Most popular questions and responses by jenny
  1. Physics

    Hot air balloons float in the air because of the difference in density between cold and hot air. In this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. To do this, use the following variables

    asked on July 13, 2011
  2. Statistics

    Thank you!! A survey of an urban university (population of 25,450) showed that 750 of 1100 students sampled attended a home football game during the season. What inferences can be made about student attendance at football games? Using the 99% level of

    asked on December 19, 2007
  3. math

    A Dish TV satellite dish is the shape of a paraboloid. The dish is 36 inches wide, and 8 inches deep. How many inches should the receiver be located from the vertex for optimal reception? (round to the nearest thousandth)

    asked on October 15, 2017
  4. Chemistry

    Suppose that 0.650 mol of methane, CH4(g), is reacted with 0.800 mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance & Enthalpy of Form. (kJ/mol)

    asked on March 28, 2011
  5. history

    which describes a major obstacle nations encounter when dealing with rogue state such s north korea 1. the leaders of rogue states recognize no outside authority 2 a rogue states leadership may change without warning 3.a rogues state government secrets are

    asked on August 14, 2018
  6. History

    Advantages and disadvantages that ethnic neighborhoods offered to their residents? I previously did an essay of advantages and disadvantages of immigration to the U.S. and when I search online I am getting the same answers. So I am scared I answered one of

    asked on August 7, 2014
  7. chemistry

    how many grams of HNO3 can be produced if 225 grams of NO2 is mixed with 55.2 g of H2O? 3NO2 + H2O=2HNO3 + NO

    asked on January 24, 2010
  8. Physics

    A 50.0g ball of clay traveling east at 3.00 m/s collides and sticks together with a 50.0g ball of clay traveling north at 3.50m/s. What is the speed and direction of the resulting ball of clay?

    asked on March 7, 2013
  9. Physics

    Two 10-cm-diameter charged rings face each other, 20cm apart. The left ring is charged to -22nC and the right ring is charged to +22nC . What is the magnitude of the electric field E⃗ at the midpoint between the two rings?

    asked on September 1, 2014
  10. Physics

    What is the diameter of a 1.00 meter length of tungsten wire whose resistance is 0.32 ohm (electrical resistance)?

    asked on February 8, 2008
  11. Econ.

    In recent years, some policymakers have proposed requiring firms to give workers certain fringe benefits. For example, in 1993, President Clinton proposed requiring firms to provide health insurance to their workers. Let’s consider the effects of such a

    asked on December 4, 2006
  12. calculus

    Two positive numbers have a sum of 60. what is the maximum product of one number times the square of the second number? a) 3481 b) 3600 c) 27,000 d) 32,000 e) 36,000 So Idk if this is right, but I have .... x+y=60 p=xy^2 p=x(60-x)^2 P'=-2x(60-x)+(60-x^2)

    asked on December 14, 2010
  13. consumer math

    Joe McCain purchased 5 $1,000 bonds at 89. The bonds pay 6%. What was the cost of the bonds? $4,450 ? What was the total annual interest? What is the yield?

    asked on January 14, 2013
  14. geometry

    2. the dashed triangle is a dilation image of the solid triangle. what is the scale factor (1 point)

    asked on October 5, 2015
  15. Math PLEASE!

    Hi there, I need help solving a proof. I put all my answers in for the blank spaces, but number 4 I can't get. If someone could help that would be great. Thank you! I've been trying to figure this out for the past two days and I'm honestly freaking out. My

    asked on February 18, 2016
  16. physics

    A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward one another along a straight, level track. When they are 950m apart, each engineer sees the other’s train and applies the brakes. The brakes decelerate each train

    asked on September 18, 2006

    six neighbors share 4 pies equally. how much of a pie does each get? three brothers share 2 sandwiches equally. how much of a sandwich does each brother get?

    asked on January 13, 2015
  18. Chem II

    How many grams of ethylene glycol (C2H6O2) per kilogram of water are needed to give protection up to 120 °C in a car radiator?

    asked on February 12, 2013
  19. Chemistry

    At 35 degrees Celcius, K = 1.6x10^-5 for the reaction: 2NOCl 2NO + Cl2 If 2.0mol NOCl and 1.0mol Cl2 are placed into a 1.0-L flask, calculate the equilibrium concentrations of all species. Answer: [NOCl] = 2.0M [NO] = 8.0x10^-3 [Cl2] = 1.0M --------- What

    asked on March 30, 2011
  20. Physics

    A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 10.0 kg, travels 6.50 m up the conveyor belt at a constant speed without slipping. If the conveyor belt is inclined at a 60.0° angle,

    asked on July 14, 2013
  21. chemistry

    b. Methanol, CH3OH, which can be used as a fuel, can be formed by the reaction between carbon monoxide and hydrogen as depicted in the following balanced equation. 2H2 + CO ¨ CH3OH Suppose 356 g of CO and 65 g of H2 are mixed and allowed to react. (i)

    asked on December 28, 2011
  22. economics

    A profit-maximizing firm in a competitive market is currently producing 100 units of output. It has average revenue so $10, average total cost of $8 and fixed cost of $200. a. what is the profit? b. what is the marginal cost? c. what is its average

    asked on September 20, 2011
  23. Chemistry

    What mass of ammonia (NH3), is necessary to react with 2.1 x 1024 molecules of O2? 4 NH3 + 7 O2 = 6 H2O + 4 NO2?

    asked on November 16, 2017
  24. U.S government

    Which statement best expresses the meaning of the opening words of the U.S. Constitution, "We, the people..."? A. sovereignty is derived from the consent of the governed B. all citizens are guaranteed freedom of speech C. federal laws are subject to

    asked on August 11, 2010
  25. Math (check answers)

    Hi there, I need help solving a proof. I put all my answers in for the blank spaces, but number 4 I can't get. If someone could help that would be great. Thank you! Given: Triangle SVX is congruent to triangle UTX and Line SV is parallel to line TU. Prove:

    asked on February 18, 2016
  26. Chemistry

    How much heat is absorbed/released when 20.00 g of NH2 reacts in the presence of excess O2 to produce NO and H2O according to the following chemical equation: 4NH3 + 5O2 --> 4NO + 6H2O, deltaH= +1168 kJ. The answer is 342.9 kJ of heat absorbed. I want to

    asked on June 8, 2015
  27. Proportional Reasoning( Please Help Assignment Due

    Chef Potato's body has a cylinder in the middle and two half spheres that make up his bottom and head. He has the two dimensional shape measurements as follows: 20 cm in total length, 5 cm between the end of the cylinder and the top of the top sphere.

    asked on June 17, 2016
  28. algebra

    If events A and B are independent, P(A) = 0.62, and P(B | A) = 0.93, what is P(B)?

    asked on May 22, 2012
  29. Physics

    The Russell Traction System To immobilize a fractured femur (the thigh bone), doctors often utilize the Russell traction system illustrated in the figure. Notice that one force is applied directly to the knee, F_1,while two other forces, F_2 and F_3 are

    asked on October 2, 2009
  30. Statiatics

    A student ran out of time on a multiple choice exam and randomly guessed the answers for two problems. Each problem had 5 answer choices a, b, c, d, e and only one correct answer. What is the probability that she answered neither of the problems correctly?

    asked on January 31, 2015
  31. RMS Speed

    A gas is at 20°C. To what temperature must it be raised to triple the rms speed of its molecules? Ans: 2364oC I don't get how they got the answer. Please help!

    asked on April 16, 2012
  32. consumer math

    Lily Adams purchased a $1,000 bond at 70. The bond pays 4%. What was the cost of the bond? What was the annual interest? What is the yield (to the nearest tenth of a percent)?

    asked on January 14, 2013
  33. Social Studies

    Which of the following is an effect of the Agricultural Revolution in Middle America?

    asked on October 31, 2018
  34. algebra 2 help please

    7 girls audition for 12 roles in a school play. What is the probability that at least 2 of the girls audition for the same part?

    asked on May 21, 2012
  35. Math

    Given These Equations x+y=9.0 .50x+.20y=3.90 Find the values of X and Y.

    asked on July 14, 2012
  36. AP CHEM

    What is the pKa for the acid HA if a solution of 0.65 M HA and 0.85 M NaA has a pH of 4.75? ~~~I know you find the ph by doing -log of pka; how do you do the reverse when you have molarity? I am completely lost. :-(

    asked on March 23, 2016
  37. MATH

    Victor Malaba has a net income of $1,240 per month. If he spends $150 on food, $244 on a car payment, $300 on rent, and $50 on savings, what percent of his net income can he spend on other things?

    asked on December 11, 2013
  38. Chemistry

    Rearrange the titration calculation to find Mb in a solution. If I put 13.2 mL of NaOH and 0.3 mL of phenolphthalein in 25 mL of KHP, what is the Mb of the solution? The original solution of NaOh is 100 mL and is composed of 1.069e-15 moles of H+, 9.445e-2

    asked on August 2, 2016
  39. science

    How much heat in kcal must be added to 0.77 kg of water at room temperature (20°C) to raise its temperature to 50°C?

    asked on December 26, 2014
  40. IPC

    Explain whether the photons emitted by a bright light bulb are more energetic than those emitted by a dim light bulb of the same color. how does the color of the light bulb determine the amount of energy of the electromagnetic waves?

    asked on April 15, 2009
  41. consumer math

    Lily Adams purchased a $1,000 bond at 70. The bond pays 4%. What was the cost of the bond? What was the annual interest? What is the yield (to the nearest tenth of a percent)?

    asked on January 14, 2013
  42. chemistry

    Is anyone know the molecular weight of 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. i can't find it . Thanks

    asked on April 12, 2010
  43. Physics

    A flea is able to jump straight up about 0.49 m. It has been said that if a flea were as big as a human, it would be able to jump over a 100 story building! When an animal jumps, it converts work done in contracting muscles into gravitational potential

    asked on September 22, 2008
  44. accounting

    Deane Company issues $5 million, 10-year, 9% bonds at 96, with interest payable on July 1 and January 1.The straight-line method is used to amortize bond discount. Prepare the journal entry to record interest expense and bond discount amortization on July

    asked on March 29, 2010
  45. math

    A spotlight is attached to the ceiling 2 feet from one wall of a room and 3 feet from the wall adjacent. How many feet is it from the intersection of the two walls? a. 4 b. 5 c. 3 square root of 2 d. square root of 13 e. 2 square root of 3

    asked on January 14, 2011
  46. Math

    A bag contains 22 1\2 cups of flour. A recipe for pancakes uses 1 1/4 cups of flour. How many batches of pancakes can be made with one bag of flour?

    asked on March 17, 2015
  47. Chemistry

    1. Balance the following half reactions in basic solution. ClO3- (aq) ¨ ClO4- (aq) Zn (s) ¨ Zn2+ (aq) BrO3- (aq) ¨ Br- (aq) IO3- (aq) ¨ I2 (s) Sn2+ ¨ Sn4+

    asked on July 26, 2013
  48. mathematics

    Cand D are two observation posts on the same horizontal ground at the foot A of a vertical tower AB.the tower is 18m due north of D and 24m east of C.the angle of elevation of B from D is 35¡ã.calculate to three s.f the height AB,distance CD,angle of

    asked on June 4, 2016
  49. Math

    Aleka has a box for keepsakes that has a volume of 576 cubic inches. The length of the box is 12 inches and the width is 8 inches. What is the height of the box?

    asked on April 20, 2017
  50. Please check my work!

    I try to write a summary for Mañana de Sol. So, can anyone please check my grammar and vocabulary? Thank you! “Mañana de Sol” dos desconocidos se encuetran en el parque y, aunque al comienzo no se dan muy bién, terminan por siendo amigos. Los dos

    asked on February 10, 2010
  51. english

    i need help with chapter 10 and 11 sentence check 2

    asked on March 24, 2014
  52. Math(Please Help Assignment Due)

    The following is taken from a State of the Park Report for Banff National Park. Visitors Numbers Total Visitors: 2004= 3,135,727. 2005=3,164,906. 2006=3,281,435 Total visitor days: 2004= 7,453,465. 2005= 7,518,997. 2006= 7,784,044 Total visitors have

    asked on June 29, 2016
  53. Please Help, I Don't Know How To Do This

    Chef Potato's body has a cylinder in the middle and two half spheres that make up his bottom and head. He has the two dimensional shape measurements as follows: 20 cm in total length, 5 cm between the end of the cylinder and the top of the top sphere.

    asked on June 17, 2016
  54. Physics

    A skier swoops down a hill and over a ramp. She starts from rest at a height of 18m, leaves the ramp at an angle of 45 degrees, and just clears the snowman on her way down, making an angle of 30 degrees with the vertical as she does. Assuming that there is

    asked on June 17, 2014
  55. Math

    In Mathematics: how much interest will you have to pay for a credit card balance of $554 that is one month overdue if a 20% annual rate is charged?

    asked on October 11, 2010
  56. physics

    can someone please explain f1d1 = f2d2

    asked on February 21, 2012
  57. chemistry!

    An ideal gas has a volume of 3.0 L. If the number of moles of gas and the temperature are doubled, while the pressure remains constant, what is the new volume?

    asked on May 4, 2010
  58. geometry

    the vertices of a triangle are p(-7 -4),q(-7,-8),and r(3,-3).Name the vertices of the image reflected across the line y=x. the choices are A. P'(4,7),Q'(8,7),R'(3,-3) B. P'(4,-7),Q'(8-7),R'(3,3) C. P'(4-7),Q'(-8,-7),R(-3,3) D. P'(-4,7),Q'(-8,7),R'(-3,-3)

    asked on October 5, 2015
  59. Math

    Ryan has 3/4 cup of pudding. How many 1/6 cup servings of pudding can ryan make

    asked on May 10, 2016
  60. algebra

    Jane Investor purchased a $10,000 bond at 90. The annual interest is 5%.

    asked on January 14, 2013
  61. Physics

    Two electrons exert a force of repulsion of 0.96 N on each other. How far apart are they? The elemental charge is 1.602 × 10 −19 C .

    asked on February 17, 2012
  62. Chemistry

    14. What is the number of moles in 42 g of NaCl? A. 1.8 mol NaCl B. 0.72 mol NaCl C. 0.61 mol NaCl D. 1.2 mol NaCl I'm sorry, I have no idea what I'm doing here.

    asked on August 15, 2013
  63. Science

    Compare and contrast sedimentary rocks that have a granular texture with sedimentary rocks that have a nongranular texture.

    asked on November 3, 2007
  64. Math

    a carpenter needs to buy either an 8 foot or a 10 foot piece of wood that will be cut into three pieces. these pieces will be 4 3/4 feet, 1 5/6, and 2 2/3 feet long. what length of wood should the carpenter buy?

    asked on February 22, 2016
  65. statistics

    In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL)

    asked on December 13, 2014
  66. math

    There are 10 children (aged 1 to 10 years) who have equal amounts of money. In the first transaction the eldest child gives one rupee to every child younger to him. In the second transaction, the second eldest child gives one rupee to every child younger

    asked on November 17, 2014
  67. Grammar Please hurry please

    Identify the words that correctly complete the following sentence. If none of the choices are correct, choose "none of the above." In a sentence with a compound verb, each verb (Points : 1) may have a different subject must have the same subject may not

    asked on August 27, 2013
  68. chemistry

    Given 20g of benzoic acid contaminated with 0.4g of salicytic acid. 1)Determine the volume of hot water required to dissolve the mass of acid. 2)Calculate the mass of benzoic acid which participates when the solution is cooled to 20°C. Deduce. 3)Calculate

    asked on October 21, 2015
  69. math 2

    judith has a necklace with a mass of 65.736 grams. what is the mass of her necklace rounded to the nearest tenth?

    asked on April 30, 2014
  70. Spanish

    I try to write a summary for Mañana de Sol. So, can anyone please check my grammar and vocabulary? Thank you! “Mañana de Sol” dos desconocidos se encuetran en el parque y, aunque al comienzo no se dan muy bién, terminan por siendo amigos. Los dos

    asked on February 10, 2010
  71. Physics

    The 22 cm diameter disk in the figure below can rotate on an axle through its center. At the end of this problem, you will calculate the magnitude and direction of the net torque about the axle when F = 22 N. The net torque is just the sum of the

    asked on October 28, 2014
  72. Chemistry

    Which cannot be broken down chemically or physically into a simpler substance between sugar, salt, seawater, and copper?

    asked on September 20, 2012
  73. Trigg

    In a predator/prey model the predator population is modeled by the function y=1000 sin (2t) +400. What is the smallest population according to this model?

    asked on March 17, 2014
  74. physics

    A small ball rolls horizontally off the edge of a tabletop that is 1.2 m high. It strikes the floor at a point 1.52m horizontally away from the edge of the table. a) How long is the ball in the air? b) What is the speed at the instant it leaves the table?

    asked on October 24, 2006
  75. motion problem (please check)

    A 8000N car is traveling 12 m/s along a horizntal road when the brakes are applied. The car skids to a stop in 4.0s. How much kinetic energy does the car have. my work: W= 8000N/9.18m/s mass= 815.49 kg Kinetic energy= (1/2mv^2-1/2mv^2) kinetic energy=1/2

    asked on November 6, 2006
  76. physics

    Find the resultant of the following two displacements; 2.0 m 40 degrees 4.0 meters at 127 degrees. the angles are taken relative to the x-axis

    asked on September 5, 2016
  77. Chemistry

    Portland cement contains some SiO2. Calculate the mass percent composition of silicon in this compound.

    asked on October 4, 2012
  78. Physics

    An object falling under the pull of gravity is acted upon by a frictional force of air resistance. The magnitude of this force is approximately proportional to the speed of the object, which can be written as f = bv. Assume b = 19 kg/s and m = 59 kg. What

    asked on September 22, 2008
  79. Chemistry

    A water sample saturated in CaF2 has Ca2+ of 115 ppm (115g Ca2+ per 10^6g water sample). What is the F- ion content of the water in ppm?

    asked on March 5, 2011
  80. Calc-Math

    The graphs of the function f (given in blue) and g (given in red) are plotted above. Suppose that u(x)=f(x)g(x) and v(x)=f(x)/g(x) Find each of the following:u(x) and v(x)..

    asked on May 26, 2016
  81. algebra 2

    What is the 16th term in the following geometric sequence? 5, –10, 20, –40, 80, ...

    asked on May 21, 2012
  82. chemistry

    The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for

    asked on March 12, 2012
  83. Math

    Write a phrase for each expression 7hb

    asked on August 23, 2011
  84. Physics

    Please help me answer the question below and also show equations and steps of how you came to your answer. Thank you 1. The electron in a hydrogen tom is in the first excited state, when the electron acquires an additional 2.86eV of energy. What is the

    asked on September 11, 2008
  85. Chemistry

    A 0.490 M solution of an unknown monoprotic weak acid, HA, is 2.80% ionized. What is the value of Ka for HA?

    asked on April 5, 2010
  86. Math3( Please Help Assignment Due)

    80 U2 songs (in seconds) were selected at random. Assume that the data is normally distributed and that the bands entire collection of songs has a mean and standard deviation equal to those calculated(mean=289.7 or 290, standard deviation= 76.8 or 77).

    asked on June 27, 2016
  87. chemistry

    How many valence electrons are there in BrF3?

    asked on October 1, 2009
  88. Math(Please Help Assignment Due Tomorrow)

    From the length(in seconds) of 80 randomly chosen U2 songs, the mean determined was 289.6986295 and standard deviation was 76.82292002. Assume that the data is normally distributed and that the bands entire collection of songs has a mean and standard

    asked on June 23, 2016
  89. physics

    A stone is thrown vertically upward. On its way up it passes point A with speed, v and point B, 3 m higher than A, with speed 1/2v. Calculate a) the speed v and b) the max height reached by the stone above point B. I can't find the equation You need to

    asked on September 17, 2006
  90. Math

    Hello! I have been learning about proving identities and can do simple ones but lately I have been really struggling. I am currently stuck on this problem. cos(A-B)/tan(A)+cot(B) = sin(B)/sec(A) I managed to get to: cosAcosB-sinAsinB/(sinA/cosA) +

    asked on April 23, 2019

    1) Which of these is a rational number? a. Pi b. square root 3 ****** c. square root 2 d. 1.3 (the # 3 has a line at the top) 2) Which of the following sets contains 3 irrational numbers? A. square root 120, n, square root 3 ****** b. - square root 256,

    asked on February 12, 2014
  92. college algebra word problem

    An open box is made from a square piece of material 24 inches on a side by cutting equal squares from the corners and turning up the sides. Write the Volume V of the box as a function of x. Recall that Volume is the product of length, width, and height.

    asked on October 24, 2008
  93. Statistics

    The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's

    asked on January 12, 2015
  94. Math

    The circular rug is placed on a square floor. The rug touches all four walls. How much of the floor space is not covered by the rug? The square floor is 14 feet for length and width.

    asked on March 13, 2011
  95. Math

    A basketball player with a free throw shooting percentage of 60% gets fouled and goes to the line to shoot two free throws. What are the odds in favor of her making her first shot?

    asked on October 11, 2009
  96. daily language review

    analogies. eighteen:even:: thirty-three: I don't understand this question?

    asked on September 17, 2008
  97. Statistics

    The seasonal output of a new experimental strain of pepper plants was carefully weighed. The mean weight per plant is 15.0 pounds, and the standard deviation of the normally distributed weights is 1.75 pounds. Of the 200 plants in the experiment, how many

    asked on December 19, 2007
  98. Psychology

    Which research method is BEST at explaining behavior (as opposed to simply describing it)?

    asked on June 11, 2016
  99. Math: Reiny

    I already posted this question, and Reiny had a question about the question. How many square units are in the region satisfying the inequalities y>=(x) and y

    asked on December 3, 2014
  100. physics

    Charge of uniform surface density (0.2 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2 m.

    asked on October 3, 2011


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