Most popular questions and responses by Jim
  1. Math: Please help

    1. What is the simplified form of squared root 140? A.) 4 to the square root of 35 B.) 10 to the square root of 14 C.) 2 to the square root of 70 D.) 2 to the square root of 35 Please show me how to do this Thank You

    asked on March 12, 2013
  2. Chemistry

    the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^-7 L/mol*s. What is the rate constant at 645K? Please show all steps USING THE ARRHENIUS EQUATION. Here is my work so far: K = A

    asked on October 26, 2010
  3. Calculus

    The function f is continuous on the interval [3, 13] with selected values of x and f(x) given in the table below. Use the data in the table to approximate f '(3.5) x 3 4 7 10 13 f(x) 2 8 10 12 22

    asked on April 6, 2018
  4. Math

    13. A catapult launches a boulder with an upward velocity of 148 ft/s. The height of the boulder (h) in feet after t seconds is given by the function h = –16t² + 148t + 30. How long does it take the boulder to reach its maximum height? What is the

    asked on March 11, 2013
  5. Physics

    Tree point charges(A---B---C)have equal magnitudes and are located on the same line.? The separation d btw A and B is the same as btw B and C. A is +, B/C are -. Consider the net electrostatic force that each charge experience due to the other two charges.

    asked on August 24, 2011
  6. world history

    Which power did farmers, merchants, and artisans eventually gain in the roman republic? A. The ability to elect officials who could veto laws harmful to plebeians B. The ability to select patrician consuls C. The right to help Etruscan authorities in

    asked on October 26, 2017
  7. Physics

    Under the influence of its drive force, a snowmobile is moving at a constant velocity along a horizontal patch of snow. When the drive force is shut off, the snowmobile coasts to a halt. The snowmobile and its rider have a mass of 136 kg. Under the

    asked on October 24, 2012
  8. Walquist

    Geometry question. a Math riddle. What does a cat need to play baseball?

    asked on December 8, 2008
  9. math

    A manufacture has been selling 1300 television sets a week at 450 each. A market survey indicates that for each 14 rebate offered to a buyer, the number of sets sold will increase by 140 per week. a) Find the demand function , where is the number of the

    asked on October 9, 2011
  10. English

    Type of sentence: To keep your files in order, the filing rules must be learned. (A) Properly constructed (B) Lacks parallel parts (C) Dangler (D) Misplaced part. I believe it to be (A)?

    asked on September 28, 2016
  11. Math

    1) Find the surface area of a sphere with a radius of 8 cm. A 267.9 cm B 803.8 cm C 2143.6 cm D 2010. cm 2) Find the surface area of a sphere with a radius of 4 ft. A 452.2 m B 150.7 m C 113.0 m D 904.3 m 3) Find the volume of a sphere with a radius of 4

    asked on January 24, 2019
  12. AP Calculus

    A rectangle is inscribed between the parabolas y=4x^2 and y=30-x^2. what is the maximum area of such a rectangle? a)20root2 b)40 c)30root2 d)50 e)40root2

    asked on December 14, 2010
  13. math

    It takes a florist 3h 15min to make 3 small centerpieces and 3 large cebterpieces. It takes 6h 20min to make 4 small centerpieces abd 7 large centerpieces. How long does it take to make each small centerpiece and each large centerpiece? Write and solve a

    asked on May 24, 2013
  14. College Chemistry (Hard)

    The easiest fusion reaction to initiate is 1-1H + 1-1H------> 4-2He + 1-0 n The 1-1 indicates a small one above the other on the left side of the symbol of the element.So for 1-0n is a one above a zero on the left side of n (neutron). The number on the top

    asked on April 5, 2010
  15. Physics

    a pendulum-driven clock gains 5.00 s/day, what fractional change in pendulum length must be made for it to keep perfect time?

    asked on November 8, 2017
  16. ss

    How did Muslim Turks influence Turkey's development? Do not copy and paste anything, its not helpful.

    asked on December 12, 2016
  17. physics

    A stone with a mass of 1.0 kg is tied to the end of a light string which keeps it moving in a circle with a constant speed of 4.0 m/s on a perfectly smooth horizontal tabletop. The radius of the path is 0.60 m. How much work does the tension in the string

    asked on November 12, 2017
  18. AP Calculus

    2) Given the table below for selected values of f(x), use 6 trapezoids to estimate the value of (10)∫(1) f(x)dx x 1 3 4 6 7 9 10 f(x) 4 8 6 10 10 12 16

    asked on June 20, 2018
  19. Physics

    Pulling the string on a bow back with a force of 28.7lbs, an archer prepares to shoot an arrow. If the archer pulls in the center of the string, and the angle between the two halves is 138 degrees, what is the tension in the string?

    asked on March 8, 2010
  20. physics

    The value of g at Earth’s surface is about 9.8 m/s^2. If Earth were of uniform density (same mass/volume throughout), what would the value of g be inside Earth at half its radius?

    asked on March 6, 2012
  21. isosceles triangle

    An isosceles triangle is a triangle that has two equal sides. Find AB, BC and AC. Determine if the triangle is isoseles or not based on the lengths of the three sides. can someone show me how to solve?please The triangle is isosceles if AB = BC, or BC =

    asked on July 26, 2007
  22. English: Please help

    18. What is one disadvantage of accessing the Internet through a public search engine such as or ? A.) It’s open to anyone, so the information comes from many different people. B.) You won’t be able to access documents that have not been published

    asked on February 28, 2013
  23. Chemistry

    Calculate the enthalpy change (ΔH) for: HCl(aq) + NH3(aq) → NH4Cl(aq) The reaction of 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NH3 causes a temperature rise of 6.4 ˚C in the resulting 100.0 mL of solution. The NH4Cl solution has a density of 1.005

    asked on September 15, 2015
  24. chemistry

    Arrange the following compounds in order of increasing viscosity: Propanol, CH3CH2CH2OH; Propanediol, CH3CH(OH)CH2OH; Propanetriol , HOCH@CH(OH)CH2OH

    asked on June 23, 2010
  25. physics

    Imagine a Rip van Winkle type who lives in the mountains. Just before going to sleep, he yells, "WAKE UP", and the sound echoes off the nearest mountain and returns 7.6 hours later.Find the distance between Rip and the imaginary mountain.

    asked on April 29, 2012
  26. English

    Choose the option that corrects the error in the "quote". If no error exists, choose "No change is necessary." Bill, the foreman of the construction company, is concerned about the safety in the large building. "They have had" three accidents in the past

    asked on November 22, 2015
  27. physics

    The heat of vaporization of ethyl alcohol is about 200 cal/g.If 2.4 kg of this fluid were allowed to vaporize in a refrigerator, find what mass of ice would be formed from 0 degree C water.

    asked on April 3, 2012
  28. Chemistry

    I have worked this problem out a number of ways, but every answer I come up with is incorrect. I have posted my last answers underneath the question. Please advise. (a) What is the mass percentage of iodine (I2) in a solution containing 0.060 mol I2 in 105

    asked on September 13, 2007
  29. Physics

    A box weighing 215 N is placed on an inclined plane that makes a 55 degree angle with the horizontal. Compute the component of the gravitional force acting down the inclined plane.

    asked on November 29, 2010
  30. physics

    A small light source located 1 m in front of a 1 m^2 opening illuminates a wall behind. If the wall is 1 m behind the opening (2 m from the light source), the illuminated area covers 4 m^2. How many square meters will be illuminated if the wall is 3 m from

    asked on March 6, 2012
  31. physics

    Rank the microtidal forces on your own body, from greatest to least, produced by the:A. JupiterB. PlutoC. Earth greatest to least.

    asked on March 6, 2012
  32. physics

    On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. Find the

    asked on March 29, 2012
  33. Chemistry

    what are the intermolecular forces present in: 1. n-propyl alcohol 2. n-butanol 3. 2-butanol 4. tert-butanol alcohol 5. pentane 6. hexanes I know that the forces include- dipole-dipole, ion-dipole, dispersion, and hydrogen bonding...but I don't know how to

    asked on December 21, 2014
  34. Probability and Statistics

    According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. You randomly select peanut M&M’s from an extra-large bag looking for an orange

    asked on December 6, 2017
  35. English

    Combine these two simple sentences into a complex sentence. Many industrialized nations use the metric system. The United States refuses to adopt it. A. Although many industrialized nations use the metric system, the United States refuses to adopt it. B.

    asked on November 22, 2015
  36. ENGLISH 11

    Richard Bone by Edgar Lee Masters: When I first came to Spoon River I did not know whether what they told me Was true or false. They would bring me an epitaph And stand around the shop while I worked And say "He was so kind," "He was wonderful," "She was

    asked on March 5, 2012
  37. Chemistry

    At 573 K, gaseous NO2(g) decomposes, forming NO(g) and O2(g). If a vessel containing NO2(g) has an initial concentration of 1.9 × 10−2 mol/L, how long will it take for 75% of the NO2(g) to decompose? The decomposition of NO2(g) is second-order in the

    asked on September 23, 2015
  38. physics

    A ball has a diameter of 3.86 cm and average density of 0.0836 g/cm3. What force is required to hold it completely submerged under water?

    asked on November 21, 2011
  39. college

    Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked on October 28, 2009
  40. math

    a parking lot charges $1.50 for the first hour of parking and 55 cents for each additional half hour how much would it cost to park a car from 12:45pm to 6:15 pm

    asked on May 13, 2014
  41. Math: Please check

    A playground is shaped like a rectangle with a width 5 times its length (L). What is a simplified expression for the distance between opposite corners of the playground? A.) L square root 26 B.) 5L C.) 26L^2 D.) 6L Thanks

    asked on March 14, 2013
  42. Physics help please!

    Light waves with two different wavelengths, 632 nm and 474 nm, pass simultaneously through a single slit whose width is 7.63 x 10-5 m and strike a screen 1.30 m from the slit. Two diffraction patterns are formed on the screen. What is the distance (in cm)

    asked on March 30, 2012
  43. College Chemistry

    a solution contains .25M Ni(NO3)2 and .25 M Cu(NO3)2. Can the metal ions be separated by slowly adding Na2CO3?Assume that for successful separation 99% of the metal ion must be precipitated before the other metal ion begins to precipitate, and assume no

    asked on March 12, 2010
  44. Math: Please check

    What is the simplified form of square root 48n^9? I think the answer is: 3n square root 4n^8. Thank You

    asked on March 12, 2013
  45. Chemistry

    One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the following reaction: CCl2F2 --> CF2Cl + Cl Chlorine atoms can act as a catalyst for the destruction of ozone. The

    asked on October 26, 2010
  46. chemistry

    Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

    asked on October 28, 2009
  47. english

    Describe the narrow escape of the men aboard the Nautilus.

    asked on December 11, 2018
  48. physics

    Rank the beat frequency from highest to lowest for the following pairs of sounds:a. 876 Hz, 871 Hz b. 786 Hz, 784 Hz c. 721 Hz, 728 Hz d. 542 Hz, 541 Hz

    asked on April 29, 2012
  49. physics

    This question is typical on some driver's license exams: A car moving at 50km/hr skids 15m with locked brakes.How far will the car skid with locked brakes at 120 km/h?

    asked on February 27, 2012
  50. chemistry

    If you are given a 0.32 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?

    asked on November 17, 2009
  51. Math

    4. Landon is standing in a hole that is 6.5 ft deep. He throws a rock, and it goes up into the air, out of the hole, and then lands on the ground above. The path of the rock can be modeled by the equation y = 0.005x² + 0.45x – 6.5, where x is the

    asked on March 11, 2013
  52. Math

    A store owner bought comforters for x dollars and is marking them up 60 percent write two expressions that represent the selling price and show that they are equivalent.

    asked on January 12, 2016
  53. physics

    As shown below, a bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length and negligible mass. What is the minimum value of v such that

    asked on March 22, 2009
  54. Math

    A rectangular swimming pool is 7 meters longer then it is wide. It is surrounded by a concrete walkway 1.5 meters wide. The area of the walkway is 120 meters squared. What are the dimensions of the pool?

    asked on November 16, 2010
  55. physics

    in a daring rescue by helicopter, two men with a combined mass of 172 kg are lifted to safety. a)If the helicopter lifts the menstraight up with constant acceleration, is the tension in the rescue cablegreater than, less than, or equalto the combined

    asked on March 8, 2010
  56. Chemistry

    Could someone check my answers? 1. Why was 95% ethanol alcohol added when titrating aspirin in an experiment? Because it helps the aspirin dry quicker and become pure while the titration is going on. 2. Would the following mistakes cause the calculated

    asked on March 27, 2007
  57. Physics- PLEASE!!

    A U-shaped tube is filled mostly with water, but some vegetable oil has been added to both sides of the U tube. On the right side of the tube, the depth of oil is 5.00 cm . On the left side of the tube, the depth of the oil is 2.30 cm. The density of the

    asked on December 4, 2009
  58. physics

    A photographer in a helicopter ascending vertically at a constant rate of 1.2m/s accidentally drops a camera out of the window when the helicopter is 46m above the ground. How long will it take the camera to reach the ground

    asked on September 6, 2015
  59. math

    help fast Find the area of a parallelogram with base b and height h. b = 87 cm h = 18.6 cm

    asked on March 14, 2018
  60. chemistry

    The normal boiling point of acetone is 56.2 (degrees)C and the molar heat of vaporization is 32.0 kj/mol. At what temperature will acetone boil under a pressure of 50.0 mmHg?

    asked on June 21, 2010
  61. Composite Materials

    Can someone please help with this problem? A burnout test was performed to determine the volume fractions of constituents in a glass/epoxy composite. The following observations were made: Weight of empty crucible = 47.6504 g Weight of the crucible and

    asked on February 26, 2009

    A ball of mass 0.150kg is dropped from a height of 1.25m. It rebounds from the floor to reach a height of 0.960m. What impulse was given to the ball by the floor?

    asked on March 29, 2008
  63. Chemistry

    Complete and balance the following equation S(s)+HNO3(aq)--->H2SO3(aq)+N2O(g) An explanation would be excellent, thanks in advance.

    asked on April 14, 2012
  64. physics

    A 370kg piano slides 2.9m down a 24∘ incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Ignore friction.

    asked on June 9, 2014
  65. health

    The main purpose of a peer review committee is to A. collect and prepare information to be submitted to the NPDB. B. establish procedures for confidentiality of incident reports. C. identify activities that suggest guidelines aren't being followed. D.

    asked on May 31, 2011
  66. income tax

    Kobe is a single dad with two dependent children, Lizzie, age 7 and Leslie, age 3. He has AGI of $51,000 and paid $6,300 to a qualified day care center. What amount of credit can Kobe receive for the child and dependent care credit?

    asked on June 29, 2014
  67. Physics

    A point charge +6.7 uC is placed at the origin, and a second charge –3.6 uC is placed in the X - Y plane at (0.40 m , 0.55 m ). Where should a third charge be placed in the plane so that the net force acting on it is zero?

    asked on January 11, 2013
  68. Physics- drwls please help

    (a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year

    asked on March 28, 2007
  69. physics

    If you drop a piece of ice on a hard surface, the energy of impact will melt some of the ice. The higher it drops, the more ice will melt upon impact.Find the height from which a block of ice should ideally be dropped to completely melt it that falls

    asked on April 3, 2012
  70. Chemistry

    What would be the effect of each of the following on the calculated molecular weight of the solute? a) some cyclohexane evaporated while the freezing point of pure cyclohexane was being measured. ( i think it would be higher) b)Some cyclohexane evaporated

    asked on January 29, 2013
  71. English

    Identify the INCORRECT sentence. A. Amanda worked diligently on her algebra homework. B. Trudy bought a American-made car. C. My sister angrily slammed the door. D. You should concentrate closely on whatever you write. D

    asked on October 15, 2015


    asked on January 2, 2009
  73. Probability and Statistics

    If a seed is planted, it has a 95% chance of growing into a healthy plant. If 6 seeds are planted, what is the probability that exactly 4 don't grow?

    asked on December 6, 2017
  74. Chem

    A mixture of chromium and zinc weighing .362 g was reacted with an excess of hydrochloric acid. After all the metals in the mixture reacted 225 mL of dry hydrogen gas was collected at 27 C and 750 torr. Determine the mass percent Zn in the metal sample.

    asked on February 25, 2007
  75. physics

    What beat frequencies are possible with tuning forks of frequencies 258, 263, and 267 Hz?

    asked on April 29, 2012
  76. Chemistry URGENT!

    If the reaction of 0.500 grams of aluminum metal with excess aqueous HCl releases 9.72 kJ of heat, what is the ΔH value for the reaction? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) All I have is: .500gAl*(1 mol Al/26.98gAl) Please and thank you so

    asked on September 10, 2015
  77. Physics

    Two straight and parallel wires of length 1.0 m carry a current - the first carries a currecnt of 9.0 A while the other wire carries a current of 4.0 A. What distance must separate the two straight and parallel copper wires if the force between them is to

    asked on December 8, 2010
  78. Physics

    A store owner wishes to hang a sign weighing 750 N so that Cable A attached to the store makes a 30 degree angle from the vertical wall. Cable B is attached horizontally to an adjoining building. Calculate the necessaryt tension on Cable B.

    asked on November 29, 2010
  79. Grad Economic

    If the real money demand is greater than the real money supply, interest rates must rise to reach equilibrium in the money market as institutions sell bonds to obtain more money.

    asked on June 11, 2015
  80. physics

    A package is dropped from a helicopter that is descending steadily at a speed v0. After t seconds have elapsed, consider the following. (a) What is the speed of the package in terms of v0, g, and t? (Use any variable or symbol stated above as necessary.

    asked on September 17, 2011
  81. Probability and Statistics

    A high school baseball player has a 0.193 batting average. In one game, he gets 7 at bats. What is the probability he will get at least 2 hits in the game?

    asked on December 6, 2017
  82. math

    lucy has a collection of buttons 2/3 of her buttons are square and 2/8 of her buttons are round. does lucy have more square buttons or round buttons?

    asked on February 20, 2014
  83. Probability & Statistics

    32% of women consider themselves fans of professional baseball. You randomly select six women and ask each if she considers herself a fan of professional baseball.

    asked on February 17, 2013
  84. Physics

    A 50.0-kg person takes a nap in a backyard hammock. Both ropes supporting the hammock are at an angle of 15.0degrees above the horizontal. Find the tention of the ropes.

    asked on March 8, 2010
  85. Math

    Convert the equation to polar form. 8x=8y So far, I got this: 8*rcosθ = 8*rsinθ But it's wrong.

    asked on March 25, 2019
  86. Statistics 1

    Professor White asked his students to put the number of hours each studied for the final exam on a piece of paper and turn that paper in with the exam. The pieces of paper indicate that students studied 10, 3, 4, 25, 1, 4, 4, 12, 6, 8, and 10 hours. What

    asked on December 1, 2013
  87. Physics

    A 3.0 kg rock is initially at rest at the top of a cliff. Assuming the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water, how high is the cliff if the temperature of 1.0 kg of water is raised

    asked on April 2, 2008
  88. Physics check

    A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 "g's" (recall that g = 9.8 m/s2). Calculate the force, in N, on a 68 kg person accelerating at this rate. 30"g" x 9.8 294 ms^2 f=ma 294x68 =19,992N

    asked on October 8, 2009
  89. statistics

    In a distribution of sentence lengths in months like the following: 6, 12, 10, 18, 24, 360; which statistic would a researcher not want to report? a. standard deviation b. mean c. range d. raw numbers

    asked on November 29, 2013
  90. chemistry

    A 9.96 mol sample of methane gas is maintained in a 0.836 L container at 296 K. What is the pressure in atm calculated using the van der Waals' equation for CH4 gas under these conditions? For CH4, a = 2.25 L2atm/mol2 and b = 4.28E-2 L/mol.

    asked on January 29, 2012
  91. Statistics

    In a survey, 55% of the voters support a particular referendum. If 30 voters are chosen at random, find the standard deviation of the number of voters who support the referendum.

    asked on October 14, 2013
  92. chemistry

    Calulate the wavelengths (in nm) of the visible lines in the line spectrum of hydrogen using the Rydberg equation (nf = 2; ni = 3, 4, 5, and 6).

    asked on November 10, 2009
  93. physics

    An object is attached to the lower end of a 100-coil spring that is hanging from the ceiling. The spring stretches by 0.210 m. The spring is then cut into two identical springs of 50 coils each. As the drawing shows, each spring is attached between the

    asked on November 17, 2012
  94. chemistry

    A solution is prepared by dissolving 23.7g of CaCl2 in 375.0g of water. The density of this solution is 1.05g/mL. determine the concentration (molarity) of Cl in solution.

    asked on March 14, 2011
  95. chemistry

    which probably has the lowest boiling point at 1.0 atm pressure. A) C6H14 B) C3H8 C) C4H10 D) C5H12 E) C2H6

    asked on June 21, 2010
  96. Math

    There are 14 children in little league baseball team. Only 9 can play at a time. The baseball season has 42 games. The coach decided that each of the 14 children would play in the same number of complete games.In how many complete games will Howard, one of

    asked on January 4, 2016
  97. payroll

    An employee's rate of pay is $40.00 per hour, with time and a half for all hours worked in excess of 40 during a week. The following data are available: Allowances claimed on W-4 4 Allowance amount allowed:$70 ea. Hours worked this week 50 Y T D Earnings

    asked on July 1, 2012
  98. Physics

    Two identical point charges are fixed to diagonally opposite corners of a square that is 0.6 m on a side. Each charge is +2.5 µC. How much work is done by the electric force as one of the charges moves to an empty corner?

    asked on August 31, 2011
  99. MATH

    A box with an open top has vertical sides, a square bottom, and a volume of 4 cubic meters. If the box has the least possible surface area, find its dimensions. Length of base= Height=

    asked on November 14, 2012
  100. pre calc

    a kite currently flying at an altitude of 16 meters above the ground. If the angle of elevation from the ground to the kite is 30 degrees, find the length of the kite string to the nearest meter.

    asked on January 2, 2012


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