Popular questions and responses by Casey
  1. Chemistry

    An unknown compound contains only C, H, and O. Combustion of 4.50 g of this compound produced 10.2 g of CO2 and 4.19 g of H2O. What is this empirical formula of the unknown compound?

    asked on September 21, 2013
  2. Physics

    1.A block accelerates at 3.1 m/s2 down a plane inclined at an angle 24.0◦. Find μk between the block and the in- clined plane. The acceleration of gravity is 9.81 m/s2 . 2.A 1200 kg car moves along a horizontal road at speed v0 = 20.1 m/s. The road is

    asked on November 2, 2016
  3. Calculus

    A sporting goods store sells 100 pool tables per year. It costs $20 to store one pool table for a year, based on the average inventory on hand. It costs $40 for each delivery of pool tables. How many times per year and in what lot size should the store

    asked on March 3, 2012
  4. chemistry

    write and equation for the reaction of triethylamine and water. does the eqilibrium go to the right or left. so far what I have is C6H15N + H2O but I'm not sure of the products

    asked on April 12, 2012
  5. Chemistry

    Which pair of molecules has the strongest dipole-dipole interactions? a- CO2 and CO2 b- CO2 and CH4 c- NH3 and NH3 d- NH3 and CH4 e- CH4 and CH4 Would it be C?

    asked on November 8, 2009
  6. Algebra

    A ball is thrown into the air. The height h, in feet, of the ball can be modeled by the equation h= -16t^2+20t+6, where t is the time, in seconds, the ball is in the air. When will the ball hit the ground? first should I use x= -b/2a?

    asked on June 6, 2013
  7. english

    All of the following items are expressed in the subjunctive except _____. a wish a condition contrary to fact a that clause expressing necessity a statement of fact

    asked on November 20, 2014
  8. Chemistry

    What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 140.0 mL of 0.400 M Pb(NO3)2? I desperately need help with this, I cannot figure it out, my mind is bleeding.

    asked on June 17, 2010
  9. chemistry

    An aqueous solution is 22.0% by mass silver nitrate, AgNO3, and has a density of 1.22 g/mL. what is the molality of silver nitrate in the solution?

    asked on June 12, 2011
  10. Physics Block and ramp

    A crate of mass 0.812 kg is placed on a rough incline of an angle 35.3 degrees. Near the base of the incline is a spring of spring constant 1140 N/m. The mass is pressed against the spring a distance x and released. It moves up the slope 0.169 meters from

    asked on June 6, 2011
  11. English/concrete nouns

    Select all of the concrete nouns. iron anger faith toolbox perseverance lamb grace tooth I think it's B,C,E, and G

    asked on November 21, 2014
  12. Calculus Max/Min Prob

    At 7:00 am, one ship was 60 miles due east from a second ship.If the first ship sailed west at 20 mph, and the second ship sailed southeast at 30 mph, at what time are they closest together?

    asked on May 10, 2012
  13. Physics

    A binary star system consists of two equal mass stars that revolve in circular orbits about their center of mass. The period of the motion, T=29.6 days, and the orbital speed v= 220 km/s of the stars can be measured from telescopic observations. What is

    asked on July 12, 2011
  14. gtg in 8 min.

    How much heat is contained in 100 kg of water at 60.0 °C? Be mindful of significant figure rules for both multiplication and addition. 30 kcal 2.10 x 104 kcal 2.40 x 104 kcal 2.77 x 104 kcal

    asked on November 20, 2014
  15. Int.Science/laws of thermodynamics

    Watch the heat engine animation in the lesson text above. Does this animation illustrate a "new and improved" heat engine? yes no

    asked on November 24, 2014
  16. Alg 1

    The popultion of Medford High is 800 students & the population of WEstville High is 1240 students. Medfords pop. has been increasing by 30 students per year, while westville has been decreasing by 25 students per year. In how many yearas will the

    asked on March 9, 2011
  17. chem-carbs

    D-ribose is treated with a mild oxidizing agent. What is the product of this reaction?

    asked on March 12, 2012
  18. algebra

    Suppose the speedometer in your car reads 55.0 mph also written as mile/hour. What is your speed in m/sec? (1 km = 0.621 mi.) unit factor methond soooo lost on this one please help!!!

    asked on April 3, 2011
  19. chemistry

    What volume of 4.50M HCl can be made by mixing 5.65M HCl with 250 mL of 3.55M HCl?

    asked on July 24, 2010

    Identify the word in italics. This is the dog I was telling you about. demonstrative pronoun indefinite pronoun interrogative pronoun relative pronoun not a pronoun

    asked on September 26, 2014
  21. Calculus

    Suppose the revenue from producing and selling x units of a given product is given by R(x)=10x-0.02x^2 a) Find the number of units produced if the revenue is $800. I really need help with this, I don't know what to do?

    asked on February 3, 2012
  22. Trig problem

    What is a coterminal angle with 170 degrees?

    asked on August 14, 2009
  23. Int.Science

    How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C? Be mindful of significant figure rules for both multiplication and addition. 450 kcal 430 kcal 280 kcal 130 kcal

    asked on November 20, 2014
  24. Physics

    A parachutist with mass 79.7 kg jumps from an airplane traveling at a speed vi= 112 km/hr at a height H = 2570 m. He lands with a speed of vf = 5.21 m/s. What is the change in mechanical energy (J) of the earth- parachutist system from just after the jump

    asked on June 18, 2011
  25. Chemistry

    An automobile gasoline tank holds 20.0 gal when full. How many pounds of gasoline will it hold if the gasoline has a density of 0.560 g/mL?

    asked on September 10, 2012
  26. Algebra 2

    The excursion boat on the river takes 2½ hours to make the trip to a point 12 miles upstream and to return. If the rate at which the boat travels in still water is 5 times the rate of the river current, what is the rate of the current? Which of the

    asked on October 13, 2012
  27. Math

    A population of 75 foxes in a wildlife preserve quadruples in size every 15 yr. The function y= 75 * 4^x , where x is the number of 15 yr periods, models the population growth. How many foxes will there be after 45 years?

    asked on March 7, 2013
  28. English

    In American English, a collective noun used as a unit takes _____ verbs and pronouns. singular plural

    asked on November 24, 2014
  29. Government

    Why didn't Georgia send delegates to the First Continental Congress? They were the only state that didn't and i have a theory but i'm not quite sure. Just wanted to get others thoughts. Thank ya!

    asked on September 30, 2007
  30. Physics - Spring gun

    A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.87-g pellet is placed against the compressed and latched spring. The spring latches at a compression of 4.87 cm, and it takes a force of

    asked on May 29, 2011
  31. Science

    If a mineral sample has a mass of 10 g, how many grams of oxygen does it contain? You need more information than that to determine the amount of oxygen or any other element in the mineral. Your question is the same kind as, "My car was in the rain today.

    asked on December 9, 2006
  32. US Government

    In the beginning of our nation seats were reapportioned after the first three years, but today we reapportion seats in the House every 10 years. A) True B) False

    asked on July 12, 2014
  33. Chemistry

    For which of the following reactions is the value of Delta H rxn equal to Delta H of formation? I. 2Ca(s) + O2(g) --> 2CaO(s) II. C2H2(g) + H2(g) --> C2H4(g) III. S(s) + O3(g) --> SO3(g) IV. 3Mg(s) + N2(g) --> Mg3N2(s). According to my answer key, the only

    asked on July 11, 2010
  34. Earth Science

    How many hours of daylight occur at the following locations on the specified dates? March 22 ---------------- 40 degrees north 0 degrees 90 degrees south December 22 ---------------- 40 degrees north 0 degrees 90 degrees south

    asked on October 29, 2010

    A farmer has 165 feet of fencing material in which to enclose a rectangle area. He wants the length x to be greater than 50 feet and width y to be no more than 20 feet. write a system to represent this situation.

    asked on March 13, 2011
  36. Chemistry

    It says to write the balanced equation for the complete combustion of cyclobutanol in Oxygen. I'm not even sure what the product is supposed to look like so how can I balance the equation? Please help. C4H8O + O2 ---> C4H8O

    asked on July 11, 2010
  37. US Government

    Public opinion is crucial in a democracy, for if we are truly a government "for the people, by the people," it is then essential that we know what the people think and want. True or false?

    asked on July 8, 2014
  38. of Thermodynamics

    The efficiency of the engines in the two previous problems are the same, comparing the input and output temperatures. True False

    asked on November 21, 2014
  39. english

    Select all that apply. Which of the following can function as adjectives? infinitive phrase gerund phrase participial phrase

    asked on November 20, 2014
  40. history

    What caused the fiords in Scandinavia? earthquakes erosion glaciers floods

    asked on September 26, 2014
  41. chemistry

    Nitrogen gas can be prepared by passing gaseous ammonia over solid copper (II) oxide at high temperature. The other products of the reaction are solid copper and water vapor. If a sample containing 20.3 g of NH3 is reacted with 95.8 g of copper oxide 1.

    asked on November 8, 2016
  42. Statistics

    A lottery ticket has a grand prize of $28 million. The probability of winning the grand prize is .000000023. Based on the expected value of the lottery ticket, would you pay $1 for a ticket? Show your calculations and reasoning clearly.

    asked on August 29, 2010
  43. science

    1. If you turn on the burner on a gas stove under a pan of cold water, energy moves from the burner to the pan of water. What is this type of energy transfer called? 2. If you burn wood in a fireplace, which type of energy resource are you using? 3. Which

    asked on December 12, 2018
  44. Organic Chemistry

    Explain why methanol and acetone are not suitable solvents for extracting organic compounds from aqueous solutions.

    asked on January 21, 2010
  45. trigonometry

    simplify sin7x-sin3x as a product of trig functions.

    asked on April 19, 2011
  46. Algebra 1

    Given: 5x - 6y = 0. What is the x-intercept? (0, 0) (-1/5, 0) (0, 1/6) no intercept

    asked on October 24, 2014
  47. Physical Science

    A force of 400.0 N is exerted on a 1,250 N car while moving it a distance of 3.0m. How much work was done on the car?

    asked on September 30, 2010
  48. English

    If a letter is brief, be sure to explain why. True False

    asked on September 30, 2014
  49. Physics

    At what speed would a 1140-kg car have the same momentum as a 12,600-kg truck traveling at 25 km/hr? The hint given to this problem is that I need to find the velocity of the car and truck. Converting 25 km/hr to m/s I get 6.944 m/s as the initial

    asked on June 26, 2011

    An inverse relationship can be represented by: a straight line a bar chart

    asked on October 23, 2014
  51. Physics

    A force of 310 N is applied horizontally to a crate in order to displace the crate 45.0 m across a level floor at a constant velocity. As a result of this work, the crate's internal energy is increased by an amount equal to 12 percent of the crate's

    asked on December 4, 2012

    How many grams of CH4 are required to produce 43 g of Cu according to the following equation: 4CuO + CH4 --> CO2 + 2H20 + 4Cu? I already tried to work the problem myself, and I may have gotten this right, but I do not have an answer key to compare to.

    asked on July 10, 2010
  53. Statistics

    The heights of American women ages 18 to 29 are normally distributed with a mean of 64.3 inches and a standard deviation of 3.8 inches. An American woman in this age bracket is chosen at random. What is the probability that she is less than 70 inches tall?

    asked on July 7, 2017
  54. math 6th grade

    a tiger can eat 15% of his body weight he eats 75lbs how much does he weigh

    asked on December 11, 2013
  55. Chemistry

    If 10.0g of CaCl2 and 10.0g of NaCl are dissolved in 100.0mL of solution, what is the concentration of chloride ions? I found the molar mass of CaCl2 is 111.0g/mol; the molar mass of NaCl is 58.44g/mol. I divided 10g CaCl2/111.0g CaCl2 I divided 10g

    asked on July 12, 2010
  56. Chemistry!

    Use the equation below and determine what volume of O2 at STP is needed to react with 1.5 moles of C2H4? Balanced equation: C2H4 + 3O2 --> 2CO2 + 2H20 So 1 mole of C2H4/3 mol O2 --> 1.5 mols/ 4.5 mols O2. So if its 1 mol equals 1 liter, than it should be

    asked on July 10, 2010
  57. Business math

    Compute the difference between the ordinary interest and the exact interest for a loan with a principle amount of $1100 at 12 percent for 120 days. I'm getting $0.60 Can you check my work?

    asked on February 21, 2015
  58. trig

    convert the point with polar coordinates (2,7pi/6) into rectangular coordinates.

    asked on April 19, 2011
  59. algebra

    Write an inequality that describes the region of the coordinate plane not included in the graph of y

    asked on February 7, 2013
  60. History

    Why was it difficult for Congress to fulfill its duties under the Articles of Confederation? Congress lacked the power to regulate foreign trade Any congressional action required the executive approval*** Most congressional decisions required the approval

    asked on November 20, 2019
  61. Earth Science

    Please determine the noon sun angle at the given latitudes on April 11: 40 degrees north 0 degrees

    asked on October 29, 2010
  62. Chemistry

    1. Suppose o2, n2 and Ar were placed at 1.00 atm and 273 K in closed containers. A tiny hole is opened in each container, allowing each gas to diffuse into another container filled with neon gas. What is the ratio of the rate of diffusion of nitrogen to

    asked on May 22, 2015
  63. Chemistry

    Suppose the atmospheric pressure during the experiment was 751 mmHg. The temperature of the water was found to be 23.0 degrees celsius. What is the pressure of the oxygen gas, Po2 that is produced?

    asked on September 27, 2012
  64. English/ms.sue

    Select the complete subordinate clause (including all modifiers). I aced my test because I remembered to study. I aced my test my test because my test because I remembered to study because I remembered because I remembered to study This sentence does not

    asked on September 26, 2014
  65. physics

    a proton (mass 1.67 x 10^-27 kg) with a velocity of 1.10 x 10 7 m/s collides with a motionless helium nucleus, and the proton bounces back with a speed of 6.00 x 10 6 m/s. The helium nucleus moves forward with a velocity of 4.00 x 10 6 m/s after the

    asked on March 24, 2013
  66. US Government

    True or False. Public opinion polls are consistent & reliable, and allow one to measure the intensity, stability, and/or relevance of all opinions studied.

    asked on July 9, 2014
  67. Chemistry

    Assuming that the smallest measurable wavelength in an experiment is 0.410 fm (femtometers), what is the maximum mass of an object traveling at 815 m*s^-1 for which the de Broglie wavelength is observable?

    asked on November 2, 2011
  68. Calculus

    A swimming pool is 40 feet long, 20 feet wide, 8 feet deep at the deep end, and 3 feet deep at the shallow end; the bottom is rectangular. If the pool is filled by pumping water into it at the rate of 40 cubic feet per minute, how fast is the water level

    asked on March 2, 2012
  69. Math

    A rectangle is 6 cm long and 5 cm wide. When each dimension is increased by x cm, the area is tripled. Find the value of x.

    asked on December 6, 2012
  70. Math

    Determine if it is always sometimes never or always true - ray LJ and ray TJ are opposite rays -the intersection of two planes is a point

    asked on September 12, 2011
  71. Science

    Draw the Lewis structure for N2H2, a neutral molecule.

    asked on September 7, 2009

    Which of the following statements is true? A hypothesis is created at the end of an experiment. The dependent variable is changed by the experimenter. The best hypotheses are written as answers to a question. Observations are often used to form questions

    asked on October 2, 2014
  73. science

    h t t p: / / tinypic . co m/r/f2vw1w/3 In the link above (take out the spaces) there is supposed to be a picture representing a foodweb. 1. Which letter is the producer? Is it A? 2. I'm not sure what B and C would represent? A. producer B. primary consumer

    asked on August 30, 2009
  74. Statistics

    Salaries of 50 college graduates who took a statistics course in college have a​ mean, x of $68,200. Assuming a standard​ deviation, σ​, of $12,279​, construct a 95% confidence interval for estimating the population mean μ.

    asked on November 28, 2016
  75. Physics - pulley

    A construction crew pulls up an 87.5-kg load using a rope thrown over a pulley and pulled by an electric motor. They lift the load 15.5 m and it arrives with a speed of 15.6 m/s having started from rest. Assume that acceleration was not constant. I have

    asked on June 3, 2011
  76. English

    A business letter does not serve as a record of a transaction. True False

    asked on September 30, 2014
  77. US Government

    _________ allows States to split their electoral votes to mirror the popular vote within the particular State. A) Direct Popular Election B) The Proportional Plan C) The District Plan D) The National Bonus Plan

    asked on July 15, 2014
  78. physics

    The fastest recoded pitch in Major league baseball was thrown by nolan ryan in 1974. If this pitch were thrown horizontally, the ball would fall 0.809m(2.65 ft)by the time it reached home plate, 18.3m (60ft) away. how fast was ryans pitch?

    asked on November 6, 2010
  79. history

    Which mountains lie between Spain and France? Rocky Pyrenees Alps Andes

    asked on September 26, 2014
  80. US Government

    The major television networks' share of viewers was greatly reduced by the growth of A) newspapers B) PBS C) cable television D) political parties

    asked on July 9, 2014
  81. Accounting

    In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at $8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the

    asked on February 27, 2012
  82. Physics

    In an intense battle, gunfire is so intense that bullets from opposite sides collide in midair. Suppose that one (with mass M= 5.12 g moving to the right at a speed V= 214 m/s directed 21.3 degrees above the horizontal) collides and fuses with another with

    asked on June 28, 2011
  83. Chemistry

    Which pair of molecules has the strongest dipole-dipole interactions? a- CO2 and CO2 b- CO2 and CH4 c- NH3 and NH3 d- NH3 and CH4 e- CH4 and CH4 how do you figure out the answer to this question?

    asked on November 8, 2009
  84. Chemistry

    How to calculate the energy required for the gas phase process represented by Na(g) + Br(g) -> Na+(g) + Br- (g)

    asked on March 22, 2020
  85. Accounting

    Identify each statement as true or false. If false, indicate how to correct the statement. 1. Depreciation is a process of asset valuation, not cost allocation. 2. Depreciation provides for the proper matching of expenses with revenues. 3. The book value

    asked on April 2, 2012
  86. Calculus- please help

    A sporting goods store sells 100 pool tables per year. It costs $20 to store one pool table for a year, based on the average inventory on hand. It costs $40 for each delivery of pool tables. How many times per year and in what lot size should the store

    asked on March 4, 2012
  87. biology

    most of the total mass of a plant comesfrom which source? Nitrogen Oxygen Carbon Dioxide Water Hydrogen Is is carbon dioxide?

    asked on August 30, 2009
  88. of Thermodynamics

    The outward evidence for this transformation can be seen only in the mechanical motion of the motor. True False

    asked on November 21, 2014
  89. Physics

    A cart loaded with bricks has a total mass of 25.4 kg and is pulled at constant speed by a rope. The rope is inclined at 30.6 ◦ above the horizontal and the cart moves 18.4 m on a horizontal floor. The coefficient of kinetic friction between ground and

    asked on October 13, 2013
  90. Physics Please help!

    the coefficient of static friction between the coffee cup and the roof of a car is 0.28, If the maximum acceleration the car can have without causing a cup of coffee (on the top of the car) to slide is 2.7 m/s^. What is the smallest amount of time in which

    asked on January 5, 2012
  91. Physcis

    An object slides without friction in a bowl shaped like a hemisphere. It is released from rest at one edge of the bowl, slides up the other side before stopping right on the edge of the bowl. During which part of this process is the power being delivered

    asked on June 22, 2011
  92. History

    Why was it difficult for Congress to fulfill its duties under the Articles of Confederation? Congress lacked the power to regulate foreign trade Any congressional action required the executive approval*** Most congressional decisions required the approval

    asked on November 20, 2019

    The earth can be considered a heat engine because it receives heat from the sun and converts it into mechanical energy to produce winds and evaporate water. True False

    asked on November 24, 2014
  94. Statistics

    Please Help! If someone could just show me how to do a problem like this! The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, where d is the amount

    asked on October 29, 2013
  95. Precalculus

    Write an equation for rational function with given properties. a) a hole at x = 1 b) a vertical asymptote anywhere and a horizontal asymptote along the x-axis c) a hole at x = -2 and a vertical asymptote at x = 1 d) a vertical asymptote at x = -1 and a

    asked on January 10, 2012
  96. Algebra

    How are the processes of adding monomials and adding polynomials alike? How are the processes different?

    asked on April 22, 2013
  97. english

    Identify the italicized phrase in the following sentence. Jolene went to the city to find a new job. adverb adjective noun

    asked on September 26, 2014
  98. Calculus

    A sporting goods store sells 100 pool tables per year. It costs $20 to store one pool table for a year, based on the average inventory on hand. It costs $40 for each delivery of pool tables. How many times per year and in what lot size should the store

    asked on March 3, 2012
  99. Chemistry

    What is the % by mass of chlorine in CH2Cl2? I calculated the molar mass of CH2Cl2 which is 84.93. I than calculated the molar mass of Cl2 which was 70.9. Than I divided 70.9 by 84.03 and my percent by mass of chlorine is 83.5 percent. Is this correct?

    asked on July 10, 2010
  100. physics

    Monochromatic light with a wavelength of 5.0 E -7 meter passes through two narrow slits, producing an interference pattern on a screen 3.0 meters away. The first order bright band lines 2.0 E -2 meters away from the central bright maxima. What is the

    asked on June 10, 2010


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