Most popular questions and responses by Jennifer
  1. Physics

    An engineer in a locomotive sees a car stuck on the track at a railroad crossing in front of the train. When the engineer first sees the car, the locomotive is 210 m from the crossing and its speed is 26 m/s. If the engineer’s reaction time is 0.62 s,

    asked on September 15, 2010
  2. Physics

    You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. The soccer ball is kicked at 41° from the edge of the building with an initial velocity of 21 m/s and lands 59 meters away from the wall. How

    asked on October 10, 2013
  3. Chemistry

    What is the name of the product formed by the reaction of propylide ion and 2-chloropropane? I'm having problem because I don't know the formula of propylide ion.

    asked on June 5, 2008
  4. Calculus

    An OPEN box has a square base and a volume of 108 cubic inches and is constructed from a tin sheet. Find the dimensions of the box, assuming a minimum amount of material is used in it's construction. HINT: the goal is to minimize the surface are of the

    asked on May 14, 2013
  5. Chemistry


    asked on March 7, 2017
  6. Math

    Radioactive​ uranium-235 has a​ half-life of about 700 million years. Suppose you find a rock and chemical analysis tells you that only one sixteenth of the​ rock's original​ uranium-235 remains. How old is the​ rock?

    asked on September 25, 2018
  7. Math

    Three individuals form a partnership and agree to divide the profits equally. X invests $4,500, Y invests $3,500 and Z invests $2,000. If the profits are $1,500, how much less does X receive than if the profits were divided in proportion to the amount

    asked on April 25, 2012
  8. Science

    PLEASE HELP Science Test Friday Study Guide? I have 1 to 22 already but I am stuck now I have to have this completed and correctly for my study guide. I have a C right now I need an A on this test to bring it up to a B or I stay on restriction please help

    asked on October 26, 2010
  9. physics

    An electron ( mass = 9.11×10−31 kg) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.85 cm away. It reaches the grid with a speed of 2.95×10^6 m/s . (You can ignore the

    asked on May 19, 2012
  10. math help

    I am a closed shape made of 6 line segments. I have 2 angles less than a right angle and no right angles. What shape am I? Draw an example in the workspace.

    asked on March 19, 2014
  11. college chemistry

    When ammonium carbonate decomposes, what would happen to a glowing splint in the presence of the gases that are evolved. Explain

    asked on April 3, 2011
  12. chemistry

    During the combustion of 5.00g of octane C8H18, 239.5 kcal is released. Write a balanced equation for the combustion reaction. Are reactants or products favored? What is the sign of change of heat for this reaction? how much energy is released by the

    asked on June 7, 2015
  13. Chemistry

    Write a balance equation for the reaction of nitric acid (HNO3) with each base solution : [1]. NaHCO3, [2]. MgCO3. ( Please include the phases of the substance)

    asked on December 8, 2012
  14. physics

    The 100 kg block in figure takes 7.00s to reach the floor after being released from rest. What is the mass of the block on the left?

    asked on September 26, 2008
  15. AP calculus AB

    A spy tracks a rocket through a telescope to determine its velocity. The rocket is traveling vertically from a launching pad located 10 km away. At a certain moment, the spy's instruments show that the angle between the telescope and the ground is equal to

    asked on December 29, 2010
  16. Physics HELP!

    A 650 N boy and a 490 N girl sit on a 150 N porch swing that is 1.70 m long. If the swing is supported by a chain at each end, what is the tension in each chain when the boy sits .75 m from one end and the girl .5 m from the other end?

    asked on December 5, 2010
  17. Trig

    From a point A on the ground, the angle of elevation to the top of a tall building is 24.1 degrees. From a point B, which is 600 ft closer to the building, the angle of elevation is measured to be 30.2 degrees. Find the height of the building. PLEASE HELP

    asked on November 11, 2009
  18. Fractions

    lisa's dog has 4 squeaky toys. two thirds of the dog's toys are squeaky toys. how many dog toys does lisa's dog have in all?

    asked on January 24, 2014
  19. Chemistry

    Which of the following molecules has the highest boiling point? CH4,BH3,NH3, SH2?

    asked on October 7, 2012
  20. Chemistry H.

    Indium has two naturally occurring isotopes and an atomic mass of 114.818 amu. In- 113 has a mass of 112.904 amu and an abundance of 4.3%. What is the identity and percent abundance of indium's other isotope. I am very confused on how do I set up this

    asked on September 23, 2012
  21. Chemistry

    N2(g) + 3 H2(g) → 2 NH3(g) [balanced] If 5.42 g of nitrogen gas are reacted with 5.42 g of hydrogen gas, which of the reactants is the limiting reactant? Use the molar mass data below if necessary. Molar mass of N2 = 28.02 g/mol Molar mass of H2 = 2.02

    asked on February 20, 2017
  22. Math

    The path of a satellite orbiting the earth causes it to pass directly over two tracking stations A and B, which are 35 mi apart. When the satellite is on one side of the two stations, the angles of elevation at A and B are measured to be 87.0° and 84.2°,

    asked on June 22, 2016
  23. Cypress

    Suggest any limitations to the use of recrystallization as a purification method for a solid.

    asked on September 6, 2011
  24. Life orientation

    List two ways in which sport can support nation building

    asked on March 20, 2015
  25. Science

    You pull a door open. If the force the door exerts on you is equal to the force you exert on the door, why don't you move?

    asked on March 24, 2008

    A 0.445 kg ice puck, moving east with a speed of 2.82 m/s, has a head-on collision with a 0.918 kg puck initially at rest. Assuming a perfectly elastic collision, what will be the speed and direction of each object after the collision? speed of the ice

    asked on October 31, 2009
  27. Chemistry

    Determine the type of radiation: a frequency of 5.6 mhz

    asked on October 19, 2010
  28. 2nd grade/math

    How do you find the perimeter of a letter, example I, U, and J? The area for the I is 9 square cm. Do you still count all the sides or what? Any help would be appreciated!

    asked on March 8, 2011
  29. Math

    The maximum weight M that can be supported by a beam is jointly proportional to its width w and the square of its height h, and inversely proportional to its length L. a. Write an equation that expresses this prportionality b. Determine the constant of

    asked on March 20, 2010
  30. Science

    If you walk 20m, took a book from a library table, turned around, walked back to your seat. What are the distance and displacement travel by you? What are the distance and displacement traveled by the book?

    asked on February 21, 2008
  31. Math

    What effect will an outlier have on a confidence interval that is based on a small sample size? A) The interval will be smaller than an interval without the outlier. B) The interval will be the same with or without the outlier. C) The confidence interval

    asked on November 28, 2009
  32. Physics

    A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point.What is the angle of launch? What is the launch speed?

    asked on September 10, 2008
  33. chemistry

    name the elementwhich has the following numbers of particles: a.26 electrons,29 neutrons,26 protons b.53 protons,74neutrons c.2electrons(neutral atom) d.20 protons e.86electrons,125neutrons,82protons(charged atom) f.0 neutrons

    asked on October 7, 2008
  34. Chemistry

    In the explosion of a hydrogen filled balloon, 0.50 g of hydrogen reacted with 4.0 g of oxygen to form how many grams of water vapor? (water vapor is the only product)

    asked on September 4, 2011
  35. Impulse and Momentum

    A bullet of mass m is fired at speed v0 into a wooden block of mass M. The bullet instantaneously comes to rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic friction . What is the

    asked on March 1, 2015

    Mg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s). IS THE IRON(II) ION OXIDIZED?

    asked on February 22, 2017
  37. AP calculus AB

    At the instant when the radius of a cone is 3 inches, the volume of the cone is increasing at the rate of 9 pi cubic inches per minute. If the height is always 3 times the radius, find the rate of change of the radius at that instant.

    asked on December 29, 2010
  38. math

    A projectile is launched vertically upward from the top of a 240-foot building. This translates to the model y = -16t^2 + 32t + 240 where y is the height in feet and t is the time in seconds after it was launched, When will the projectile hit the ground?

    asked on September 25, 2008
  39. chemistry


    asked on June 7, 2015
  40. Physics

    A force F1 of magnitude 6.90 units acts on an object at the origin in a direction θ = 54.0° above the positive x-axis. (See the figure below.) A second force F2 of magnitude 5.00 units acts on the object in the direction of the positive y-axis. Find

    asked on September 20, 2015
  41. Physics

    A 4.5-kg brick is suspended by a light string from a 2.0-kg pulley. The brick is released from rest and falls to the floor below. The pulley may be considered a solid disk of radius 1.5 m. What is the linear acceleration of the brick and the tension in the

    asked on March 23, 2015
  42. Science

    A box being pushed with a force of 85N slides along the floor with a constant speed. What is the force of sliding friction on the box?

    asked on March 24, 2008
  43. math

    I am a multiple of 10. Factors include an even number and an odd number. Greater than 15 and less than 28. What number am I?

    asked on November 11, 2015
  44. Finance

    Joshua borrowed $2,300 for one year and paid $138 in interest. The bank charged him an $15 service charge. If Joshua paid the $2,300 in 12 equal monthly payments, what is the APR? (Round your answer to 1 decimal place

    asked on February 15, 2013
  45. Social Studies

    analyze the impact of plant and animal domestication in neolithic societies in middle america

    asked on October 10, 2016
  46. Physics

    A 31.5 N object is in free fall. What is the magnitude of the net force which acts on the object? Answer in units of N

    asked on December 4, 2014
  47. Math

    A state university wants to increase its retention rate of 4% for graduating students from the previous year. After implementing several new programs during the last two years, the university reevaluated its retention rate. Identify the Type I error in

    asked on December 5, 2009
  48. Algebra

    What are the foci of the hyperbola with equation 16y^2-9x^2=144

    asked on May 19, 2014
  49. Mathematics

    Tito Sanchez receives a weekly salary of $400. he also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he is to make a total of $790?

    asked on September 25, 2012
  50. physics

    A ball is thrown straight upward and returns to the thrower's hand after 2.20 s in the air. A second ball is thrown at an angle of 31.0° with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown

    asked on November 18, 2010
  51. physics

    Satellite A orbits a planet with a speed of 10,000 m/s. Satellite B is twice as massive as satellite A and orbits at twice the distance from the center of the planet. What is Satellite B's speed?

    asked on October 2, 2008
  52. Math

    Answers for A clock was exactly on time at noon on Monday. At 2 P.M. on Wednesday, it was 25 seconds slow. At that same rate, how much did it lose in 1/2 hour?

    asked on April 25, 2012
  53. math

    Suppose a and b are the roots of the quadratic equation x^2 +3x +5=0. What is the monic quadratic equation with roots a + 1/a and b +1/b?

    asked on June 9, 2019
  54. Survey of Math

    A math class contains 7 females (three of whom speak French and the rest speak only English),and 12 males (two of whom speak French and the rest speak only English). a) A student in the class is chosen at random. If you're told the student is female, what

    asked on February 1, 2018
  55. ethics

    There is a difference between power and authority. Which statement below best describes the relationship and/or difference between power and authority? All supervisors have power and authority. Supervisors gain authority from the people they supervise and

    asked on April 22, 2016
  56. physics

    a) If a photon and an electron each have the same energy of 20.0 eV, find the wavelength of each. b) If a photon and an electron each have the same wavelength of 250 nm, find the energy of each. c) You want to study an organic molecule that is about 250 nm

    asked on April 5, 2011

    *Consider a 0.15 m strontium chloride aqueous solution. a. Determine the molality (in m) of all solutes in the solution. Assume that strontium chloride completely ionizes when dissolved in water. All solutes means all cations and anions. The molality that

    asked on March 3, 2017
  58. Chemistry

    A sample of 10.7 g of O2 reacts completely with CO to form CO2. 2 CO + O2 → 2 CO2. How many grams of CO is required.

    asked on February 20, 2017
  59. Math

    We can find the solutions of sin x = 0.6 algebraically. (Round your answers to two decimal places.) (a) First we find the solutions in the interval [0, 2π). We get one such solution by taking sin−1 to get x = ________ (smaller value). The other solution

    asked on April 21, 2016
  60. Chem

    Could someone please walk me through step by step on how to do this. Propane (C3H8) burns in oxygen to produce carbon dioxide and water. C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g) Calculate the mass of CO2 that can be produced if the reaction of 48.2 g propane

    asked on October 7, 2010
  61. math

    How do you draw a array of 3x9

    asked on September 17, 2015
  62. Chemistry

    In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that are 2.80 inches in diameter and have a mass of 2.00g of silicon. How thick (mm) is each wafer if silicon has a density of 2.33g/cm^3? (The volume of a cylinder is

    asked on September 5, 2011
  63. chemistry

    THE QUESTION ASKS TO CALCULATE THE AMOUNT (IN GRAMS) OF CARBON DIOXIDE FROM THE AMOUNT OF SODIUM BICARBONATE THAT YOU USED IN THE REACTION Run 1. The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3 NaHCO3(aq) → Na3C6H5O7(aq)

    asked on February 28, 2017
  64. animal science

    Which of the following is true of the function of glucagon? A. Glucagon regulates insulin secretion. B. Glucagon increases glycogen breakdown into glucose. C. Glucagon inhibits glycogen breakdown into gluclose. D. Glucagon regulates somatostatin secretion.

    asked on August 15, 2012
  65. Physics

    In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." (See Fig. 5-35.) The room radius is 4.6 m, and the rotation frequency is 0.7 revolutions per second when the floor drops out. What is the minimum coefficient of static

    asked on October 4, 2009
  66. Math

    A batter hits a baseball straight up into the air. The height of the ball in metres above the ground is given by h(t)=-4.9t^2+23t+2, where t is the number of seconds after the ball is hit. a) What is the average rate of change in the height of the ball

    asked on February 14, 2014
  67. math

    Mark wants to use a grid to model 2/3 like the grids in questions 1 and 2. Its a 100 box grid . help

    asked on December 18, 2017
  68. Math

    Marginal revenue the weekly revenue from the sale of emeralds at Eduardo’s Emerald Emporium (EEE) is decreasing at a rate of $500 per $1 increase in price and the price is decreasing at a rate of $0.45 per additional emerald sold. What is the marginal

    asked on October 21, 2014
  69. math

    Allan borrowed $4800 from his father to buy a car. He repaid him after 9 months with interest of 5% per year. Find the total amount he repaid.

    asked on June 24, 2014
  70. general science

    A Compound Containing 3 Atoms Of Carbon And 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The Two End Products Of This Equation Are Carbon Dioxide And Water. What Element Should You Look At First In Balancing This Equation?

    asked on August 9, 2009
  71. physics

    Assuming the Earth's magnetic field averages about 0.50×10−4 T near Earth's surface, estimate the total energy stored in this field in the first 15km above Earth's surface. The radius of Earth is 6380 km.

    asked on March 23, 2014
  72. Physics

    A 10N meterstick is suspended by two sping scales, one at the .08 m mark and the other at the .9 m mark. If a weight of 5N is hung at the .2 m mark and a weight of 17N is hung at the .55 m mark, what will be the reading on each scale? I have:

    asked on December 8, 2010
  73. Chemistry

    How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? 4HCl + O2 --> 2H2O + 2Cl

    asked on October 3, 2010
  74. Pre-Cal

    A 13-ft ladder leans against a building so that the angle between the ground and the ladder is 63 degrees. How high does the ladder reach on the building? (round your answer to the nearest foot)

    asked on June 15, 2016
  75. chemistry

    methanol CH3OH is used as race car fuel write the balanced equation for the combustion of methanol. change in heat= -174kcal/mol methanol for the process How man kilocal are released u burning 33.0g of methanol

    asked on June 7, 2015
  76. algebra

    can you check my answers please? What are the first three terms of the sequence: a1 = 3 and an = 2(an1)2? 2, 8, 18 3, 18, 648 --3, 32, 50 2, 6, 12, 24 What is the 14th term in the sequence: an = 4n + 13? -43 43 __> -69 69 What is the recursive rule for the

    asked on March 22, 2012
  77. literature

    what lines show alliterations in the poem "Fable for when there's no way out"

    asked on March 30, 2015
  78. Calculus

    A large container has the shape of a frustum of a cone with top radius 5 m, bottom radius 3m, and height 12m. The container is being filled with water at the constant rate 4.9 m^3/min. At what rate is the level of water rising at the instant the water is 2

    asked on November 7, 2014
  79. Math

    A customer paid $247.13 in interest on a loan of $950.50. What is the percentage of interest paid?

    asked on May 31, 2012
  80. Chemistry

    I am so overwhelmed. can somebody please help me? Consider a solution that is 0.022 M in Fe^2+ and 0.014 in Mg^2+ A) if K2CO3 is to selectively precipitate one of the cations while leaving the other cation in solution, which cation will precipitate first?

    asked on April 1, 2013
  81. Biology

    The half life of carbon 14 is 5700 years. If the carbon 14 level measured in a fossilized bone has only 1/4 of the original amount, how old in the bone?

    asked on May 16, 2011
  82. literature

    why is the poem "Fable for when there's no way out" a good example of "seeing common things in an uncommon way?"

    asked on March 30, 2015
  83. physics

    The sun has a mass of 1.99 × 1030 kg and is moving in a circular orbit about the center of our galaxy, the Milky Way. The radius of the orbit is 2.3 × 104 light-years (1 light-year = 9.5 × 1015 m), and the angular speed of the sun is 1.1 × 10-15 rad/s.

    asked on March 9, 2015
  84. math

    When m is divided by 7, the remainder is 2. What is the remainder when 4m is divided by 7? Please give me an explanation and not just the answer! Thankss:)

    asked on July 20, 2011
  85. Dennis

    How many ways can the letters of the word HAPPINESS be arranged. If H must start the word, N must end the word and the P's must be separated? [question from the topic FACTORIAL,PERMUTATION AND COMBINATION ]

    asked on May 29, 2015
  86. math

    All 30 of the students in a mathematics class attended class on Monday. On Tuesday only 22 students attended. What was the percent decrease?

    asked on June 24, 2014
  87. physics

    A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2)

    asked on March 9, 2015
  88. Math

    Jasmine has taken an online boating safety course and is now completing her end of course exam. As she answers each question.,the progrss bar at the bottom She has just completed question 16 and the test bar how she is 20% of questions. How many total

    asked on October 29, 2013
  89. chemistry

    An experiment in your laboratory requires 500 mL of a .0200 M solution of Na2CO3. You are given solid Na2CO3, distilled water and a 500 mL volumetric flask Describe how to prepare the required solution showing all calculations and describing each step

    asked on November 15, 2011
  90. algebra homework help

    The sum of two consecutive integers is 285 is 18 and 54 correct

    asked on October 11, 2016
  91. I just posted chinese!!

    um, i don't think it appears really well on my monitor (is it just mine or...) if you can't see it, could you please give me your email add so that i can email it to you and you can check the mistakes? please help me...

    asked on January 26, 2009
  92. chemistry

    for N2O4(g)->

    asked on June 7, 2015
  93. Science

    Suppose you are standing on a bathroom scale next to a sink. How does the reading on the scale change if you push down on the sink?

    asked on March 24, 2008
  94. chem

    "Yule logs are simulated wood logs make of compressed paper that burn with a red and green flame.How would you produce a similar yule log?"

    asked on July 9, 2008
  95. math

    prove that for any positive integer n, the value of 3^2n+2 - 8n-9 is divisible by 64

    asked on July 21, 2019
  96. Statistics

    Roulette wheels in Nevada have 38 pockets. They are all numbered 0, 00, and 1 through 36. Of all 38 pockets, there are 18 red, 18 are black, and 2 are green. Each time the wheel is spun, a ball lands in one of the pockets, and each pocket is equally

    asked on April 7, 2016
  97. economics

    The hand made snuffbox industry is composed of 100 identical firms, each having short-run total costs given by STC=0.5q^2+10q+5 and short-run marginal costs by SMC=q+10 where q is the output of snuffboxes per day. a. What is the short-run supply curve for

    asked on November 3, 2007
  98. chemistry

    what is the freezing point of a solution that contains 20.2g of urea CO(NH2)2 in 295mL water? Assume a density of water of 1.00g/mL

    asked on June 14, 2015
  99. algebra

    how would I solve for this L = 2πrh; solve for r.

    asked on October 11, 2016
  100. Physics

    A ball player hits a home run, and the baseball just clears a wall 17.0 m high located 124.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the

    asked on November 6, 2011


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