 - cosx I changed the 1: cosx/sin^3x + sin^3x/sin^3x = cscx/1-cosx Simplified: cosx + sin^3x/sin^3x = cscx/1-cosx I don't know where to go from there.

    asked on August 15, 2014
  80. Chemistry

    At –10.00 °C (a common temperature for household freezers), what is the maximum mass of fructose (C6H12O6) you can add to 1.00 kg of pure water and still have the solution freeze? Assume that fructose is a molecular solid and does not ionize when it

    asked on February 21, 2012
  81. English

    Identify each as fragment, run-on, comma splice, or sentence. 1. One legend has it that an old lady tried to dry off her sopping wet dog by putting it in the microwave this legend also predates the microwave oven. A. fragment B. run-on C. comma splice D.

    asked on April 18, 2018
  82. chem 130

    what mass of sodium hydroxide will be required to neutralize completely 1.60x10^23 molecules of HCl?

    asked on November 17, 2015
  83. Math Calculus

    Postal regulations specify that a package sent by certain shipping methods may have a combined length and girth of no more than 99 inches. Find the dimensions of a CYLINDRICAL package with the greatest volume that may be sent by this shipping method. HINT*

    asked on October 10, 2015
  84. Algebra

    bicyclist rides 30 miles against a wind and returns 30 miles with the wind. his average speed for the return trip is 5mph faster. how fast did the cyclist ride against the wind if the total time of the trip was 5 hours

    asked on May 13, 2015
  85. Physics: Newton's third law

    A passenger in a boat approaching a dock attempts to step onto the dock before the boat has been tied up. The passenger, whose mass is 57 kg, accelerated at a rate of 3.2 m/s^2 [forward]. If the mass of the boat is 97 kg, what is the boat's acceleration

    asked on March 22, 2019
  86. Math

    Is the line through points P(3,-5) and Q(1,4) parallel to the line through points R(-1,1) and S(3-3)? Explain please.

    asked on March 9, 2014
  87. AP Environmental Science (URGENT)

    Strontium-90 is a radioactive waste product from nuclear reactors. It has a half-life of 29 years. How many years will it take for a quantity of strontium-90 to decay to 1/16 (one-sixteenth) of its original mass?

    asked on January 11, 2012
  88. criminal justice

    In 1970, the District of Columbia passed the first __________ statute which authorized denial of bail to "dangerous" persons charged with certain offenses for up to 60 days.

    asked on April 13, 2015
  89. Chemistry

    If you have 1.80 moles of H2, how many gram of NH3 can be produced?

    asked on October 31, 2012
  90. English

    Choose the progressive or emphatic verb tense that is used in each sentence. 18.Ms. Palmer has been organizing the class schedules for us. present perfect progressive past progressive present progressive 19.We had been listening to the radio when the

    asked on April 24, 2012
  91. Chemistry

    Using calculations, determine how you would make a 525 ml pg a 0.50 M solution of Cl- ions using CaCl2. I am unsure how to do this question, I was going to use C1V1=C2V2 but with this I would be missing the first part of the equation. If that is the case,

    asked on February 2, 2016
  92. chemistry

    The letters CHEMISTRY were spray painted in blue paint on the snow. After a while the sun comes out and the snow under the blue paint melts while the snow around the letters do not. Why did the snow under (rather than around) the blue paint melt?

    asked on November 19, 2013
  93. trigonometry

    An airplane is flying at an elevation of 5150 ft, directly above a straight highway. Two motorists are driving cars on the highway, both on one side of the plane. If the angle of depression to one car is 34° and to the other is 51°, how far apart are the

    asked on December 2, 2012
  94. physics

    A potter's wheel having a radius 0.45 m and a moment of inertia of 14.9 kg · m2 is rotating freely at 49 rev/min. The potter can stop the wheel in 8.0 s by pressing a wet rag against the rim and exerting a radially inward force of 72 N. Find the effective

    asked on December 1, 2012
  95. Chemistry

    What are the products of Ba(NO3)2(aq)+K2CO3(aq)?

    asked on September 22, 2012
  96. Physics

    A 555-g squirrel with a surface area of 945 cm2 falls from a 6.0-m tree to the ground. Estimate its terminal velocity. (Use the drag coefficient for a horizontal skydiver. Assume that the cross-sectional area of the squirrel can be approximated as a

    asked on November 19, 2017
  97. 4th grade math

    Write two 5-digit addends whose sum would give an estimate of 60,000

    asked on September 11, 2016
  98. physics

    A railroad car of mass 2.7 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. (a) What is the speed of the three coupled cars after the

    asked on October 27, 2012
  99. Calculus 2

    integral of xarctanxdx using integration by parts.

    asked on September 26, 2012
  100. Criminal Justice

    As far back as __________, researchers began to explore possible racial / ethnic bias in sentencing.

    asked on April 13, 2015


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