Most popular questions and responses by Jojo
  1. Chemistry

    16. You have a series of four chemical reactions (1--> 2 --> 3 --> 4). How do you calculate the H2 if you know the other H values? H2 = (H1)(H3)/(H4) H2 = H4 (H1 + H3) H2 = H1 + H3 + H4 H2 = H1 + H3 H4

    asked on April 10, 2012
  2. Math

    Marcus bake loaf of bread of banana bread for a party he cut the loaf into equal size . At the end of the party there were 6 pieces left . Explain how you can find the number of pieces in the whole loaf if Marcus told 1/3 of the loaf was left

    asked on March 10, 2017
  3. Chemistry

    17. You have the following equations: 2S (s) + 3O2 (g) 2SO3 (g), H = 792 kJ 2S (s) + 2O2 (g) 2SO2 (g), H = ? 2SO2 (g) + O2 (g) 2SO3 (g), H = 198 kJ What is the missing H?

    asked on April 10, 2012
  4. Math HELPP!!!!

    as a part of a geometry assignment john drew an equilateral triangle. which of the following dimensions could reprent the side length of the triangle john drew? 10,11,12 13,15,17 16,18,21 17,17,17•• Correct me!!

    asked on February 16, 2016
  5. physics

    A spherical bowling ball with mass m = 4.1 kg and radius R = 0.116 m is thrown down the lane with an initial speed of v = 8.9 m/s. The coefficient of kinetic friction between the sliding ball and the ground is ¦Ì = 0.34. Once the ball begins to roll

    asked on March 18, 2013
  6. Linear Approximation

    Use linear approximation, i.e. the tangent line, to approximate 1/0.104 as follows: Let f(x)=1/x and find the equation of the tangent line to f(x) at a "nice" point near 0.104 . Then use this to approximate 1/0.104 . L(x)=f(a)+f'(a)(x-a)...i think. You're

    asked on October 14, 2006
  7. Math PLZZZ HELPP MEE!!!

    the area of the parallelogram. Quadrilateral top: 5 cm side: 14 cm length: 12 cm *38 cm2 *60 cm2 •• *70 cm2 *168 cm2 3. Find the perimeter of the parallelogram. Quadrilateral top: 10.8 ft side: 5.1 ft length: 2.3 ft *15.9 ft *24.84 ft *31.8 ft ••

    asked on February 17, 2016
  8. Math. PLZZZ HELP ME!!!

    Jackson made a poster in the shape of a quadrilateral. Opposite sides of the poster are congruent and parallel. Which of the following names the shape of Jackson’s poster? A.square B.rhombus C.rectangle D.trapzoid•• Correct me

    asked on February 16, 2016
  9. Chemistry

    12. In a calorimeter, 10 g of ice absorbs heat with an enthalpy of fusion of 334 J/g. What is the heat absorbed? q = mCHf I am having a lot of trouble on this type of problem in chem. Help and an explanation would be greatly appreciated. Thank you.

    asked on April 10, 2012
  10. chemistry

    If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? Ok i narrowed it down to either 10 or 30...but im rly confused so if u could help it wuld be grea 80 40 1 min 20 2 min

    asked on March 4, 2007
  11. math

    Certain investments compound interest at different intervals. What effect does the size of the compounding interval have on the yield of the investment?

    asked on June 30, 2014
  12. Social Studies

    The principle of _____ in the U.S. Constitution means that the power of each branch of government is limited by powers of other branches. The principle of _____ means that power is distributed between state and national governments. PLEASE HELP ME!!!!!!

    asked on April 22, 2019
  13. physics 1

    The base of a pyramid covers an area of 13.0 acres (1 acre = 43,560 ft2) and has a height of 481 ft. If the volume of a pyramid is given by the expression V = (1/3)bh, where b is the area of the base and h is the height, find the volume of this pyramid in

    asked on January 21, 2016
  14. physics

    When a driver presses the brake pedal, his car stops with an acceleration of -8.7 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 10 m/s?

    asked on June 11, 2015
  15. Math HELPP!!

    Eric Drew and up to's triangle. Which of the following could be true for Eric's triangle. A: all three angles have equal measures B: possible angle measures of the triangle are 92, 48, and 40•• C: two of the angles are equal, and the third angle has a

    asked on February 16, 2016
  16. English

    We laughed at the colorful ball. Is this sentence structurally ambiguous?

    asked on February 8, 2012
  17. physics

    A centrifuge in a medical laboratory rotates at an angular speed of 3,550 rev/min. When switched off, it rotates through 54.0 revolutions before coming to rest. Find the constant angular acceleration (in rad/s2) of the centrifuge.

    asked on March 25, 2016
  18. chemistry

    The partial pressure of O2 in your lungs varies from 25 mm Hg to 40 mm Hg. What mass of O2 can dissolve in 1.0L OF water at 25.0oC when the O2 partial pressure is 40. mm Hg?

    asked on August 24, 2014
  19. Stat

    when you are comparing two sets of data, and one set is strongly skewed and the other is symmetric, which measures of the center and variation should you choose for the comparison?

    asked on September 14, 2014
  20. chemistry

    A 35.0g sample of ethylene glycol is dissolved in 500.0g of water. The vapor pressure of water at 32C is equal to 35.7mm Hg. What is the vapor pressure of the water-ethylene glycol solution at 32C?

    asked on August 24, 2014

    Which Enlightenment thinker wrote that people in society are bound to one another by an implicit 'social contract'? A. Voltaire B. Marie Arouet C. Jean-Jacques Rousseau D. Thomas Paine

    asked on February 3, 2016
  22. history

    How were the Spanish able to conquer two great empires with only a handful of soldiers? First, the Spanish had superior military equipment. They were protected by steel armor and had guns. The Aztecs and Incas relied on clubs, bows and arrows, and spears.

    asked on November 2, 2017
  23. physics

    In a circus performance, a large 5.0 kg hoop of radius 3.0 m rolls without slipping. If the hoop is given an angular speed of 3.0 rad/s while rolling on the horizontal and allowed to roll up a ramp inclined at 10° with the horizontal, how far (measured

    asked on April 2, 2016
  24. algebra

    a building in a city has a rectangular base. the lenght of the base measures 70 ft less than twice the width. the perimeter of this base is 820 ft.

    asked on January 23, 2012
  25. Stat

    1) one indicator of a outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. (a) if a data set has mean 70 and standard deviation 5, is 80 a suspect outlier? be sure to work that explains your answer

    asked on September 14, 2014
  26. American History

    Check my answers? 1. In what way was the government of ancient Athens different from the united states A) Athens was a direct democracy in which citizens ** B) Athens was an oligarchy ruled by the wealthy members of the council of five hundred C) Athens

    asked on October 17, 2016
  27. Art

    Which traits is not symbolized by chinese dragons? Wisdom Benevolence Evil Adaptability •• Correct me

    asked on February 17, 2016
  28. chemistry

    A scientist measures the standard enthalpy change for the following reaction to be -172.4 kJ : 2SO2(g) + O2(g) 2SO3(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of SO2(g) is

    asked on March 7, 2015
  29. Math PLZZ HELP ME!!

    Can someone please explain me how to construct a perpendicular bisector!

    asked on February 16, 2016
  30. chem

    at a depth of 100m underwater the water pressure is equal to 10 atm of pressure. what is the partial pressure of N2 at a pressure of 10 atm?

    asked on August 25, 2014
  31. chem 111

    What is the molarity of a solution of 10.0% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.

    asked on August 26, 2008

    Mens shirt sizes are determined by neck sizes. suppose the mens nexck sizes are approximatley normally distributed with mean 15.7 inches and standard deviation 0.7 inch.retailer sells men shirts in S,M,L,XL where the shirt sizes are defined in the table

    asked on December 20, 2011
  33. chemistry

    The vapor pressure of ethanol is 54.68 mm Hg at 25oC. How many grams of chlorophyll , C55H72MgN4O5, a nonvolatile, nonelectrolyte (MW = 893.5 g/mol), must be added to 207.6 grams of ethanol to reduce the vapor pressure to 53.60 mm Hg ? ethanol = CH3CH2OH =

    asked on August 26, 2014
  34. math

    explain how you would write the number that is 2 tens more than 53?

    asked on September 27, 2012
  35. Social Studies

    1. A photograph shows a multiple-story stone building with several tall openings. It shows that the openings have rounded top edges, and that they are framed by pillars. Which elements of this building reflect architectural developments during the

    asked on February 11, 2019
  36. science

    how do scientists explain the fact that some landforms that are far apart and separated by oceans appear to be related?

    asked on December 5, 2018
  37. 4gr math

    write 7026 in expanded form. then use words to the number

    asked on March 2, 2010
  38. chemistry

    The concentration of CO2 in an unopened soda can is 0.0506 m at 25 C. What is the partial pressure of CO2 gas in the can?

    asked on August 24, 2014
  39. physics

    A playground merry-go-round of radius 2.00 m has a moment of inertia I = 255 kg·m2 and is rotating about a frictionless vertical axle. As a child of mass 25.0 kg stands at a distance of 1.00 m from the axle, the system (merry-go-round and child) rotates

    asked on April 2, 2016
  40. physics

    A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.

    asked on January 31, 2016
  41. Physics

    two converging lenses placed L1=20 cm apart. the focal lengths are f1=10 cm and f2=20cm 1) where is the final image located for an object that L2=30cm infront of the first lens? 2)what is the total magnification of the lens system? *diagram*

    asked on April 27, 2010
  42. s. economics

    Brooke and Georgia are neighbors. Each have 40 hours per week. Brooke needs 5 hours to paint a beautiful picture and 2 hours to make a picture frame. Georgia takes 8 hours to paint an equally beautiful picture and 4 hours to make a picture frame. What two

    asked on August 31, 2015
  43. Fundamentals of Electricity

    The box-like Gaussian surface of Fig. 1 encloses a net charge of +24.0ε0 C and lies in an electric field given by N/C, with x and z in meters and b a constant. The bottom face is in the xz plane; the top face is in the horizontal plane passing through y2

    asked on November 30, 2009
  44. Art

    according to egyptian mythology horus son Kebehsenuef fit who has the head of a hawk. what characteristic might make Kebehsenuef fit for the job of watching a dead mummy vital organs? A kind and caring heart The keen eyes of a bird of pray Ingenuity A

    asked on February 16, 2016
  45. physics

    An air puck of mass m1 = 0.24 kg is tied to a string and allowed to revolve in a circle of radius R = 1.4 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of m2 = 1.3 kg is tied

    asked on March 25, 2016
  46. algebra

    Give an example of an open equation? my answer is, x + 4 = 7 Until the value of x is found, it is unknown whether the equation is true or false. am i right?

    asked on November 6, 2017
  47. physics

    The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15

    asked on April 2, 2016
  48. math

    washington school cost about $12,350,000 to build. use words to write that amount of money. 24. two factors of 16 are 1 and 16 beacuse 1*16= 16. find three more factors of 16.

    asked on November 4, 2010
  49. Chemistry

    For my homework the question is... What is the half life of polonium 214 if a 1 gram sample decays to 31.25mg after 820 seconds? Im not sure how you arrive at the answer, my friend says the answer is 5 but were not sure how to do it..thanks for any help u

    asked on March 4, 2007
  50. Social Studies

    explain whether conflict was unavoidable in Colombia. Why or why not? i don't understand.

    asked on May 20, 2015
  51. math

    Find the largest angle for which sine and tangent agree to within two significant figures. Please explain ^_^

    asked on August 28, 2009
  52. Art

    Which of the best definitions of personification? Giving animals and objects human characteristics•• Developing new characteristics of Personality Giving yourself the characteristics of someone else Giving human characteristics of animals Correct me if

    asked on February 16, 2016
  53. physics

    A marble is flicked horizontally off a desk with a speed of 3.1 m/s. If it takes the marble 0.8 seconds to hit the ground, how far from the desk does it land?

    asked on June 10, 2015
  54. math

    a ship leaves point A and travels 60 miles due east, then travels northward 59 degrees to point C, and travel 60 miles to point C, find the distance from point A to point C

    asked on May 14, 2015
  55. Chem 10

    Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter the correct number of significant figures. (2.700e2 cm)3 / (1.20e3 cm)2 Can't understand how many sig figs.

    asked on January 18, 2011
  56. math

    a quarter after four in the afternoon in digital form

    asked on September 29, 2010
  57. Algebra 2

    Evaluate the function when x=1. f(x)=4x-2. Write the input and output as a set of ordered pairs, and identify the domain and range of the ordered pair. (6 points) Ordered Pair: Domain: Range: Write an equation of direct variation that passes through the

    asked on December 3, 2016
  58. chemistry

    nitrosyl bromide, NOBr is formed from NO and Br2-. Experiments show that this reaction is second order in NO and first order in Br2. what is the rate equation for this reaction?

    asked on September 3, 2014
  59. math

    how often does a leap year occur? what are al the prime numbers less then 12. what is the eighth multiple of 32? is the last digit of the multiples if 4 odd or even? what are the six factors of 12? what are the factors of 16. two factors of 20 are 1 and

    asked on November 9, 2010
  60. managerial finance

    Completed all answers except the last one and I am stuck. Can someone please show me how to solve? I can't figure it out and I would like to have the steps so I can learn how to solve. Thank you! Jiminy's Cricket Farm issued a 30-year, 7.2 percent

    asked on November 24, 2015
  61. math

    100 eighth grade students were interviewed about their favorite subject at school. 45 said Math, 70 said English, and 5 said neither. Using a Venn diagram, how many said both?

    asked on March 10, 2014
  62. math

    Multiplying 2.1 and the number r results in 6.174. What is the value of r? Drag and drop the correct number into the box so that the equation is true.

    asked on January 8, 2019
  63. pysics

    A 50.0-kg child stands at the rim of a merry-go-round of radius 1.65 m, rotating with an angular speed of 3.00 rad/s. (a) What is the child's centripetal acceleration? m/s2 (b) What is the minimum force between her feet and the floor of the carousel that

    asked on March 25, 2016
  64. Help please!!health

    After a meal at a child care center ,the left over hot food that has been in serving bowls that have been on the table should be: a.chilled, refrigerated and used at another meal b.reheated, cooled and frozen for later use c.discarded d.heated in a

    asked on December 13, 2012
  65. Help Please!! Health

    Which one of the following major concepts is NOT included in the conceptual framework on which education nutrition is based? a.nutrition is how the body uses food is composed of nutrients required for health c.every person needs a variety of

    asked on December 13, 2012
  66. Maths

    Tan theta = 5/12 find the value of cosec theta

    asked on May 18, 2019
  67. history

    What is the mayflower compact? A. a long-term treaty for trade routes with the duch tea company B. a formal method to establish systematic order on the pilgrams C. an economic agreement to freely make and sell goods to the british D. a formal agreement by

    asked on November 3, 2017
  68. physics

    A 1400-N uniform boom at ϕ = 70.0° to the horizontal is supported by a cable at an angle θ = 20.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2250 N hangs from its top. (a) Find the

    asked on April 2, 2016
  69. math

    Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does not change. C. A particle

    asked on April 30, 2007
  70. history

    French took the lead in colonizing the upper Midwest region. From the early 16th century on, French soldiers, missionaries and fur traders left their slight mark upon the St. Lawrence Valley, the upper Great Lakes and points west. For the early French

    asked on November 3, 2017
  71. Chemistry

    8) ( 1 point) What is the maximum number of grams PH₃ that can be formed when 3.4 g of phosphorus reacts with 4 grams of hydrogen to form PH₃? P₄ (g) +6H₂ (g) → 4PH₃ (g) * 3.7 g 6.8 g 45 g 270 g 10. Lead nitrate can be decomposed by heating.

    asked on March 23, 2017
  72. chemistry

    calculate the Henry's law proportionality constant for N2? partial pressure at 1 atm=0.78 atm solubility at 1 atm= 5.3 x 10^-3 mol/L

    asked on August 25, 2014
  73. physics

    A rotating wheel requires 6.00 s to rotate 27.0 revolutions. Its angular velocity at the end of the 6.00-s interval is 97.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel?

    asked on March 25, 2016
  74. algebra

    Give an example of an open equation? my answer is, x + 4 = 7 Until the value of x is found, it is unknown whether the equation is true or false. am i right?

    asked on November 6, 2017
  75. Math

    Julie owns a video store. Her monthlyexpenses, including rent, average $1,185. This year she made $34,620 in revenue. What is the difference between her average monthly revenue and her average monthly expenses? HELP

    asked on April 29, 2011
  76. 4gr math

    an adult cheetah weighs about 130 pounds. an adult mountain lion weighs about 170 pounda. a student estimates that a mountain lion weighs about twice as much as a cheetah. is the estimate reasonable? explain why or why not

    asked on March 8, 2010
  77. math

    leah wants to put square floor tiles that measure one foot on each side in a room that is 9 feet and 9 feet wide. How many floor tiles will leah need? is your answer reasonable? explain why

    asked on March 2, 2010
  78. Language Arts

    How do you know squeaky won't let gretchen win in Raymond's Run

    asked on September 27, 2017
  79. physics

    Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24

    asked on March 25, 2016
  80. Art

    according to egyptian mythology horus son Kebehsenuef fit who has the head of a hawk. what characteristic might make Kebehsenuef fit for the job of watching a dead mummy vital organs? A kind and caring heart The keen eyes of a bird of pray •• Ingenuity

    asked on February 17, 2016
  81. economic

    1 THE COPPERBELT UNIVERSITY SCHOOL OF BUSINESS BSP 110 PRINCIPLES OF ECONOMICS 2015 ASSIGNMENT DUE DATE: 4th January 2016 at 10am QUESTION A manufacturing firm in Kitwe has a normal demand curve given by Q = 5,000 – 100P and its total cost curve in the

    asked on January 6, 2016
  82. math

    use digits to write four hundred seventy-five thousand three hundred forty-two. then circle the digit in the ten-thousands place

    asked on March 2, 2010
  83. physics

    A jet plane lands with a speed of 81 m/s and can accelerate at a maximum rate of −5.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? (b) Can this plane land on a

    asked on January 31, 2016
  84. Chemistry

    1. What would be the effect on the reaction rate if the [O2] were doubled? 2. What would be the effect on the reaction rate if the pressure on the reaction were doubled? 3. Assume the reaction is reversible and at equilibrium. What shifts in the

    asked on March 25, 2015
  85. college chemistry

    An electrical heater is used to add 19.50 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 4.50°C. When 1.75 g of butanol (C4H9OH) is burned in the same calorimeter, the temperature increases by 14.58°C.

    asked on October 16, 2010
  86. chemistry

    Use the concepts of effective nuclear charge, shielding, and n value of the valence orbital to explain the trend in atomic radius as you move across a period in the periodic table.

    asked on September 19, 2010
  87. Algebra


    asked on August 1, 2008
  88. gtuc


    asked on February 26, 2016
  89. Science

    In the ocean, there are area's where there are very few living things. _______ is the term that when this happens to a natural area.

    asked on April 8, 2015

    1- the vinegar soltion sold in the store is about 5% acetic acid. Assuming that the solution has a density of 1.01 g/mL, calculate the pH of vinegar.

    asked on May 20, 2013
  91. math

    8. in the 2004 presidentail election, 4651 residents of the state of rhode island voted for candidate ralph nader. round that number of residents to the nearest thousand, to the nearest hundred, and to the nearest ten.

    asked on November 4, 2010
  92. chemistry

    If a 0.01M Mn(NO3)2 solution has an ammonia concentration of 6.0M, would a precipitate form? Calculate the ion product and compare to Ksp.

    asked on July 8, 2015
  93. geometry

    Adelina is creating a piece of art that is in the shape of a parallelogram. its dimensions are 35 inches by 28 inches and one angle is 80 degrees. find the lengths of both diagonals.

    asked on February 21, 2012
  94. accounting

    Bryan company budgets sales of 1,800,000, fixed costs of 1,000,000 and variable costs of 1,080,000. what is the contribution margin ratio for Bryan Company

    asked on February 15, 2012
  95. science-biology

    name two processes for which DNA is responsible for what are the three components to a DNA nucleotide

    asked on March 19, 2009
  96. algebra

    PLEASE HELP ITS URGENT Pizza costs $1.50 per slice. Use a table and an equation to represent the relationship between the number of slices of pizza bought and the total cost.

    asked on November 6, 2017
  97. Science

    How should I prepare for a field study and what should I do if there's an accident?

    asked on November 1, 2017
  98. math

    While working on the roof of his house, John leans a 15 foot ladder against a second story window. If the distance on the ground between the base of the ladder and the house is nine feet, at what height does the ladder reach the second story window? In

    asked on February 8, 2017
  99. physics

    A person bending forward to lift a load "with his back" (Figure (a)) rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force

    asked on April 2, 2016
  100. physics 1

    A ladder 8.70 m long leans against the side of a building. If the ladder is inclined at an angle of 69.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?

    asked on January 21, 2016


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