Most popular questions and responses by ann
  1. physics

    A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 79.0 m/s at ground level. The engines then fire, and the rocket accelerates upward at 3.90 m/s2 until it reaches an altitude of 980 m. At that point its

    asked on August 25, 2013
  2. cell biology

    What is the mass of 2.00 L of an intravenous glucose solution w/ a density of 1.15 g/ml?

    asked on February 25, 2011
  3. Art

    Movie professionals such as props desginers and graphic designers work together to create a believable film. Which method of creating a believable screenplay is unique to the job of a screenwriter. A. research of time period architecture and design B.

    asked on March 9, 2015
  4. math

    The derivative of f(x) = x^4/3 - x^5/5 attains its maximum value at x =

    asked on December 27, 2011
  5. chemistry

    A solution contains 2 mEq/ml of KCL (Molecular weight 74.5). If a 20 ml ampule of this solution is diluted to 1 liter what is the percent strength of the resulting solution?

    asked on February 21, 2013
  6. English

    just can't figure these sentences out. have to rewrite these sentences, correcting the problem of incorrect omission.? 1. A liberal arts background is excellent for such professions as lawyers and doctors. 2. American colleges consistently produce more

    asked on March 19, 2011
  7. college physics

    A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.355 and he exerts a

    asked on November 21, 2011
  8. Physics test review

    A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the

    asked on November 8, 2014
  9. Dudas

    John's mass is 86 kg, and Barbara's is 55 kg. He is standing on the x axis at xj = +9.0 m, while she is standing on the x axis at xb = +2.0 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch?

    asked on October 29, 2014
  10. biostatistics

    Seventeen people has been exposed to a particular disease. Each one independently has a 40% chance of contracting the disease. A hospital has the capacity to handle 10 cases of the disease. What is the probability that the hospital's capacity will be

    asked on February 5, 2014
  11. Chemistry

    A syrup is added to an empty container with a mass of 104.70 g . When 0.140 pint of syrup is added, the total mass of the container and syrup is 150.01 g . (1 qt = 2 pt) 0.140 pint= 66.2 mL 150.01g mass container and syrup 104.70g mass empty container

    asked on August 29, 2015
  12. Math

    The equation V=1/3 Bh gives the volume V of a pyramid, where B is the area of the base and h is the height. Solve this equation for B. Please help me and show your work thanks

    asked on February 16, 2012
  13. statistics

    a study of the time spent shopping in a supermarket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be a) between 25 and 30

    asked on January 6, 2011
  14. chemistry

    At 1500 °C, Kc = 5.67 for the reaction CH4(g) + H2O(g) CO(g) + 3H2(g) Calculated value of ΔG°1773 for the reaction at this temperature.

    asked on March 5, 2016
  15. math

    19. Mr. Green teaches band, choir, and math. This year, he has 57 students that take at least one of his classes. He teaches band to 25 students. There are 48 students who take either band or choir or both. There are 9 students who take both math and choir

    asked on March 25, 2015
  16. physics

    How much force is the air exerting on the front surface of the book with dimensions 19 x 27 cm. Assume atmospheric pressure equal to 100,000 Pa.

    asked on April 12, 2011
  17. maths

    A sculpture needs to lift a piece of is a cuboid with dimensions 1m by 0.6m and 0.3m.marble has a density of 2.7. work out the mass.

    asked on January 3, 2018
  18. health!

    True or False. Washing your hands can help protect you from dangerous pathogens True True or False. People die from colds each year True True or False. Infectious diseases are caused by organisms or viruses that enter and multiply within the human body.

    asked on March 11, 2015
  19. English

    Choose the correct sentence pattern for the sentences below? 1) There is good reason to be thankful. 2) The President sent the ambassador an invitation to the meeting. 3) Snow skiing is a very exciting sport. 4) I hereby declare Tuesday Shakespeare Day.

    asked on March 31, 2011
  20. Math

    Drawing a least one king when you draw a card from a standard deck 8 times (replacing the card each time you draw, so there are always 52 cards in the deck) P(at least one king in 8 attempts)= [P(1 king + 2 kings + 3 kings + 4 kings]^8 = 1/52 + 2/52 + 3/52

    asked on November 7, 2015
  21. physics

    A dockworker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 73 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 50 N is required to keep it moving

    asked on December 7, 2011
  22. math

    stamjps are sold in bookiets of 100,50, and 10.find as many different ways to buy 200 stamps as you can. record your work in the chart. could you give me some examples...please!

    asked on September 18, 2014
  23. algebra 1 function question

    given functions f(x) = 3x-5 and g(x) = 1/3 - 4/3x correct the error g(-3) = 1/3 - 4/3(3) = 1/3-4 = - 3 2/3 error i believe is 3 should be -3 so g(-3) = 1/3 - 4/3(-3) 1/3- (4/3 times -3/1) = 1/3 -( -12/3)= 1/3 +12/3 = 13/4 = 4 1/3 other one: f(1) = 1/3 -

    asked on January 6, 2012
  24. Art last question for today.

    What does a production designer create that is similar to an architects blueprint for construction A. a map to navigate the movie sets B. cartoons that detail each individual scene C. sketches of set designers to guide construction D. architectural

    asked on March 9, 2015
  25. CHEM

    A 1.000g mixture of As4S6(s) and As4S4(s) was burned in excess O2. The products were As4O6(s) and SO2(g). The solid product had a mass of 0.905g. Find the mass % of As4S4(s) in the original mixture.

    asked on September 30, 2014
  26. math

    Each number cube has 6 faces numbered 1-6. John tossed 2 number cubes several times and added the numbers each time. Sum of the number of cubes total tally number of times 2 1 ? 7 4 ?

    asked on December 11, 2017
  27. Pre-Calculus

    Consider the chemical reaction aC2H6 + bCO2 + cH2O → dC2H5OH, where a, b, c, and d are unknown positive integers.? The reaction must be balanced; that is, the number of atoms of each element must be the same before and after the reaction. For example,

    asked on December 4, 2013
  28. math

    If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 0.05, what are the odds against an earthquake? multiple choice A) 20 : 1 B) 1 : 20 C) 18 : 1 D) 19 : 1 3

    asked on October 11, 2009
  29. algebra

    The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the distance from the light bulb is

    asked on May 15, 2015
  30. physics

    what depth of mercury creates a pressure of 1 atm?

    asked on December 11, 2012
  31. Physics

    A football player of mass 103 kg running with a velocity of 2.0 m/s [E] collides head-on with a 110 kg player on the opposing team travelling with a velocity of 3.2 m/s [W]. Immediately after the collision the two players move in the same direction.

    asked on December 13, 2017
  32. math!! HELP PLEASE

    please help!!! 19. Mr. Green teaches band, choir, and math. This year, he has 57 students that take at least one of his classes. He teaches band to 25 students. There are 48 students who take either band or choir or both. There are 9 students who take both

    asked on March 25, 2015
  33. physics

    A ventilation fan has blades 0.25 m in radius rotating at 20rpm. What is the tangential speed of each blade tip? i don't understand how to do tangential speed.

    asked on January 11, 2011
  34. statistics

    assume the mean height of soldiers to be 68.22 inches with a variance of 10.8 inches. how many soldiers in a regiment of 1000 would you expect to be over 6 feet tall

    asked on September 15, 2011
  35. Geometry

    A secant and a tangent to a circle intersect in a 42 degree angle. The two arcs of the circle intercepted by the secant and tangent have measures in a 7:3 ratio. Find the measure of the third arc. If someone could help me figure out how to do the

    asked on February 11, 2015
  36. physics

    A 4.5-kg ham is thrown into a stationary 15-kg shopping cart. At what speed will the cart travel if the ham had an initial speed of 2.2 m/s? If the ham hits the cart with 2N of force, how long did the collision between the two last?

    asked on June 29, 2011
  37. Chem

    The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, k, of a particular gaseous reaction as 5.78× 10–10 cm3·molecule^–1·s^–1 at 298 K. Convert this constant, k, to torr^-1 X S^-1.

    asked on February 27, 2013
  38. chemistry

    a 1.009g mixture of the solid salts Na2SO4 and forms an aqueous solution with the precipitation of PbSO4. The precipitate was filtered and dried and its mass was determined to be .471 g. the limiting reactant was determined to be Na2SO4. Write the

    asked on March 23, 2010
  39. Physics

    Two gliders on an air track collide in a perfectly elastic collision. Glider A has mass 1.1 kg and is initially travelling at a velocity of 2.7 m/s [E]. It collides head-on with glider B with mass 2.4 kg, travelling at a velocity of 1.9 m/s [W]. Determine

    asked on December 13, 2017
  40. Physics

    A squid can propel itself by taking water into its body and then expelling it. A 0.60 kg squid expels 0.30 kg of water with a velocity of 20 m/s [S]. What is the speed of the squid immediately after expelling the water?

    asked on December 13, 2017
  41. Art

    how could and observer distinguish the home of a rich inca from a regular citizen A. home of the wealthy were made with wood. B. homes of the wealthy had no trapezoid shapes. C. homes of the wealthy had stone roofs. D. Homes of the wealthy had no mortar i

    asked on February 22, 2015
  42. Math

    A play has two roles for men and four roles for women if five men and 12 women tryout for these parts,in how many different ways can the director choose people for the roles

    asked on March 8, 2017
  43. Math Grade 5

    Mr. Jacob is 55 years old and Tony is 7 years old. In how many years will Mr. Jacob be 4 times as old as Tony? Please help me solve this.

    asked on October 19, 2012
  44. art last question

    the onion-shaped domes on St. Basil's cathedral may remind Russians of what part of their culture heritage ? A. that their religion originated in the Middle East B. That their religion emphasized unity C. that their religion originated in Russia D. that

    asked on February 22, 2015
  45. maths help

    Please could you answer my question

    asked on January 3, 2018
  46. physics

    A girl throws a slingshot pellet directly at a target that is far enough away to take 0.9 s to reach. How far below the target does the pellet hit? m How high above the target should she aim? m

    asked on December 21, 2011
  47. Health last questions.

    Physical lines of defense include A. skin, cielia, and mucous membranes *** B. hair C. nails D. teeth When a doctor feels for lymph nodes, he is checking for A. inflammation *** B. shrinking C. pain D. sensitivity Your body can get antibodies from A.

    asked on March 11, 2015
  48. Science

    Make a solutions by dissolving 4 lbs of sulfur dioxide in 100 lbs of water then heat to 30 degress C. what is the partial pressure of the sulfur dioxide over the solution specified?

    asked on April 13, 2013
  49. Science

    Johnny left a glass of milk on his bedside table for a week, and it spoiled. At the end of the week, the glass contained a yellow liquid with lumpy white chunks, and there was a terrible odor. What can be concluded? a) The milk has undergone a physical

    asked on April 16, 2015
  50. math

    Megan and Sam together take 12 minutes to wash a car. Washing the car by herself took Megan 21 minutes. How long would it take Sam to wash the car?

    asked on July 4, 2012
  51. Geometry

    2 sides of an equilateral triangle measure (y+10) units and (y^2-2) units. If the perimeter of the triangle is 21 units, what is the value of y? I was trying (y+(y+10) + (y^2-2)=21 got to y^2+2y+-13 and wasn't sure how to proceed. Or should I take a side

    asked on October 19, 2015
  52. Calculus

    Why does 2ln6 - 2ln3 = ln4?

    asked on May 5, 2014
  53. chem

    I have no idea where to start with this one... Calculate the concentration (M) of sodium ions in a solution made by diluting 40.0ml of a 0.474m solution of sodium sulfide to a total volume of 300ml

    asked on March 8, 2015
  54. geometry

    is my answer correct, please? thanks very much M = measurement If M angle 1 = 60 degrees, then m angle 3 + m angle 5 = what is answer? i put 90 degree for angle 3 which is right angle + 60 degrees = 150 given: m angle 1 = m angle 5 in statements/reasons.

    asked on June 20, 2012
  55. phys 2

    Two capacitors are identical, except that one is filled with a dielectric ( = 4.50). The empty capacitor is connected to a 12.0 Volt battery. What must be the potential difference across the plates of the capacitor filled with a dielectric so that it

    asked on February 4, 2010
  56. Math

    Theo made the table below to show the number of middle school students who attented the last football game. if this data were displayed in a circle graph, how many degrees would be in the sector representing the 8th grade Grades 6,7,8 # of students in 6th

    asked on March 16, 2015
  57. Math

    Write the exponential function y=6(1.21)t in the form y=aekt. (a) Once you have rewritten the formula, give k accurate to at least four decimal places. k= help (numbers) If t is measured in years, indicate whether the exponential function is growing or

    asked on March 15, 2016
  58. Chemistry

    Dissolving solid CaCl2 H2O in a large volume of water is endothermic to the extent of 14.6 kj/mol. Also given: CaCl2(s)+6H2O(l)->CaCl2* 6H2O(s) delta H = -97.0 kj what is the heat of solution of anhydrous CaCl2 in a large volume of water?

    asked on March 17, 2014
  59. statistics

    The Academy of Orthopedic Surgeons states that 80% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this portion is within 3% of the true proportion. How large a sample is necessary?

    asked on April 2, 2008
  60. College Chem

    A 2.446-g sample thought to contain only one volatile substance, MgCO3, was heated in a nitrogen atmosphere for 30 min. After cooling, the residue weighed 2.216 g. Calculate the percentage of magnesium carbonate in the sample.

    asked on January 16, 2012
  61. Forensic science

    The_____________spectrum is so complex it is considered to be unique: Visible Ultraviolet Infrared Microwave Fluorescence

    asked on June 13, 2017
  62. introduction of computer

    Your mom is trying to save room on her hard drive and wants to uninstall some of her applications. She asks you how to do this. What do you tell her? Question 2 options: a) Find the application folder in Windows Explore and select Uninstall from the

    asked on September 2, 2019
  63. Micro-Economics

    Suppose that the government imposes a tax on heating oil. 1. Would the deadweight loss from this tax likely be greater in the first year after it is imposed or in the fifth year? 2. Would the revenue collected from this tax likely be greater in the first

    asked on October 5, 2014
  64. Physics

    A 15 kg block is on a ramp which is inclined at 20 degrees above the horizontal. It's connected by a string to a 19kg mass which hangs over the top edge of the ramp. With no frictional forces taken into account, what is the magnitude of the acceleration of

    asked on November 9, 2017
  65. algebra

    please help me here with a and b and do i have c and d correct?, i do not know how to start. john put his spare change in jar every night. If he has $11.09, at end of Jan. . 22.27 at the end of feb, 44.35 in April, 75.82 in july, 89.00 in aug. and 114.76.

    asked on January 16, 2012
  66. chemistry

    What is a Reaction that you would expect when acetylsalicylic acid (aspirin) is heated in the presence of a CONCENTRATED acid? Thanks in advance!

    asked on August 4, 2014
  67. Physics

    What is the peak wavelength and observed color of a 50,000 K star?

    asked on February 12, 2014
  68. MATH


    asked on October 28, 2017
  69. algebra

    What is a simpler form of the radical expression? ^4sqrt 81x^20 y^8 A, 3|x^5|y^2 B. 9|x^25|y^4 C. 9x^25|y^4| D. 3x^5|y^2|

    asked on September 29, 2012
  70. chem

    what is the difference between a bunsen burner and a lab burner?

    asked on September 18, 2012
  71. algebra Please help

    .A toy rocket is shot vertically into the air from a launching pad 5 feel above the ground with an initial velocity of 72 feet per second. The height h, in feet, of the rocket above the ground as t seconds after launch is given by the function

    asked on June 2, 2015
  72. Chemistry

    Enough of a monoprotic acid is dissolved in water to produce a 0.0190 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.

    asked on March 26, 2013
  73. Chemistry

    For the following chemical reaction HCN(aq)+KOH(aq)--->H2O(l)+KCN(aq) Write the net ionic equation, including the phases.

    asked on April 3, 2016
  74. algebra

    what is x short leg for right triangle when given long leg b is 1/2x +11 when given hypotenuse c is 2x + 1 i put (-1/2x + 11) +(2x + 1) = x and came out with 20 but that did not work out when squared A + b = C. I estimated x/a = 8, then b = 15 and c = 17

    asked on April 4, 2012
  75. algebra

    please is this correct? write a direct variation equation that relates atoms of O oxygen to atoms of hydogen H Mary combined 8 atoms of hydrogen and 4 atoms of oxygen to get 4 molecules of water is this equation correct? O + 2H = WM

    asked on December 16, 2011
  76. Chemistry

    E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12? ( I do have an answer for this but I'm not so sure about it.) 2.What is the energy of light with a wavelength of 2.18 x

    asked on December 3, 2014
  77. Math

    What is the net price factor for trade discounts of 25/15/10? Answer: .57375 Just checking my homework answers

    asked on May 20, 2013
  78. Algebra

    A tennis player's swing moves along the path of an arc. If the radius of the arc's circle is 4 feet and the power and the angle of rotation is 100 degrees, what is the length of the arc?

    asked on April 11, 2015
  79. physics

    A child and sled with a combined mass of 59.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 3.40 m/s at the bottom, what is the height of the hill?

    asked on January 9, 2012
  80. forensic

    __________________ appear to match in one set of lighting conditions, but not in another. Dyes Pigments Metameric colors Simultaneous contrast colors Fluorescent fibers

    asked on July 21, 2017
  81. algerbra

    sasha researched the size of zoos in her state. she found that the zoo in the north part of the state is almost twice as large as the zoo in the south. she also found that the zoo in the south part of the state has 200 fewer than twice the number of

    asked on January 9, 2014
  82. statistics

    the scheduled commuting time on Long Island Rail Road from Glen Cove to New York is 65 minutes. Suppose that the actual commuting time is uniformly distributed between 64 and 74 minutes. What is the probability that the commuting time will be a) less than

    asked on January 11, 2011
  83. Math

    If you flip three fair coins, what is the probability that you'll get a head on the first flip, a tail on the second flip, and another head on the third flip?

    asked on April 15, 2017
  84. Health

    after neglecting to look before diving into the pool, your friend hits his head on a rock and disrupts his __________ causing him to be paralyzed from his waist down A. cardiovascular system*** B. circulatory system C. nervous system D. endocrine system

    asked on February 19, 2015
  85. Physics

    You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill. You find that the slope of the hill is theta= 12.0°, that the cars were

    asked on February 15, 2013
  86. Math

    A rectangular prism has a width of 92 ft and a volume of 240 ft3. Find the volume of a similar prism with a width of 46 ft. Round to the nearest tenth, if necessary. 30 ft3 40 ft3 60 ft3 120 ft3 can someone please help me. I'm having trouble working this

    asked on February 23, 2015
  87. math

    Find last years salary if after a 3% pay raise this years salary is $35,020

    asked on October 23, 2013
  88. physics

    PLEASE HELP ME SOLVE !!!! InMay 1998, forest fires in southernMexico and Guatemala spread smoke all the way to Austin. Those fires consumed forest land at a rate of 26900 acres/week. On the average, how many square meters of forest are burned down every

    asked on January 20, 2012
  89. Microbes and Society

    Every state has an official animal, flower, and/or tree, but one state has an official bacterial species named in its honor: Methanohalophilus oregonense. What is the state and decipher the meaning of the genus name? (Note: ense =” belonging to”). the

    asked on January 23, 2017
  90. Physics

    A circuit consisting of three resistance 12ohm, 18ohm and 36ohm respectively joined in parallel, and connected in series with the fourth resistance. The whole circuit is supplied at 60volts and it is found that the power dissipated in the 12 resistance is

    asked on July 8, 2019
  91. chemistry

    estimate the ph of an aqueous solution of each of the following compounds by indicating whether the ph is greater than 7 or less than 7 or about 7. H3PO4 Mg(OH)2 NaNO3 HNO3 NH3(aq) (NH4)2CO3 CO2 KC2H3O2 HC2H3O2 KCL

    asked on November 8, 2016
  92. trigonometry

    Find an exact value for csc 11pi/12 How do I do this? I change it to 1/(sin 11pi/12) but then I'm stuck what to do.. Thanks

    asked on August 20, 2016
  93. physics

    Two charges, -37 µC and +3 µC, are fixed in place and separated by 2.8 m. (a) At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. (Hint: The spot does not necessarily lie between

    asked on January 23, 2007
  94. physics

    Three charges are fixed to an x, y coordinate system. A charge of +12 µC is on the y axis at y = +3.0 m. A charge of -14 µC is at the origin. Lastly, a charge of +50 µC is on the x axis at x = +3.0 m. Determine the magnitude and direction of the net

    asked on January 23, 2007
  95. statistics

    Suppose you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information that you have. Your boss has asked you to put together a report showing the relationship between these two

    asked on November 5, 2014
  96. Social Studies

    1) How was South Carolina constitution of 1868 different from previous state constitutions? A. Women lost their right to own property. ** B. Representation was based on population alone. C. Countries and districts were organized into parishes. D.Education

    asked on March 1, 2016
  97. MEC

    two charges repel each other with a force of 0.1N when they are 5cm apart. Find the forces between the same charges when they are 2cm and 8cm apart.

    asked on October 24, 2012
  98. English

    ENGLISH HOMEWORK.. Need to write a antecedent for each Pronoun that is Capitilized in sentences.? Need to write a antecedent for each Pronoun that is Capitilized in sentences 1. Some of the Students brought THEIR lunches to the beach. 2. Ken took Meg home

    asked on May 13, 2012
  99. Chemistry

    At 25°C, K = 0.090 for the following reaction. H2O(g) + Cl2O(g) equilibrium reaction arrow 2 HOCl(g) Calculate the concentrations of all species at equilibrium for the following case. 1.3 mol pure HOCl is placed in a 1.6 L flask [HOCl]________

    asked on February 27, 2012
  100. Physics

    Driving in your car with a constant speed of 12 m s you encounter a bump in the road that has a circular cross-section. The radius of curvature of the bump is 35.2 m. At what speed must you go over the bump if people in your car are to feel "weightless"?

    asked on January 23, 2011


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