Popular questions and responses by lisa
  1. Physics -- check answers

    1. In moving an object of mass 10 kg through a distance of 8.0 m, 40 J of work is done. The average force exerted is? my answer: 320N 2. What is the kinetic energy of a 20 kg object moving at a speed of 10 m/s? my answer: 1000J 3. the gravitational

    asked on February 23, 2014
  2. Physics-check answer please (multiple choice)

    1. A 2.5 kg mass at rest on a horizontal surface is acted upon by an applied horizontal force of 150 N. A frictional force of 100 N acts on the mass. How much work is done on the mass? my answer: would the work be 0? 2. When a rock is thrown straight up in

    asked on February 24, 2014
  3. chemistry

    VSEPR theory predicts that the geometry of AsH3 molecule is which of the following. linear trigonal planar trigonal pyramidal tetrahedral please explain the correct answer

    asked on February 23, 2014
  4. Math Algebra

    TechWiz Electronics makes a profit of $35 for each MP3 player sold and $18 for each DVD player sold. Last week, TechWiz sold a combined total of 130 MP3 and DVD players. Let x be the number of MP3 players TechWiz sold last week. Write an expression for the

    asked on November 2, 2015
  5. chemistry

    Electronegativity is a concept that is useful along with other concepts in predicting the polarity of a bond deciding how many electrons are involved in a bond formulating a statement of the octet rule determining the charge on a polyatomic ion

    asked on February 23, 2014
  6. Science

    Two birds collide in midair. Before the collision, their combined momentum was 88 kg•m/s to the west. What is their combined momentum after the collision? A. 88 kg•m/s east B. 88 g•m/s north C. 88 kg•m/s down D. 88 kg•m/s west

    asked on December 6, 2016
  7. science

    A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light? Electron emission would get stopped. Electrons are emitted with more velocity. Electrons are emitted with

    asked on April 18, 2019
  8. Physics--Pressure

    a house at the bottom of a hill is fed by a full tank of water 5m deep and connected to the house by a pipe that is 110m long at an angle of 58 from the horizontal. a) determine the water gauge pressure at the house b) how high could the water shoot if it

    asked on March 22, 2009
  9. AP Physics

    mgh=1/2mv^2, solve for the variable v

    asked on August 1, 2010
  10. chemistry HELP!

    Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution: a solution that is 0.170 M in HC2H3O2 and 0.105 M in KC2H3O2

    asked on December 15, 2010
  11. Physics -- check answers please

    1. In moving an object of mass 10 kg through a distance of 8.0 m, 40 J of work is done. The average force exerted is? my answer: 320N 2. What is the kinetic energy of a 20 kg object moving at a speed of 10 m/s? my answer: 1000J 3. the gravitational

    asked on February 23, 2014
  12. math

    One pump can empty a pool in 5 days, whereas a second pump can empty the pool in 7 days. How long will it take the two pumps, working together, to empty the pool?

    asked on August 2, 2011
  13. Statistics

    A contractor is interested in the total cost of a project for which he intends to bid. He estimates that materials will cost P25000 and that his labour will cost P900 per day. The contractor then formulates the probability distribution for completion time

    asked on July 15, 2020
  14. Math

    Betsy, a recent retiree, requires $6,000 per year in extra income. She has $60,000 to invest and can invest in B-rated bonds paying 13% per year or in a certificate of deposit (CD) paying 3% per year. How much money should be invested in each to realize

    asked on October 6, 2010
  15. math

    in the middle of a page draw a small oval oriented vertically connected to the bottom of the oval draw a small rectangle oriented vertically what does this resemble

    asked on June 28, 2016
  16. advanced functions

    =the height in metres of a weather ballon above the ground after t seconds can be modelled by the function h(t)=-2t^3+3t^2+149, for 0

    asked on February 20, 2014
  17. Chemistry

    Write balanced complete ionic equation for HC2H3O2(aq) + K2CO3(aq)-----> H2O(l)+CO2(g)+KC2H3O2(aq) I put 2H+(aq)+2C2H3O2-2(aq)2K+(ag)+CO3-2(aq)------>H2O(l)+CO2(g)+2K+(aq)+C2H3O2-2(aq) and said it was wrong, but I got this part right. 2H+(aq)+CO3

    asked on October 29, 2010
  18. chemistry

    What is the freezing point of a solution that contains 10.0 g of glucose (C6H12O6)in 100.g of H20? Kf for water is 1.86C/m.

    asked on February 15, 2010
  19. Physics

    In proton-beam therapy, a high-energy beam of protons is fired at a tumor. The protons come to rest in the tumor, depositing their kinetic energy and breaking apart the tumor’s DNA, thus killing its cells. For one patient, it is desired that 0.10 J of

    asked on October 6, 2013
  20. Life Span Development

    As Selena and her friends are walking home after school they approach a corner store and see bags of candy and snacks on open shelves outside the front door. A young clerk is also outside waiting for customers. As they get closer, they see the clerk go

    asked on January 4, 2016
  21. calculus

    A particle is moving with the given data. Find the position of the particle. a(t) = t2 − 5t + 3, s(0) = 0, s(1) = 20 s(t) =

    asked on January 10, 2017
  22. Trig

    A railroad tunnel is shaped like a semiellipse as shown below. A semiellipse is shown on the coordinate plane with vertices on the x axis and one point of intersection with the positive y axis. The height of the tunnel at the center is 27 ft and the

    asked on September 27, 2014
  23. Chemistry

    2. Which bond is polar covalent? a) H2 b) Cl2 c) HCl d) O2

    asked on December 2, 2010
  24. Chem H.W. Help!

    If You transfer a sample of a gas at 17 °C from a volume of 5.67 L and 1.10 atm to a container at 37 °C that has a pressure of 1.10 atm. What is the new volume of the gas?

    asked on May 5, 2008
  25. Intermediate reading

    Can you help me with the sentence check 2 Chapter 17 and 18 in the improving vocabulary skill workbook?

    asked on January 27, 2013
  26. Math

    Recall that the equation for the horizontal distance h in feet of a projectile with initial velocity v0 and initial angle theta is given by h=v0^2/16 sin theta cos theta . a. Assume the initial velocity is 60 ft/second. What initial angle will you need to

    asked on December 6, 2013
  27. Chemistry

    A 5 gram sample of a hydrate of BaCL2 was heated, and only 4.3g of the anhydrous salt remained. What percentage of water was in the hydrate?

    asked on February 1, 2012
  28. Statistics

    Suppose that a new drug is being investigated to combat some form of cancer. In phase II trials, researchers look for evidence that the drug will improve survival by first seeing if it can reduce the size of a patient’s tumours by at least 50%. If a

    asked on July 15, 2020
  29. Stats

    Running times for 400 meters are Normally distributed for young men between 18 and 30 years of age with a mean of 93 seconds and a standard deviation of 16 seconds. Thus, 99.7% of running times are approximately between Need help

    asked on February 12, 2017
  30. Physics

    A cubical block of wood 0.100 m on a side and with a density 550 kg/m^3 of floats in a jar of water. Oil with a density of 750 kg/m^3 is poured on the water until the top of the oil layer is 0.035 m below the top of the block. 1. How deep is the oil layer?

    asked on January 17, 2014
  31. Chemistry

    If 4.0 L of a 4.8 M SrCl2 solution is diluted to 50 L , what is the molarity of the diluted solution?

    asked on November 1, 2010
  32. English

    The following thesis statement indicates that the body of the speech will contain ____ numerals. "Abraham Lincoln's speeches appealed to the emotion of listeners, conveyed a strong sense of leadership, and were sutied to the complicated political setting

    asked on February 1, 2007
  33. Math

    What is 48,567kilo in metric tons? Im in 4th grade no judge

    asked on April 24, 2018
  34. Spanish

    Write four different questions for the following sentences 1. Mariana canta en el coro (choir) de la universidad 2. Carlos busca el libro de arte 3. La profesora Gutierrez ensena contabilidad 4.Ustedes necesitan hablar con el profesor de economia

    asked on October 4, 2014
  35. College Chemistry

    Consider the reaction. 4Fe(s) + 3O2(g) ¨ 2Fe2O3(s) If 0.500 mol of Fe reacts with 0.400 mol of O2, what are the limiting reactant and the theoretical yield in moles of Fe2O3 for the reaction, respectively?

    asked on March 26, 2012
  36. physics

    What will be the equilibrium temperature when a 245-g block of copper at 285„aC is placed in a 145-g aluminum calorimeter cup containing 825g of water at 12.0„aC?

    asked on March 18, 2012
  37. MATH

    the square of a number is equal to the sum of 21 and 4 times the number. find the number X=-3 X=7 RIGHT?

    asked on January 4, 2012
  38. chemistry

    what is the geometry of the molecular compound formed by the reaction of sulfur with hydrogen? linear angular trigonal planar tetrahedral please explain the correct answer

    asked on February 23, 2014
  39. chemistry

    Write a balanced equation for the neutralization of each of the following. Express your answer as a chemical equation. Identify all of the phases in your answer. Part A: H3PO4(aq) and NaOH(aq) Part B: Hl(aq) and LiOH(aq) Part C: HNO3(aq) and Ca(OH)2(aq

    asked on April 1, 2012
  40. assigment

    is it difficult to accurately measure prejudice?

    asked on August 24, 2007
  41. Chemistry

    Consider the following equilibrium: NH4Cl(s)--->NH3(g) + HCl(g) Suppose a vessel containing NH4Cl(s), NH3(g) and HCl(g) is at equilibrium. If the volume of vessel is instantaneously doubled while keeping the temp constant when a new equilibrium is reacted,

    asked on February 10, 2013
  42. Chemistry

    Write the acid-dissociation reaction of nitrous acid (HNO2) and its acidity constant expression.

    asked on March 25, 2012
  43. math

    Workers who manufacture shirts are sometimes paid based on the number of shirts they produce. Compute Lyle's gross pay if she made 380 shirts. The rate per shirt is given by the differential piecework schedule below: Pay Level Pay Level Items Produced Rate

    asked on September 17, 2013
  44. Organic Chemistry

    How many stereoisomers are possible for each of the following structures? Draw them, and name each by the R-S and E-Z conventions a) 4-methyl-2,5-heptadiene b) 1,2,5-trichloro-3-hexene

    asked on September 5, 2013
  45. AP Chemistry

    Which is a stronger base in aqueous solution, IO- or IO3-? Explain.

    asked on April 26, 2010
  46. Chemistry

    Consider the combustion of liquid methanol, CH3OH (l) CH3OH (l) +3/2O2 (g) = CO2 (g) + 2H2O(l) H = -726.5 kJ What is for the reaction represented by this equation? Express your answer using four significant figures

    asked on June 28, 2011
  47. writing

    papers that are inadequately developed often contain repetition and wordy generalities

    asked on March 16, 2011
  48. chemistry

    A chemist wants to make 5.5 L of a 0.250 M CaCl2 solution, what mass of CaCl2 (in g) should the chemist use?

    asked on November 20, 2010
  49. College Physics

    A tiny 0.60g ball carries a charge of magnitude f 8.0uC. It is suspended by a thread in a downward 300 N/C electric field. What is the tension in the thread if the charge on the ball is negative? - Positive?

    asked on January 26, 2010
  50. character traits

    What are inner and outer character traits?

    asked on September 16, 2008
  51. finance

    it cost a contactor $13750 to manufacture their first unit. The company expects to experience a 93% unit learning curve. Estimate the cost of the 14th unit. (Round intermediate calculation to 4 decimal places)?

    asked on November 30, 2018
  52. ashford university

    1. Which water cycle processes are represented in this model and by what components? Answer = 2. Which water cycle processes are not represented? How could the model be altered to include each of these processes? Answer = 3. How would the “weather” be

    asked on July 4, 2015
  53. Chemistry

    At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3. H2(g)+I2(g) 2HI(g) Kc= 53.3 At this temperature, 0.300 mol of H2 and 0.300 mol of I2 were placed in a 1.00-L container to react. What concentration of HI is present at

    asked on March 8, 2013
  54. Chemistry

    Which is a polar covalent bond? PbCl2 or CS2?

    asked on December 2, 2011
  55. Chemistry

    How much heat, in kilojoules, is associated with the production of 273kg of slaked lime, Ca(OH)2? CaO(s)+H2O(l)-->Ca(OH)2(s) delta H=-65.2kJ

    asked on November 4, 2010
  56. Chem

    If a class of 30 chemistry students have 17 of the students who are female. What percentage of students is female?

    asked on February 5, 2008
  57. Algebra

    The force needed to keep a car from skidding on a curve varies inversely as the radius of the curve and jointly as the weight of the car and the square of the car's speed.Suppose that 400 pounds of force keeps a 1600-pound car from skidding on a curve of

    asked on March 11, 2016
  58. walden university

    Which of the following is a temperamental characteristic that is associated with prosocial behavior? A. Low social anxiety B. Popularity among peers C. Coherent self-concept D. Intelligence

    asked on January 9, 2016
  59. Statistics

    The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?

    asked on August 22, 2014


    asked on June 20, 2014
  61. Medical Billing and Coding

    This 65-year-old chronic cigarette smoker for the past 40 years was admitted to the hospital with acute exacerbation of her chronic obstructive pulmonary disease. She has a hsitory of anxiety syndrome due to hypothyroidism, and is maintained on medications

    asked on November 1, 2013
  62. Reading

    Is this the correct word for each sentence 1-2. Lynn begged the bank to __ the overdraft charge of thirty dollars, telling them that it would entirely __ her savings. 3-4. In high school, Julio was voted "Most Likely to Become a Psychologist." It was the

    asked on February 13, 2013
  63. statistics

    A person who has served three consecutive terms of four yrs shall be eligible for appointment, nomination for or election to the office of council-member no sooner than for a term beginning eight years after completion of that council member's third

    asked on June 4, 2012
  64. Math for business

    I am trying to figure this out. I know I am not right. I was looking for some help on how to get the proper answer. Morgan Company received from Lee Company an invoice dated September 27. Terms were 2/10 EOM. List price on the invoice was $5,000 (freight

    asked on August 31, 2011
  65. Chemistry

    A chemist wants to make 4.5 L of a 0.310 M CaCl2 solution what mass of CaCl2 (in g) should the chemist use

    asked on November 1, 2010
  66. Maths

    Joong Ki, Minho and Ali have some green and some red buttons. Joong Ki has 9 more buttons than Minho. Minho has 5 more green buttons than Joong Ki. The ratio of the number of red buttons that Joong Ki has to the number of red buttons that Minho has is 5:3.

    asked on January 10, 2020
  67. 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 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? (in m) could someone help me please!!!

    asked on February 7, 2016
  68. chemistry

    Diborane (B2H6) is a highly reactive boron hydride, which was once considered as a possible rocket fuel for the U.S. space program. Calculate ∆H for the synthesis of diborane from its elements, according to the equation 2 B (s) + 3 H2 (g) → B2H6 (g)

    asked on January 25, 2015
  69. Physics -- check answers please

    1. what is 67 K equivalent to in Celsius? answer: -206.15 C 2. what is 458.9 Celsius in K? answer: 732.05 3. heat is closely related to: a)temperature b)thermal energy c)force d)convection currents answer: b 4. What does a low efficiency score reveal about

    asked on March 3, 2014
  70. chemistry

    In which of the following pairs of compounds are both members of the pair ionic compounds? Explain a. Pl3 and HBr b. H2S and NCl3 c. LiF and H20 d. LiI and NiO DrBob222 you said you would choose the answer d and I should know how to figure this out. I

    asked on February 9, 2014
  71. Medical Billing and Coding

    This is a 71-year-old female admitted with a complaint of right-sided weakness. She denies any fever, shortness of breath, cough, headaches, or chest pain. Patient has NIDDM, controlled by diet. Patient currently smokes. Mild right-sided paralysis was

    asked on November 1, 2013
  72. Pre Cal

    Sec^2 2u-1/Sec^2 2u = Sin^2 2u

    asked on February 19, 2013
  73. chemistry

    Stearic acid, nature's most common fatty acid, dimerizes when dissolved in hexane: 2C17H35COOH Picture (C17H35COOH)2; ΔH°rxn = -172 kJ The equilibrium constant for this reaction at 28°C is 2900. Estimate the equilibrium constant at 38°C.

    asked on March 8, 2012
  74. chemistry

    A piper delivers 10.04, 10.02, 10.08, and 10.06 mL in consecutive trails. Find the mean volume and the average deviation from the mean...please help some responded but didn't answer the question.

    asked on January 31, 2012
  75. Organic Chemistry

    What are the advantages of using a solvent pair for recrystallization? Select all that apply. A) You can control the solubility of the substance in the mixed solvent. B) You don't have to know the exact amounts of the solvents needed. C) You can quickly

    asked on September 29, 2011
  76. Math

    An initial investment of $1000 is appreciated for 8 years in an account that earns 9% interest, compounded annually. Find the amount of money in the account at the end of the period

    asked on June 8, 2011
  77. Algebra 1 honors

    A pineapple drink contains 15% pineapple juice. How much pure pineapple juice should be added to 8 quarts of the drink to obtain a mixture containing 50% pineapple juice.

    asked on September 23, 2008
  78. languge arts

    the giver which words can be used to describe jonas father very caring and sensitive**** highly intelligent and driven usually loyal and obedient

    asked on May 5, 2016
  79. Gen edu 499 quiz critical thinki

    The very large increase in allergies over the last thirty years is due to the great success of immunizations administered over this time period. Since immunizations have nearly eliminated life-threatening diseases such as polio, the human immune system

    asked on September 6, 2015
  80. Chemistry

    which of the following sets of elements is arranged in order of decresing electronegativity? O,S,As Cl, B, CL Br, Cl, P Be, C, O please explain correct answer

    asked on February 23, 2014
  81. math

    Perform the given set operation. Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. (Enter your answers as a comma-separated list. Enter EMPTY for the empty set.) {x | x is a multiple of 2} ∪ {x is a multiple of 7}

    asked on October 10, 2013
  82. Organic Chemistry

    Which of the following substances can exist in an optically active form a) 1,3 dibromopropane b) ethyl cyclohexane c) 3 ethylpentane

    asked on September 5, 2013
  83. AP Chem

    For the following equilibrium system, which of the following changes will form more CaCO3? CO2(g) + Ca(OH)2(s) CaCO3(s) + H2O(l) deltaH(rxn) = -113 kJ My choices are: a) Decrease temperature at a constant pressure (no phase change) B) Increase volume at a

    asked on February 26, 2013
  84. Physics

    In a baseball a pitcher can accelerate a .15kg ball from rest to 98 mi/h in a distance of 1.7m a) what is the average force exerted on a ball during a pitch? b)If the mass of the ball is increased, is the force required of the pitcher increased, decreased

    asked on February 7, 2013

    A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the mixture is 334 mmHg and the partial pressure of the oxygen is 1.02 atm, what is the total pressure of the mixture in torr?

    asked on December 19, 2012


    asked on July 15, 2012
  87. Chemistry

    At equilibrium, it was found that [CH3COOH] = 0.8537 M, [CH3COO-] = 0.0040 M, and [H3O+] = 0.0040 M. Calculate the acidity constant of CH3COOH and the pH value of the solution. - Please show how you solve the problem.

    asked on March 25, 2012
  88. algebra

    Translate to an inequality. Use the variable x. My salary next year will be at least $26000

    asked on May 24, 2011
  89. Chemistry

    the type of reaction in a voltaic cell is best described as 1.spontaneous oxidation reaction only 2.nonspontaneous oxidation reaction only 3.spontaneous oxidation-reduction reaction 4.nonspontaneous oxidation-reduction reaction i know its spontaneous, but

    asked on March 27, 2011
  90. Geometry

    15.) Find the volume of a barber's pole having the shape of a right circular cylinder of radius 5 in. and height 29 in. topped by a sphere of the same radius. Round to the nearest tenth, if necessary. A) 2276.5 in.3 B) 2799.8 in.3 C) 1046.7 in.3 D) 4553.0

    asked on August 20, 2009
  91. Algebra

    ABC phone company charges $18 per month plus 7 cents per minute of phone calls. XYZ phone company charges $9 per month and 10 cents per minute of phone calls. How many minutes of phone calls should be made each month to make the costs for the two companies

    asked on July 15, 2008
  92. English

    (Who, To Whom) is she talking?

    asked on January 20, 2020
  93. Chemistry

    A portable electric water heater transfers 255 watts (W of power to 5.5 L of water, where 1 W=1J/s.How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 27∘C to 49∘C? (Assume that the water has a density of 1.0

    asked on September 12, 2014
  94. Statistics

    Many dairy cows now receive injections of BST, a hormone intended to spur greater milk production. A group of 53 Jersey cows increased average milk production from 43 to 52 pounds per day, with a standard deviation of 4.8 lbs. Is this evidence that the

    asked on November 21, 2013
  95. Math

    Express x=e^(-2t), y=4e^(3t) in the form y = f(x) by eliminating the parameter.

    asked on August 4, 2013
  96. davenport

    Chapter 6 Problem 14 -- Avon Products Using the financial statements provided below and any other information you find relevant, answer the following questions: a. What was the book value of Avon’s shareholders’ equity from 2001 to 2003? What were

    asked on April 7, 2012
  97. english

    38. Which of the following sentences contains a helping verb? (1 point) Eduardo looked in the basement, but the puppy wasn’t there. Sakkom hung wind chimes because she loves the sound. Roger has never performed a solo in his life. The leader of the troop

    asked on January 11, 2012
  98. Living environment

    1.All of Earth's water, land, and atmosphere within which life exists is known as a population b. an ecosystem c.the biosphere d. a biotic community IS THE ANSWER C

    asked on January 3, 2012
  99. Chemistry

    3.57×10−2 mol Ba Express your answer using three significant figures

    asked on October 14, 2010
  100. AP Physics

    qV=1/2mv^2, solve for the variable v

    asked on August 1, 2010


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