Most popular questions and responses by George
  1. Chemistry

    If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures Would the answer be 0.38

    asked on September 17, 2008
  2. chemistry

    Which of the following has the greatest buffer capacity? There are three separate problems below. 1. 0.40 M CH3COONa / 0.20 M CH3COOH 2. 0.40 M CH3COONa / 0.60 M CH3COOH 3. 0.30 M CH3COONa / 0.60 M CH3COOH Thanks!

    asked on July 17, 2010
  3. chemistry

    Current is applied to a molten mixture of CuF, ZnCl2, and AlBr3. What is produced at the cathode? a)F2 b)Al c)Cu d)Zn e)Cl2 f)Br2 What is produced at the anode? Same options as above.

    asked on May 29, 2012
  4. chemistry

    In the REDOX reaction in basic solution Zn-->Zn(OH)4+H2 I know that the first half reaction is 4H20+Zn-->Zn(OH)4 +4H+e but the second one is either 2e+2H2O--->H2+2OH (WHICH IS THE ANSWER GIVEN ON THE WORKSHEET) OR 2e+2H-->H2 I think both leads to the same

    asked on November 4, 2010
  5. AP Calculus AB Part 2

    The Riemann sum, the limit as the maximum of delta x sub i goes to infinity of the summation from i equals 1 to n of f of the quantity x star sub i times delta x sub i , is equivalent to the limit as n goes to infinity of the summation from i equals 1 to n

    asked on January 26, 2018
  6. physics

    The cheetah can reach a top speed of 114km/h (71mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50m in a straight line reaching a final speed of 91 km/h. a.) Determine the cheetah's average acceleration during the short

    asked on February 3, 2013
  7. Calculus

    A rectangular swimming pool is to be built with an area of 1800 square feet. The owner wants 5-foot wide decks along either side and 10-foot wide decks at the two ends. Find the dimensions of the smallest piece of property on which the pool can be built

    asked on October 25, 2008
  8. Physics

    A cube of wood with a density of 0.780 g/cm3 is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? (ρw = 1.00 g/cm3) a. 5.00 N b. 6.40 N c. 7.65 N d. 7.65 x 10^3 N

    asked on December 19, 2011
  9. calculus

    A rectangular box has a square base with an edge length of x cm and a height of h cm. The volume of the box is given by V = x2h cm3. Find the rate at which the volume of the box is changing when the edge length of the base is 12 cm, the edge length of the

    asked on January 17, 2015
  10. chemistry

    SiH3- planar or pyramidal geometric shape?

    asked on May 8, 2011
  11. Chem

    How many grams of Ni would be electroplated if a constant current of 7.2 amperes is passed through a solution of NiSO4 for 90.0 min?

    asked on March 19, 2013
  12. Pre calc

    The population of a Midwestern city decays exponentially. If the population decreased from 900,000 to 800,000 from 2003 to 2005, what will be the population in 2008? I thought it was 7542 but it is wrong can someone please help me thank you

    asked on March 9, 2017
  13. college chemistry

    . One possible use for the cooking fat left over after making french fries is to burn it as fuel. Formula (for cooking fat) = C51H88O6 Density = 0.94 g/ml ΔH°f = - 1310 kJ/mol. Write a balanced equation of the combustion of cooking fat (the products are

    asked on April 17, 2010
  14. physics

    Save Two children hang by their hands from the same tree branch. The branch is straight, and grows from the tree trunk at an angle of 27 degrees above the horizontal. One child, with a mass of 39 kg is hanging 1.50 m along the branch from the tree trunk.

    asked on November 17, 2014
  15. Social Studies

    I am having a hard time with economics - we just started in my social studies class. Can I have help with my homework, please? 1. What phrase best defines competition? (1 point) just one main buyer of a good or service just one main seller of a good or

    asked on November 2, 2012
  16. chemistry

    The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g) > 2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume of carbon monoxide that can be obtained from 3.39 x 102 L of methane and 1.70 x

    asked on October 4, 2014
  17. Chemistry

    What would be the whole name of 2-butene and hydroiodic acid. Or the diagram. h h Any help would be greatly appreciated.

    asked on November 19, 2008
  18. Physics

    The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find the tension FT in the

    asked on June 10, 2014
  19. math 11

    Michaela has up to $20 to spend on bottled water and orange juice for a group hike. It cost $2 for each bottle of water and $ 4 for each bottle pdf orange juice. write an inequality statement of this situation? 2x +4y< or equal to 20 Y < or equal to-1/2x

    asked on April 15, 2018
  20. Calculus

    The hypotenuse of a right triangle has one end at the origin and one end on the curve y=x^(7)e^(-7x) , with x greater than or equal to 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a

    asked on October 21, 2008
  21. Geometry

    The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the larger figure?

    asked on September 29, 2013
  22. chemistry

    The ionization constant Ka of an indicator HIn is 1.0x10^-6. The color of the nonionized form is red and that of the ionized form is yellow. What is the color of this indicator in a solution whose pH is 4.00? Thanks!

    asked on July 18, 2010
  23. science

    The orbital radii of four planets in our solar system are shown in the following table. Orbital Radii Planet Orbital Radii (AU) W 5.2 X 0.72 Y 1.0 Z 19.1 Which planet is likely to experience the highest temperature? W X Y Z I think it is B.x but I am not

    asked on May 10, 2018
  24. Physics

    A golf ball with an initial angle of 34 degrees lands exactly 240 m down the range on a level course. a.) Neglecting air friction, what initial speed would achieve this result? b.) Using the speed determined in item a, find the maximum height reached by

    asked on October 5, 2016
  25. College Chemistry

    H2C=C=CH2 molecule is linear, what are they hybridization states of the carbon atoms? draw diagrams to show sigma and pi bonds.

    asked on May 8, 2011
  26. chemistry

    When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?

    asked on October 5, 2014
  27. physics

    A man in a maze makes 3 consecutive displacements. His first displacement is 5.40m westward, and the second is 18.0m northward. At the end of his displacement he is back to where he started. Use the graphical method to find the magnitude and direction of

    asked on January 28, 2013
  28. Geometry

    A 5 foot tall woman stands 15ft from a statue. She must look up at an angle of 60 degrees to see the top of the statue. How tall is the statue?

    asked on September 25, 2013
  29. chemistry

    how to calculate the mass of hydrogen in 150.0 g of ethene

    asked on January 22, 2013
  30. Geometry

    A regular pentagonal solid prism has 9cm base edges. A larger, similar solid prism of the same material has 36cm base edges. How does each indicated measurement for the larger prism compare to the same measurement for the smaller prism? Find the volume and

    asked on September 29, 2013
  31. statistics

    From experience, an airline knows that only 80% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that fewer than 7 of them show up.

    asked on March 20, 2014
  32. Calculus

    According to the US Census, the world population P, in billions, is approximately P=6.342e^(0.011t); where t is in years since January 1, 2004. At what rate was the world's population increasing on January 1, 2005? Give your answer in millions per year. Is

    asked on November 5, 2008
  33. Physics

    A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor? (Round to the first decimal point and don't forget units.

    asked on December 19, 2011
  34. calculus inverted cone

    A container in the shape of an inverted cone has radius 6 ft and height 12 ft. It is being drained at 2〖ft〗^3/min. Find the rate of change of the height of the liquid in the cone when the height is 3 feet. The ratio of the radius to the height remains

    asked on November 11, 2014
  35. Statistics

    A maker of microwave ovens advertises that no more than 10% of its microwaves need repair during the first 5 years of use. In a random sample of 57 microwaves that are 5 years old, 13% needed repairs. At á=0.01, can you reject the maker’s claim that no

    asked on May 5, 2010
  36. earth science

    Select all of the answers that apply. Some rules to remember when reading topographic maps are _____. 1)the elevations of contour lines must always be whole number multiples of the contour interval. 2)the thin line separating two different rock units is a

    asked on April 7, 2010
  37. math

    The population of a colony of rabbits grows exponentially. The colony begins with 5 rabbits; 5 years later there are 310 rabbits. (a) Express the population of the colony of rabbits, P , as a function of time, t , in years. (b) Use the graph to estimate

    asked on March 13, 2018
  38. calculus

    The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr2. Find the instantaneous rate of change of the surface area with respect to the radius r at r = 2. (4 points)

    asked on January 16, 2015
  39. Physics Calculation

    The weight of an apple near the surface of the earth is 1N. What is the weight of Earth in the gravitational field of the apple?

    asked on May 14, 2011
  40. Calculus

    Show that f(x) = x^3 and g(x) = 200x^3 grow at the same rate.

    asked on May 4, 2018
  41. calculus

    If f(x) = ι(x2 - 8)ι, how many numbers in the interval 0 ≤ x ≤ 2.5 satisfy the conclusion of the mean value theorem? (4 points) Three Two One None

    asked on January 16, 2015
  42. Chemistry

    What is another name or diagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.

    asked on November 19, 2008
  43. Calculus

    A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5

    asked on November 12, 2008
  44. Math Word Problem

    At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By 6pm the bacteria are overcrowded and dry and their food is gone.At

    asked on November 9, 2008
  45. algebra

    a ladder is placed 5ft away from a house. the ladder comes up to 12ft on the side of the house. how long is the ladder?

    asked on February 23, 2017
  46. Physics

    A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J

    asked on March 8, 2014
  47. Calculus

    Hi, I missed school due to illness (and my school isn't very forgiving) so I would really appreciate some help answering these questions, tbh I have no idea how to do these (it was a short unit and I missed all of it) but If I just see how they are solved

    asked on March 18, 2019
  48. Global Studies

    All of the following affect climate EXCEPT a. vegetation b. elevation c. location d. wind patterns

    asked on March 27, 2014
  49. math

    Match the equation with the step needed to solve it. 1. 2m - 1 = 3m subtract m 2. 2m = 1 + m subtract 2 3. m - 1 = 2 subtract 1 4. 2 + m = 3 subtract 2m 5. -2 + m = 1 add 2 6. 3 = 1 + m add 1

    asked on January 14, 2010
  50. Geometry

    On September 3, 1970 a hailstone with diameter 5.6in fell at Coffeyville, Kansas. It weighed about 0.018Ib/in^3 compared to the normal 0.033Ib/in^3 for ice. About how heavy was this Kansas hailstone?

    asked on September 27, 2013
  51. Geometry

    Point Q is the midpoint of PS. Which of the following completes the statement

    asked on January 30, 2019
  52. accounting

    Prepare general journal entries to record the following transactions for the Harris Company. (The company uses the balance sheet approach for recording bad debts expense.) 2010 Dec. 31 Recorded Bad Debts Expense, $800 2011 Jan. 3 Wrote off Jal’s account

    asked on September 10, 2018
  53. Chemistry

    What is the complete redox reaction of KMnO4 against (NH4)2Fe(SO4)2

    asked on July 22, 2018
  54. English

    What does this mean "the cold gleam of the fanatic" It is in the story "The Sniper" by Liam O'Flaherty

    asked on November 18, 2015
  55. Calculus

    A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase

    asked on November 9, 2008
  56. Chemistry

    A 50.0 mL sample of 0.23 M propanoic acid, CH3CH2COOH, a weak monoprotic acid, is titrated with 0.14 M KOH. Ka of CH3CH2COOH = 1.4 multiplied by 10-5. What is the pH at equivalence point?

    asked on April 3, 2011
  57. Math

    You invest $500 at an annual interest rate of 6.75% compounded continuously. How long will it take y our money to double?

    asked on May 24, 2018
  58. calculus

    A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the

    asked on January 17, 2015
  59. Chemistry

    Butane,C4H10 , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00atm and 23 degrees Celsius , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o Any help would be

    asked on September 21, 2008
  60. Physics?

    the total mass-energy of one pound of anything is about how many joules

    asked on January 31, 2013
  61. Chemistry

    You have the alkane C7H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.

    asked on November 15, 2008
  62. Physics

    The average distance between Earth and the Sun is 1.5 ✕ 10^11 m. (a)Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second. (b)What is this speed in miles per hour?

    asked on August 28, 2018
  63. Calculus

    I was worried the last response in: ( would get lost so I just re-posted it here just in case: Thank you so much for including both methods on 2C

    asked on March 20, 2019
  64. Calculus

    Sorry to bother you so much but do you think you could check my answers for these two:

    asked on March 19, 2019
  65. Calculus

    What is the local linearization of e^x^2 near x=1? Is the answer 1+2x

    asked on November 14, 2008
  66. physics

    A hiker starts at his camp and moves the following distances while exploring his surroundings: 70.0m north, 2.75 x 10^2m east, 130m at an angle 30.0 degrees north of east, and 1.50 x 10^2m south. a.) find his resultant displacement from camp. (take east as

    asked on January 30, 2013
  67. adult education

    Briefly describe the cookie production process. 2. What are two ways that the company has increased productivity? Why did increasing the length of the ovens result in a faster output? 3. Do you think that the company is making the right decision by not

    asked on November 8, 2010
  68. Physics

    A child’s toy consists of plastic attached to a spring. The spring is compressed against the floor a distance of 1.48 cm, and the toy is released. The acceleration of gravity is 9.8 m/s2 . If the toy has a mass of 109 g and rises to a maximum height of

    asked on September 19, 2012
  69. Hard Calculus

    A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase

    asked on November 9, 2008
  70. chem 12

    consider the following equilibrium 2NOCl(g)--- 2 NO(g) + Cl2(g) Initally 1.00 mol of NO and 1.00 mol of Cl2 are placed in a 5.00L container. Calculate the initial concentrations of NOCl, NO and Cl2 NO= 0.20 mol/L Cl2= 0.20 mol/l NOCl=0 At equilibrium it is

    asked on March 8, 2016
  71. Calculus

    A rectangular beam is cut from a cylindrical log of radius 30 cm. The strength of a beam of width w and height h is proportional to wh^2. Find the width and height of the beam of maximum strength. Is the width 45 and the height 20.

    asked on October 26, 2008
  72. Physics Help

    A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy.

    asked on December 13, 2015
  73. Math

    Find the value of 21 - 18 ÷ 3 · 2. A)1 if it doesnt show A is 1 half - 2 B)2 C)9 D)18

    asked on January 7, 2010
  74. Physics

    A penny rests on top of a bowling ball. You give the bowling ball a slight bump and the penny slides off the frictionless, spherical surface as shown below. At what angle θ does the penny leave the surface of the bowling ball? (Hint: When the penny leaves

    asked on March 8, 2014
  75. Physics

    An unmarked police car traveling a constant 80 is passed by a speeder traveling 145 .Precisely 2.50 after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.80 , how much time passes before the police car

    asked on October 4, 2011
  76. Chemisty

    Alexander, who weighs 159 , decides to climb Mt. Krumpett, which is 5460 high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- bar contains 10 of fat, 40 of protein, and 50 of carbohydrates.Alexander

    asked on September 27, 2008
  77. java programming

    You need to provide more than a yes or no answer for this question. Consider both the selection sort and the bubble sort. If these algorithms will work with duplicates explain why they will still work. If they will not work, explain why they will not work.

    asked on July 29, 2006
  78. chem 12

    1.0 mol of each of the gases, CO, H20, CO2 and H2 are placed in a 2.00L container and allowed to reach equilibrium. It is found at equilibrium 0.40 mol of CO is present. Calculate the value of K eq for the system. C0(g) + H20(g)--- CO2(g) + H2(g) Intial

    asked on March 13, 2016
  79. Physics

    A small block slides along a track from one level to a higher level, by moving through an intermediate valley (see Figure). The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. Assume

    asked on December 26, 2013
  80. Physics (angular motion)

    The blades of a fan running at low speed turn at 230rpm . When the fan is switched to high speed, the rotation rate increases uniformly to 370rpm in 5.80s . Part A What is the magnitude of the angular acceleration of the blades? Part B How many revolutions

    asked on November 7, 2013
  81. Geometry

    A 5 foot tall woman stands 15 ft from a statue. She must look up at an angle of 60° to see the top of the statue. How tall is the statue?

    asked on September 20, 2013
  82. chem12

    for the equilibrium 2HI(g)--- H2(g) + I2 k eq = 8.0 2.0 mol of HI are placed in a 4.0 L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases. Inital 2HI 0.5mol/l H2 =0 I2=0 change 2HI= -2x

    asked on March 8, 2016
  83. Chemistry

    Butane, , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00 and 23 , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o

    asked on September 21, 2008
  84. Calculus

    (I know it looks like a lot but it's just 10 questions) (part 1 [It also explains my situation]: (If your willing to do this part along with part

    asked on March 18, 2019
  85. Global Studies (Please help)

    which of the following was neither part of the confederacy nor the union? a. Minnesota b. Texas c. Michigan D. Colorado

    asked on February 3, 2014
  86. Physics

    A long jumper leaves the ground at an angle of 20 degrees and travels a horizontal distanceof 7.0m before landing. What is the takeoff speed of the jumper? To be honest I really don't know how to solve it. A step-by-step explantion would be helpful.

    asked on October 5, 2010
  87. physics

    A 0.180 kg baseball, traveling 32.0 m/s, strikes the catcher's mitt, which recoils 13.0 cm in bringing the ball to rest. What was the average force (in newtons) applied by the ball to the mitt?

    asked on March 7, 2012
  88. Math

    What is the expression for "the difference between five times a number and twice that number"? A)5(2 - N) B)5N - 2N C)2N - 5N

    asked on January 7, 2010
  89. Geography

    The city of Urbania was designed by city planners to address the needs of both the city's businesses and its citizens. Single-family housing will be limited. Most people will live in multi-unit housing, such as apartments or condominiums. Businesses must

    asked on December 15, 2009
  90. Science

    Broad areas of folded rock layers that resemble an upside-down bowl are called? a)domes b)basins c)horsts d)monoclines

    asked on December 7, 2009
  91. Calculus

    A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the

    asked on November 11, 2008
  92. walter

    A positive charge of 1.5x10^-8 C experiences a force of 0.025 N to the left in an electric field. What are the magnitude and direction of the field?

    asked on March 8, 2012
  93. Science

    Where is this earthquake's epicenter? A)Tokyo, Japan B)Manila, Philippines C)Beijing, China D)Hong Kong, China

    asked on December 8, 2009
  94. Math

    Describe the cross sections formed as the plane intersects the interior of the sphere but moves away from the center

    asked on March 15, 2017
  95. Physics

    Lead spheres of masses 1.7 kg and 20.4 g whose centers are separated by 6.1 cm. Calculate the gravitational force between these spheres, treating each as a point mass located at the center of the sphere. The value of the universal gravitational constant is

    asked on February 9, 2016
  96. Chemistry

    The Ka values of H3PO4 are shown below. Ka1 7.5 multiplied by 10-3 Ka2 6.2 multiplied by 10-8 Ka3 4.8 multiplied by 10-13 What is the pH of a 0.14 M solution of Na2HPO4?

    asked on April 3, 2011
  97. Physics

    A 14.0 ohm resistor is made from a coil of copper wire whose total mass is 23.0 g. What is the diameter of the wire, and how long is it?

    asked on February 6, 2011
  98. Chemistry

    What is another name ordiagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.

    asked on November 18, 2008
  99. Calculus

    Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that (1) sin (1/x)=0 {Hint: Use the fact that sin(pi) = sin(2pi)=sin(3pi)=...=sin(npi)=0} (2) sin (1/x)=1 {Hint: Use the fact that sin(npi)/2)=1 if n= 1,5,9...} (3) sin

    asked on September 9, 2008
  100. Physics

    Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)

    asked on February 12, 2015


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