Popular questions and responses by Holly
  1. Physics

    A mechanic uses a chain and block to lift a 875-kg engine 4.00 m to the top of the garage. The downward force in the chain over the 4.00 m distance is 5.00 x 10^4 N. A) Calculate the work done in raising the motor B) How much useful work was done? C) What

    asked on January 16, 2014
  2. chemistry

    A sample of O2 gas is collected over water at 23C at a barometric pressure of 751 mmHg (vapor pressure of water at 23C is 21 mmHg). The partial pressure of O2 gas in the sample collected is: (a) 21 mmHg (b) 751 mm Hg (c) 0.96 atm; or (d) 1.02 atm The

    asked on November 2, 2011
  3. geometry

    What is the value of x to the nearest tenth? The figure is not drawn to scale. (1 point) x = 2.1 x = 3.4 x = 9.6*** x = 13.1

    asked on April 11, 2020
  4. Chem 101

    In a fission reaction, uranium-235 bombarded with a neutron produces strontium-94, another small nucleus, and 3 neutrons. Write the nuclear equation for this reaction.

    asked on December 6, 2013
  5. Pre-calculus help

    I have two problems I am stuck on, if you could show me how to solve the problems it would be much appreciated. 1) Find sin 2x, cos 2x, and tan 2x from the given information. tan x = − 1/6, cos x > 0 sin 2x = cos 2x = tan 2x = 2) Find sin 2x, cos 2x, and

    asked on April 10, 2015
  6. Chemistry

    What is the oxidation number for each atom in NH4F? N=+3, H=-4, F=+1 N=-3, H=+1, F=-1*** N=+3, H+1, F=-1 N=-3, H=-1, F=+1

    asked on May 19, 2016
  7. Chemistry

    A solution contains 25 mmol of H3PO4 and 10. mmol of NaH2PO4. What volume of 2.0 M NaOH must be added to reach the second equivalence point of the titration of the H3PO4 with NaOH?

    asked on March 23, 2013
  8. statistics

    A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8. Which of the following is the 99% confidence interval for the average number of minutes

    asked on March 29, 2012
  9. geometry

    Are the polygons similar? If they are, write a similarity statement and give the scale factor. The figures are not drawn to scale ABCD ~ KLMN; 7.2:1.8 ABCD ~ KLMN; 3:1.8 ABCD ~ NKLM; 3:5.4 The polygons are not similar***

    asked on April 11, 2020
  10. Chemistry

    Barium carbonate and nitric acid reacts in a double displacement reaction. One of products also dissociates and evolves carbon dioxide. Write the net ionic reaction including the proper use of phase labels for this solution run in aqueous solution. After

    asked on June 24, 2013
  11. calculus

    Find the points on the curve below at which the tangent is horizontal. Use n as an arbitrary integer. (Enter your answers as a comma-separated list.) y = sin x/ 2 + cos x

    asked on February 6, 2012
  12. chem

    Calculate ΔG° (in kJ/mol) for the following reaction at 1 atm and 25 °C: C2H6 (g) + O2 (g) → CO2 (g) + H2O (l) (unbalanced) ΔGf° C2H6 (g) = –32.89 kJ/mol; ΔGf° CO2 (g) = –394.4 kJ/mol; ΔGf° H2O (l) = –237.13 kJ/mol

    asked on April 10, 2016
  13. statistics

    Please let me know if I solved this right The lifetime of television produced by the Hishobi Company are normally distributed with a mean of 75 months and a standard deviation of 8 months. If the manufacturer wants to have to replace only 1% of its

    asked on February 11, 2011
  14. chemistry

    If 10g of steam at 110 c is pumped into an insulated vessel containing 100g of water at 20 c, what will be the equilibrium temperature of the mixture? spheat H2O(l)=4.18J/g*c, spheat h2O(g)=2.03J/g*c, heat of vap H2O(l)=2.260kJ/g

    asked on August 1, 2010
  15. Math

    1. Which property is NOT a characteristic of a parallelogram? A. Opposite sides are not congruent B. All angles are congruent** C. Opposite sides are parallel D. Opposite angles are congruent

    asked on February 11, 2016
  16. Chemistry

    List the amino acid side chains that can accept H+ and those that can donate H+ during enzyme catalyzed reactions. I have lysine, arginine, and histidine as acceptors and serine, threonine, and tyrosine as donators. Could someone just tell me if those are

    asked on April 20, 2010
  17. Chemistry

    Write IUPAC name of the following alkanes: 1. (CH3)3-C-CH2-CH2-CH3 Would the name be 2,2,4-trimethylhexane? 2. CH3CHCH2CHCH2CH2CH3 with a CH3 attached to the 2nd carbon and the 4th carbon. Would the name be 2,4-diheptane? 3. CH3-C-C-CH3 with a CH3 attached

    asked on January 26, 2010
  18. Public Speaking

    Evaluating audience feedback to your speech presentation usually happens: A. before the speech. B. after the speech. C. during the speech. D. in the speech preparation

    asked on April 14, 2014
  19. Chemistry

    How much heat would be required to convert 234.3 g of solid benzene, C6H6(s), at 5.5 c into benzene vapor, C6H6, at 100 c? mp of C6H6=5.5c bp of C6H6=80.1 c mhc C6H6(l)=136J/mol*c mhc C6H6(g)=81.6J/mol*c mhfusion at 5.5 c=9.92kJ/mol mhvaporization at 80.1

    asked on August 1, 2010
  20. Chemistry

    What is the molarity of an HNO3 solution if 24.1mL of a 0.250M Ba(OH)2 solution is needed to titrate a 15.0mL sample of the acid? Can you tell me the process to finding this answer?

    asked on March 18, 2015
  21. chemistry

    Which represents the largest pressure? A)five mmHg B)one atmosphere C)one millimeter of mercury D)one hundred pascals E)five pounds per square inch I tried converting them all to mmHg and I think the answer is B, but I just want to make sure.

    asked on November 8, 2009
  22. geometry

    6. Are the two triangles similar? How do you know? (1 point) no yes; by AA ~** yes; by SAS ~ yes; by SSS ~

    asked on April 11, 2020
  23. Math

    Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the high temperature for the day is 87 degrees and the low temperature of 63 degrees occurs at 5 AM. Assuming t is the number of hours since midnight, find an

    asked on September 2, 2014
  24. trig

    Find all solutions of cos (x) + 1/2 sec (x) = -3/2 in the interval (2pi, 4pi) (Leave your answers in exact form and enter them as a comma-separated list.)

    asked on July 31, 2013
  25. chemistry

    A quantity of electrical charge that brings about the deposition of 4.5 g Al from Al3+ at a cathode will also produce what volume (STP) of H2(g) from H+ at a cathode? I know there are 3 e- difference b/w the two reactions. I took 4.5 g/3 and get 1.5 g H2.

    asked on October 9, 2011
  26. chemistry

    Calculate the pH at the point in the titration of 25.00 mL 0.108 M HNO2 at which 10.00 mL 0.162 M NaOH have been added. For HNO2, Ka=5.1 x 10^-4 and: HNO2 + OH- -----> H2O + NO2- I know that HNO2 is a weak acid and NaOH is a strong base. Help given to me

    asked on October 4, 2011
  27. accounting

    P20-2A For the year ended December 31, 2010, the job cost sheets of DeVoe Company contained the following data. Job Number Explanation Direct Materials Direct Labor Manufacturing Overhead Total Costs 7640 Balance 1/1 $25,000 $24,000 $28,800 $77,800 Current

    asked on March 27, 2011
  28. Math

    What is the multiplicative inverse of 6 1/7? My answer- 16

    asked on April 7, 2014
  29. Chemistry

    Ok so reviewing my notes I also got 11,326.6 as the volume in ml. The density of water he wanted us to use was (0.9975) and I went from 1 gal of H2O = 3.785 liters = 3785 grams then multiplied by 3 giving me 11,355g H2O. The only other step I could come up

    asked on September 25, 2012
  30. Math

    You want to find the total amount of water in a storage tank that measures 2 ft by 4 ft by 3 feet. Which of the following expressions could be used to find the measure of the tank capacity in cubic feet? a. 2x4x3 b. 2+2+4+4+3+3 c.(2x4x3)x2 d.(2+4)x3

    asked on August 20, 2012
  31. Math

    The portion of a swimming pool that is below the full water line measures 12 feet by 30 feet by 6 feet deep. What is the volume of water in the swimming pool when it is full, expressed in cubic yards? (1 cu yd =27 cu ft) a.60 cu yd b. 72 cu yd c.74.6 cu yd

    asked on August 20, 2012
  32. Math

    What is the rule for the pattern < < < # < < < # n + _______?

    asked on September 27, 2010
  33. Chemistry

    An amino acid has the form shown at R-CH-C-O^- (with a NH2 bonded to the CH and a O double bonded to the C) (O^- means the C has a negative charge) a) a pH of 7.0 b) any pH other than 7.0 c) a pH greater than its isoelectric point d) its isoelectric point

    asked on March 25, 2010
  34. Chemistry

    What is the repeating unit of nylon 6-6?

    asked on February 24, 2010
  35. Chemistry

    Write IUPAC name of the following alkanes: 1. (CH3)3-C-CH2-CH2-CH3 Would the name be 2,2-dimethylpentane? Wouldn't it look like this: CH3-C-CH2-CH2-CH3 with a CH3 on the top and bottom of the C, which would be the 2nd carbon... right? I don't understand

    asked on January 26, 2010
  36. some science

    a filter tip or a cigarette acts as both a filter and a condenser. which of the following cannot be removed, assuming the filter tip is 100% efficient? a. carbon monoxide, boiling point -191 degrees. b. nicotine, boiling point 247 degrees. c. tar, boiling

    asked on December 22, 2006
  37. career

    Now that you have explored different types of careers, you should have some idea of what kind of career you would like to pursue. In one or two paragraphs, answer the following questions: What kind of job within your chosen career field do you wish to

    asked on April 19, 2020
  38. English

    Which sentence contains the present participle of the verb (go)? A. Tyler is going to the soccer game. B. Tyler has gone to the soccer game. C. Tyler goes to the soccer game. D. Tyler will go to the soccer game.

    asked on December 9, 2019
  39. programing

    create an algorithm, flowchart, and pseudocode for a solution of the following problem. This solution will include the use of arrays needed to complete all parts of the logic. You have requested to develop a program that will record and process the

    asked on April 26, 2017
  40. computer science

    create an algorithm, owchart, and pseudocode for a solution of the following problem. This solution will include the use of arrays needed to complete all parts of the logic. You have requested to develop a program that will record and process the rainfall

    asked on April 26, 2017
  41. physics

    a bird flies 3km west and then 4km south. find the resultant displacement of the bird

    asked on February 9, 2017
  42. chemistry

    1. based on the equation below, how many liters of water can be produced from 8.5 L (assume that hydrogen is in excess) 2H2(g)+O2(g) --->2H2O(g)

    asked on February 7, 2017
  43. Chemistry

    Identify the compound and classify its functional group in the image H H H H H H H-C-C-C-O-C-C-C-H H H H H H H

    asked on June 1, 2016
  44. Chemistry

    What is the reducing agent in the following reaction? 2K + S - - > K2S K S*** K2S None of the above

    asked on May 19, 2016
  45. Chemistry

    Iron metal is formed during the reduction of iron(III) oxide: Fe2O3 + 3CO 2Fe + 3CO2 When 29.7 kg of Fe2O3 react with 17.8 kg of CO and 4.5 kg of Fe are recovered, what is the percent yield for the reaction?

    asked on April 25, 2016
  46. Algebra

    Using two variables - A carpenter wants to cut a 24-foot board into two pieces so that one piece is 5 times as long as the other. How long should each piece be?

    asked on April 20, 2015
  47. physics

    A ball is thrown vertically upward from the edge of a cliff of height 131 m. The initial velocity is 77.7 m/s. how high is the cliff?

    asked on April 14, 2015
  48. Math

    Directions: Use the following matrix to perform the elementary row operations sequentially. A=[3 2 |8] [5 2 |12] 1.) (1/3) R1 From the original matrix 2.) -5R1+R R2 From matrix in question 1.

    asked on March 23, 2015
  49. Science

    A sled and rider with a combined weight of 59 kg are at rest on the top of a hill 24 m high. (a) What is their total energy at the top of the hill? (b) Assuming there is no friction, what would the total energy be on sliding halfway down the hill?

    asked on February 25, 2015
  50. Algebra

    Assume the car can be purchased for 0% down for 60 months (in lieu of rebate). A car with a sticker price of $42,900 with factory and dealer rebates of $5,100 (a) Find the monthly payment if financed for 60 months at 0% APR. (Round your answer to the

    asked on August 10, 2014
  51. Math Pre-Cal

    When I am giving the point vertex of (1,-1) and another point of (2,2) and i need to put the answere in the form f(x)=ax^2+bx+c how would I go about doing that?

    asked on January 30, 2014
  52. Physics

    Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O

    asked on January 16, 2014
  53. Physics

    A farmer drives a 0.100 kg iron spike with a 2.00 kg sledge hammer. The sledge hammer moves at a constant speed of 3.99 m/s until it comes to rest on the spike after each swing. Assuming all the energy is absorbed by the nail, and ignoring the work done by

    asked on January 16, 2014
  54. Physics

    A 599 g piece of silver at 150 degrees C is submerged in 1000 g of water at 5 degrees C to be cooled. Determine the final temperature of he silver and water given Heat capacity of water= 4.18 x 10^3 j/kg degrees C Heat capacity of silver= 2.49 x 10^2 j/kg

    asked on January 16, 2014
  55. Trigonometry

    Find all solutions of 4(sin(x)**2)-8cos (x) -8 = 0 in the interval (2pi, 4pi). (Leave your answers in exact form and enter them as a comma-separated list.)

    asked on July 31, 2013
  56. chemistry

    Describe what happens in a fission reaction. What is a commonly used isotope in a nuclear fission reactor? Describe how a fission nuclear reactor power plant works.

    asked on May 30, 2013
  57. Homeland Security

    the development of Al Qaeda, at what point in the organization’s growth do you feel it should have become a concern to United States government officials? Explain

    asked on February 1, 2013
  58. med. terminology

    i am having some trouble, i have found some of the mistake but seem like i cant finf the rest: CHIEF COMPLAINT: This 53-year-old man visited the outpatient clinic for dyspnea and recurrent coughing. HISTORY OF PRESENT ILLNESS: This patient has a long

    asked on January 12, 2013
  59. Physics HELP!

    A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure. Model it as a stiff rod of negligible mass 3.00 m long and joining

    asked on November 6, 2012
  60. Math

    is solve f(x) = 0 for x the same thing as solve f(x) = 0? Would you do the same thing or does the difference in the wording make it a different question?

    asked on August 15, 2012
  61. maths

    a regular dodecagon has a side lenght of 5.6cm find the side lenght of a regular octagon that has the same perimeter?

    asked on December 6, 2011
  62. chemistry

    P(s)+ H+ + NO3- ---> H2PO4 + NO + H2O I am trying to write the two half rxns and I can get one, but not the other. I have: red: NO3- +4H+ +3e- ---> NO + 2H2O Ox: P(s) + ? ----> H2PO4- + x e- thank you!

    asked on October 6, 2011
  63. chemistry

    If given the quantum numbers: 2,1,-1,-1/2 give the element. I understand the first two numbers and getting to the p orbitals of the second period, but I am not sure on how to designate -1 and -1/2 to Carbon (the answer) Also for: 4,1,0,-1/2 is Selenium. I

    asked on September 19, 2011
  64. maths

    ben bought a car for £12,000 each year the value of the car depreciated by 10% what is the value of the car 2 years after he bought it?

    asked on June 5, 2011
  65. maths

    abby and berry share £22 in the ration 3:1 how much do each person get?

    asked on June 5, 2011
  66. chemistry

    How do you find the molarity(M) of NaOH in this reaction: 2NaOH(aq) + H2C2O4-H2O > Na2C2O4(aq) + 2H2O The only given information is 0.2079g of H2C2O4-2H2O

    asked on May 11, 2011
  67. Science

    The chemical eqaution H squared + Cl squared > 2 HCl represents which type of reaction? Thanks, if you can get it):

    asked on April 26, 2011
  68. Algebra

    Use P= -7200+300x-2x^2 p= profit x- selling price question: Determine the selling price when 90% of the maximum possible profit is earned

    asked on January 6, 2011
  69. thermo

    equal masses of ice at 0 oC, water aat 50 oC and steam at 100 oC are mixed and allowed to reach equilibrium. what will be the final temp of the mixture? and what percentage is the water and what percent will be steam??

    asked on November 5, 2010
  70. thermo

    equal masses of ice at 0 oC, water aat 50 oC and steam at 100 oC are mixed and allowed to reach equilibrium. what will be the final temp of the mixture? and what percentage is the water and what percent will be steam??

    asked on November 5, 2010
  71. algebra

    Can someone PLEASE explain how to do this to me? Thank you so much! Ten gallons of a 30% acid mixture is obtained by mixing a 50% solution (X) with 20% solution (Y). Write an equation for the 10 gallon mixture. What is the acid concentration, in gallons,

    asked on October 28, 2010
  72. Biology

    We cut a slice of the target gene from the gel which ran electrophoresis. And then purified the gene from the gel by using Gel-M column, WN buffer and WS buffer. After these steps, we ran another electrophoresis of the purified gene and there was no band

    asked on April 11, 2010
  73. Chemistry

    The reaction of 1,6-hexanediamine with hexanedioic acid chloride to form nylon 6-6 is a condensation polymerization. What is the small molecule that is split off in each step of the reaction?

    asked on February 24, 2010
  74. Chemistry

    CORRECTION: (sorry!) What major product will be obtained if the following alcohol is dehydrated: CH3 | CH3CH2CCH3 | OH (the CH3 is connected to the 3rd Carbon from the left and the OH is attached to the same Carbon) I tried to do it and this is what I got:

    asked on February 22, 2010
  75. Art

    I need a 3d picture of a mansion or a villa for my two point perspective can you tell me a good website PLease

    asked on September 23, 2008
  76. sicence

    with your knowlage draw a diagram of the chemical changes of when a candle is alight

    asked on April 21, 2008
  77. Japanese

    How do you write appositives in Japanese? The sentence I have is "The frog who lived in Osaka wished to go to Kyoto, where the great Midako had his palace.

    asked on June 4, 2007
  78. Linear Measurements

    Is one mile about 1609 meters? Is one meter about 39 inches? About how long is one kilometer in miles? And i have other questions but i shall try to figure them out!HELP PLZ!!! yes, yes, .6 miles

    asked on March 11, 2007
  79. Neon

    I need to find out the cost of the inert gas, Neon and it's Normal Phase to finish off a project. I have searched and searched but can't come up with the info needed. Neon is a rare gas, obtained by liquifing air. Its cost for very pure form is about

    asked on October 16, 2006
  80. math

    A 13​-foot ladder is placed against a vertical wall of a​ building, with the bottom of the ladder standing on level ground 12 feet from the base of the building. How high up the wall does the ladder​ reach?

    asked on April 17, 2020
  81. math

    4/3 cup of sugar to make 24 cookies how much cups for 48 cookies

    asked on April 15, 2020
  82. geometry

    What similarity statement can you write relating the three triangles in the diagram? ΔJMK ~ ΔMLK ~ ΔJLM ΔJMK ~ ΔLMK ~ ΔJLM ΔJLM ~ ΔMLK ~ ΔJKM*** ΔJKM ~ ΔMKL ~ ΔMJL

    asked on April 11, 2020
  83. geometry

    1. The Seattle Space Needle is 604 feet tall. A model of the building is 48 inches tall. What is the ratio of the height of the model to the height of the actual Space Needle? (1 point) 151:1 151:12 1:151*** 12:151

    asked on April 11, 2020
  84. geometry

    Given Line RQ, TQ, WQ, and YQ are radii. Prove: triangle QWT is congruent to triangle QYR

    asked on December 18, 2019
  85. math

    I am a three-digit number the sum of my digits is eighteen Five letters are used to spell my second number The difference between my first two digits is one. I have fewer even digits than odd digits My second digit is greater than my first digit I am a

    asked on October 27, 2019
  86. programming

    how do you design a program that asks the user to enter a store's sales for each day of the week. the amount should be stored in an array. use a loop to calculate the total sales for the week and display the result.

    asked on April 30, 2019
  87. math

    what is 9+10-5°/°2=

    asked on February 23, 2019
  88. astronomy

    Earth is spinning at 1670 km/h at the equator. Use this number to find Earth’s equatorial diameter.

    asked on January 22, 2019
  89. social studies

    1.Which is an effect of deforestation? A. soil erosion B. air pollution C. water pollution------- D. earthquakes 2. Which of the following is a reason so many people have migrated from Middle America to other regions? A. They dislike the region's climate.

    asked on November 7, 2018
  90. Maths

    How much would weekly repayments be on a credit card with balance of $1000 and interest rate of 13.5%

    asked on October 29, 2018
  91. English

    If you want information about the link between heroin addiction and prescription drugs, including painkillers, which combination of search terms would give you the best results? (They are talking about if you search up the terms in ENCORE) Heroin addiction

    asked on October 12, 2018
  92. Vectors

    How much work is done by the orderly pushing a 85 kg person up a 5 m ramp inclined at an angle of 15° to the horizontal? I did W = (85)(9.8)(5)cos15, but to get the correct answer you are supposed to use (85)(9.8)(5)sin15 instead. Why do we have to use

    asked on June 7, 2018
  93. physics

    A box weighing 890N is pulled along a horizontal surface by means of a string which is at 30o above the horizontal. If the coefficient of kinetic friction is 0.2 and the box is accelerated at 0.8 m/s2, what is the tension in the string

    asked on November 26, 2017
  94. Math

    Find the values of the variables. [-12 -w^2] = [2k -81 2f 3 -14 3 Please help me. I don't know how to do this at all, and can you show your work so I can understand better. Thanks

    asked on November 16, 2017
  95. science

    how does a grassland follow conservation of mass

    asked on November 9, 2017
  96. Maths

    There are 40 children on a bus, there are 12 more boys than girls, how many girls are there on the bus?

    asked on August 22, 2017
  97. physics

    a cyclist travels 2.5km east, then 10km south and finally 5km west. determine the cyclist's overall displacement from their starting point.

    asked on February 9, 2017
  98. School

    Who is Jean Kessner?

    asked on January 23, 2017
  99. Physics

    A catapult of a spring constant 100N/M contains 2.0J of elastic potential energy when it is pulled back. What is the extension of the rubber band? I know that E= F/K but I don't know how to work out the force from the information provided, help would be

    asked on November 25, 2016
  100. Physics

    A particle moving at a velocity of 4.8 m/s in the positive x direction is given an acceleration of 3.4 m/s2 in the positive y direction for 4.4 s. What is the final speed of the particle? Answer in units of m/s.

    asked on October 11, 2016


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