1. geometric mean

    The geometric mean of two postitive numbers a and b is sqrt(ab). Show that for f(x) = 1/x on any interval [a,b] of positive numbers, the value of c in the conclusion of the mean value theorem is c = sqrt(ab) I have no idea how to do this! If the mean of a

    asked by Jen on November 5, 2006
  2. Trignometric

    i)The angle á lies between 0 and 90 and is such that 2tan sqaure á + sec square á=5-4tan á. show that 3tan square á +4taná-4=0 and hence find the exact value of taná ii)It is give that the angle â is such that cot(á+â) = 6.Without using a

    asked by Amr on September 4, 2016
  3. Chemistry- urgent help needed

    How do I prepare 40% v/v from 95% ethanol? When we say 95% ethanol, do we usually mean 95% w/w ethanol unless otherwise stated? Please show me the calculation steps to prepare 40% v/v from 95% w/w ethanol. Thanks.

    asked by annie on September 19, 2010
  4. math

    My sister is 9 1/2 years old my brother is 4 3/4 years younger than my sister how old is my brother show me how to get the answer

    asked by James on March 1, 2016
  5. maths

    in the fig Cis the midpoint of line segment AB and P is midpoint of line segment AC.show that PC=1/4 AB.

    asked by sanket sunil ghodake on November 19, 2016
  6. algebra

    what is an equation of a parobola with the given vertex and focus? vertex(5,4) and focus(8,4) Can someone show me the steps to get the equation please?

    asked by lee on February 21, 2013
  7. calculus

    Triangle ABC is an equalateral triangle, with O it's centroid. a) Show that vector OA + vector OB + vector OC = vector 0

    asked by Anonymous on April 24, 2010
  8. math

    If I give you $40 then the ratio of my money to yours is 4 : 5. On the other hand, if you give me $40, then the ratio is 8 : 1. How much money do both of us have? please show all steps

    asked by anonymous on March 5, 2017
  9. Maths

    The relation f is defined by f(x)={x²,0

    asked by Rose on August 1, 2018
  10. math

    . What’s the better deal: 1 lb. of Boars Head ham for $7.99 or ¾ lb of Boars Head ham for $5.49? Explain/show why.

    asked by beatrice on October 7, 2012
  11. Pre-Calc B

    How do I find zeros on a graph of a cubic function? I can tell that two of the zeros are -4 and 3 because they show on the graph, but how do I find the other?

    asked by Emma on January 20, 2012
  12. College physics

    A 0.006 00-kg bullet traveling horizontally with a speed of 1.00 x 10^3 m/s enters an 20.1-kg door, imbedding itself 10.9 cm from the side opposite the hinges as in the figure below. The 1.00-m wide door is free to swing on its frictionless hinges. At what

    asked by johnny on April 11, 2012
  13. SCIENCE help?

    I did this question in this way but 2 of them correct ,is anyone can help me with this question ,many thanks. Choose the words or phrases that most accurately complete the sentences below. Drag and drop your choices into their appropriate spaces. One of

    asked by john!!!!!!!!!!!!!!!!!!!!!!!!!!!! on November 9, 2013
  14. 9 word sentence, please help!!

    aamaesneadsiainnacedgthteohkhmecy * it's 9 words long * it has to do with sports * it rhymes those are my clues....please help.. Try these: http://www.ssynth.co.uk/~gay/anagram.html http://wordsmith.org/anagram/ http://www.unscramble.net =) Thank you for

    asked by megz on April 14, 2007
  15. Chem

    What molarity of a NH4NO3 solution has a pH of 5.220? Kb for NH3 is 1.8 x 10^-5. Choose one answer. a. 6.31x 10-6. b. 2.21 x 10-6 c. 5.56x 10-10. d. 0.065 I started by taking the inverse log of the PH to get (6.02*10^-6) then I was thinking its not the way

    asked by AMI on April 6, 2010
  16. SCIENCE(PHYSICS)

    a train is moving on a straight track n travels at a speed of72km/hr and passes a pole in 3 seconds. find the time taken by the train to pass the bridge of length of 540 m? Sir in the solution i understood why we will get27 sec. but why we will add 3 sec?

    asked by YASH on May 27, 2011
  17. Chemistry

    Solid Na2SO4 is added to a solution which is 0.012 M in Pb(NO3)2 and 0.048 M in AgNO3. Assume the volume remains constant. Ksp = 2.0 10-8 for PbSO4 and Ksp = 1.2 10-5 for Ag2SO4. (a) Which compound precipitates first? (b) What is the concentration of the

    asked by Gregory on March 15, 2013
  18. Written Commuincations

    How can I write a business solution for the following question. The trip schedule for Mexico during spring break has been cancelled due to bankruptcy of the bus company. You must tell 25 of your classmates that the trip has been cancelled and that have

    asked by Kim on November 24, 2007
  19. Chemistry

    The fictitious compound, pandemonium carbonate Pn(CO3)2 hase a Ksp=3.091x10^-9M3 in water at room temperature. Calculate the solubility of Pn(CO3)2 in an aqueous solution of 1.11 M pandemonium sulfate Pn(SO4)2 (aq) . Express your answer in units of

    asked by Odesa on December 11, 2012
  20. APChem

    Hi! Thank you for your help... A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 66.2 mL of KOH is ______M. (The answer is supposed to be 1.00X10^-7) How do I set this problem up? I

    asked by Kiki on March 21, 2010
  21. CHEMISTRY 1B

    A student finds that k = 0.0027 L/mol · s, and m and n are both 1. Calculate the expected rate if 6.0 mL of 0.10 M [S2O82− ] is mixed with 4.0 mL of 0.20 M [I − ]. Assume the final volume of the solution is 10.0 mL. I used the given molarities and

    asked by Joanaleine Ferrera on May 17, 2016
  22. chemistry

    Can someone please explain how to do this question? A 0.057M solution of a weak acid has a pH of 4.93. Determine the ionization constant, Ka, of the acid. a) 2.1 x 10^-4 b) 2.4 x 10^-9 c) 4.1 x 10^-8 d) 2.8 x 10^-7 e) 1.4 x 10^-10 -- Well, to be honest, I

    asked by polkadot on April 7, 2011
  23. calculus

    I posted this below, and no one answered. Please help with this very complicated question! Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation

    asked by Amy on April 19, 2011
  24. Physics

    The astronomical unit (AU, equal to the mean radius of the Earth’s orbit) is 1.4960E11 m, and a year is 3.1557E7 s. Newton’s gravitational constant is G=6.6743E-11 m^3kg^-1s^-2. Calculate the mass of the Sun in kilograms. (Recalling or looking up the

    asked by Roberto on May 3, 2011
  25. chemistry who helps me for me

    A 0.887g sample of a mixture of nacl and kcl is dissolved in water , and the solution is then treated with an excess of agn03 to yield 1.913g of agcl. Calculate the percent by mass of nacl in the mixture 1.913/143g/mol = 0.01337 who helps me

    asked by Ferda on January 18, 2014
  26. Physics

    The astronomical unit (AU, equal to the mean radius of the Earth’s orbit) is 1.4960E11 m, and a year is 3.1557E7 s. Newton’s gravitational constant is G=6.6743E-11 m^3kg^-1s^-2. Calculate the mass of the Sun in kilograms. (Recalling or looking up the

    asked by Roberto on May 3, 2011
  27. Physics

    The astronomical unit (AU, equal to the mean radius of the Earth’s orbit) is 1.4960E11 m, and a year is 3.1557E7 s. Newton’s gravitational constant is G=6.6743E-11 m^3kg^-1s^-2. Calculate the mass of the Sun in kilograms. (Recalling or looking up the

    asked by Roberto on May 4, 2011
  28. calculus

    I posted this below, and no one answered. Please help with this very complicated question! Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule differentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to the differential equation

    asked by Amy on April 21, 2011
  29. Chemistry

    Calculate the [H3O+] and pH of each polyprotic acid solution. (b) 0.116 M H3C6H5O7 I did part (a) just fine, but for some reason can't figure (b) out. Can someone help me with just the [H3O+] part to get me started? I already got 9.3e-3 and 1.4e-3 without

    asked by DeeDee on April 6, 2013
  30. chemistry (science)

    The addition of 50mL of 2.02 M NaOH to 50 mL of 2.00 M HNO3 at 22.0 degree celsius resulted in maximum temperature of 36.1 degree celsius with a total mass of the solution of 100.0 g. calculate molar heat of neutralization and compare it to the results

    asked by bee on October 30, 2017
  31. Chemistry

    An aqueous solution of KF is add dropwise to an aqueous micture containing 0.25M Ca2+ and 0.75M Mg2+ calcuate the minimum molarity of F that is nessaryvto initate the precipitation of each salt? Which precipitate first? Ksp of CaF2 :5.4x10^-9 Ksp of MgF2

    asked by Tom on November 21, 2015
  32. English

    I have a question about writing my thesis for my paper. The topic was war as a social disease and the three body paragraphs were Dissection & Numeration, Statement of Conflict/Problem/ and Solution, and Statement of Root Principle? How would I form my

    asked by Michele on February 14, 2009
  33. Dilution

    Please, if possible, check if my method of dilution is correct Problem: Given a very concentrated liquid PBS, dilute it to 1:15,000 My approach is to use serial dilution First: dilute it 15x (50ul of PBS + 750ul of water)... this will give 1:15 Second:

    asked by John on February 15, 2013
  34. Geometry Part 2

    A highway makes an angle of 6 with the horizontal.This angle is maintained for a horizontal distance of 5 miles.To the nearest hundredth of a mile, how high does the highway rise in this 5- mile section?Show the steps you use to find the distance.

    asked by Karen on April 15, 2013
  35. Math

    In Simplifying 7 to the 11th power and 7 to the 9th power, Alexis decides to use her calculator to find 7 to the 11th power and 7 to the 9th power indiviually before dividing. Show how Alexis could use the laws of exponents to arrive at the answer more

    asked by Anonymous on January 28, 2008
  36. Chemistry

    Use Lewis diagrams to show how electrons are shared to form covalent bonds in compounds with the following atoms. Write the formulas a) one carbon atom and four chlorine atoms i think i would share each of the four electrons of carbon with the chlorine

    asked by Anonymous on October 4, 2014
  37. Biostatistics

    Test the potency of a drug on 20 rats. Previous animal show that a 10-mg dose of drug is lethal 5% of the time within 1st 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours. What is the probability that 3 or more rats will die in

    asked by Cathy on June 8, 2013
  38. Geometry

    find 1 counter example to show the each conjecture is false. that means prove the follwing statment false. The product of 2 positive numbers is greater than either number. ok so I know product means to multiply but if you multiply you get a bigger number .

    asked by tori on August 22, 2007
  39. Physics-mechanics

    A satellite is placed in orbit, with a radius that is half the radius of the Moon's orbit. Find the period of the satellite in units of the period of the Moon. (sketch and analyze the situation, show all working so I can understand how you arrived at your

    asked by Rebecca on December 27, 2012
  40. statistics

    A sixth form class consists of 6 girls and 9 boys. Three students from the class are chosen at random. The number of boys chosen is denoted by the random variable X. Show that a)P(X=0)=120/2730 b)P(X=2)=1296/2730

    asked by Nabiha on December 3, 2011
  41. Physics-mechanics

    A satellite is placed in orbit, with a radius that is half the radius of the Moon's orbit. Find the period of the satellite in units of the period of the Moon. (sketch and analyze the situation, show all working so I can understand how you arrived at your

    asked by Rebecca on December 27, 2012
  42. Science

    I am trying to find an example of how to write a prediction for a Biology Lab Report. I think a prediction should be written as an if/when statement. Does anyone know of some where that I can find a lab report that includes a prediction(s)? All of the

    asked by Lori on April 1, 2008
  43. Writing

    Please grade, correct,and give feedbacks. Prompt: Colleges reward professors,who have significant research and teaching experience, with tenure. Once tenured, a professor holds his or her job without review and with little danger of being fired or

    asked by Anonymous on August 4, 2013
  44. Math

    5. The following random sample was selected : 4, 6, 3, 5, 9, 3. Find the 95% confidence interval for the mean of the population. 6. In a sample of 35 high school seniors, 14 of them are attending college in the fall. Find the 95% confidence interval for

    asked by Anonymous on May 9, 2013
  45. Math: Geometry

    ok so i am really confused on my assignment. So What we are suppose to do is take pattern blocks (a triangle, square, hexagon, rhombus, trapazoid, and small rhombus) and see how many can go around a central point. I figured out that there are 6 possible

    asked by Melissa on January 18, 2017
  46. Stats Class

    Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rate by subway riders are uniformly distributed

    asked by Amanda on April 11, 2014
  47. Physics

    A block is pushed 2m along a fixed horizontal surface by a horizontal force of 2N. The opposing force of friction is 0.4N. How much work is done by the frictional force

    asked by Queenesther on November 15, 2018
  48. physics

    The brakes of a truck cause it to slow down by applying a retarding force of 2350 N to the truck over a distance of 817 m. What is the work done by this force on the truck?

    asked by summer on July 8, 2013
  49. English

    When you are looking at a work by Monet, stand back at least fifteen or twenty feet. simple, compound, complex, compound-complex complex

    asked by Hayley on November 17, 2010
  50. Physics

    The brakes of a truck cause it to slow down by applying a retarding force of 7760 N to the truck over a distance of 870 m. What is the work done by this force on the truck?

    asked by Chris on March 1, 2015
  51. math

    Lisa can make a costume twice as fast Justin can. If they both work together, they can make it in 8 hours. How long will it take Mary to make the costume if he works alone?

    asked by Chris on July 30, 2014
  52. Formal Logic Question

    Please help me work out the following formal logic problem.... Given the premise that whoever smelt it dealt it, does it necessarily follow that whoever dealt it must also have smelt it? No. For it is possible that nobody could have smelt it, yet the

    asked by Tyler on April 18, 2007
  53. Math

    Robert is writting a poem. The poem is divided into 5 stanzas and is on 2 pages. There are 60 lines in the poem. How many lines are in each stanza? shoe work please

    asked by Carlos on March 29, 2011
  54. Algebra

    Determine whether the given numbers are solutions of the inequality. t - 8 > 2t - 3 The given numbers are: 0, 3.3, -9, -3 I understand the problem and how to figure it out. Its just that when I tried this problem, none of the numbers worked. Did any work

    asked by Carrie on January 15, 2009
  55. Physics

    The brakes of a truck cause it to slow down by applying a retarding force of 8740 N to the truck over a distance of 1130 m. What is the work done by this force on the truck?

    asked by Emily on November 14, 2012
  56. physics

    what is the work done a bringing a charge from infinity to a point P, if the point P is 5m to the positive y-axis from a charge A(5uC) which is 3m to the left of another charge B(-2uC)?

    asked by jay on February 20, 2016
  57. help! due tommorrow

    an assortment of coins contains 20 pennies, 2 nickels and 6 dimes what percentage of the coins are nickels? ( in the book the answer says 7% nickels) i want to know how to work out the problem

    asked by bbb444 on September 13, 2011
  58. algebra

    Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form Y= mx+b (6,8); x+6y=5 The equation of the line is Y= I do not how work this problem help me, please

    asked by Johnnie on March 17, 2009
  59. Calculus

    integral 0 to sqrt(3) dx/sqrt(4-x^2) I don't understand why the answer is pi/6. I get pi/3. Thanks for the help! Work: u=x/2 du=1/2dx 2du=dx 2/2sqrt(1-u^2) sin^-1(x/2) sin^-1(sqrt(3)/2)= pi/3

    asked by Anonymous on June 4, 2008
  60. physics

    A spring has k=88 N/m. create a graph and use the graph to determine the work needed to stretch the spring from x = 4.1 cm to x = 5.8 cm, where x = 0 refers to the spring's unstretched length.

    asked by Anonymous on January 2, 2012
  61. math

    A ball and a box weigh 900 grams. Two identical balls and the same box weigh 1.35kg. What is the mass of the box? How do I work this out?

    asked by milli on May 10, 2018
  62. Math

    How would you work this problem? Thanks! Josie paid $72.00 for a baseball glove. Price reflected 10% discount off regular price. What was regular price?

    asked by jojo on September 9, 2008
  63. Math

    Can someone check my work and see if I did this correctly? Problem: 9^(x+6)=3^x ln9^(x+6)=ln3^x (x+6)*ln(9)=x*ln(3) (x+6)/x=ln(3)/ln(9) x/x+6/x=0.49999977 1+6/x=0.49999977 6/x=0.49999977-1 6/x=(-0.5000002) x=6/(-0.5000002) x=(-11.9999952) is this correct?

    asked by Tim on April 13, 2008
  64. Physics

    A +35 µC charge is placed 42 cm from an identical +35 µC charge. How much work would be required to move a +0.55 µC test charge from a point midway between them to a point 8 cm closer to either of the charges?

    asked by Anonymous on February 4, 2013
  65. Math

    What is 1 7/12 - 3/20 equal to? I tried to do this question but I couldn't quite get the answer. For the directions of the work, its says use the least common multiple as the denominator and when I came across this one, I couldn't quite get the answer. If

    asked by Nat on March 27, 2017
  66. physics

    A +30 µC charge is placed 44 cm from an identical +30 µC charge. How much work would be required to move a +0.69 µC test charge from a point midway between them to a point 14 cm closer to either of the charges?

    asked by Nick on January 17, 2012
  67. canterbury tales

    My question is, List the Friar's talents. What do you think these talents contributed to his work for the Church. However, I can only find the Friar's tale. It doesn't say anything about his talents.

    asked by Tabby on November 29, 2007
  68. Algebra

    Which of the following types of information is suited for display on a scatter plot? A.relationship between favorite color and age B.relationship between number of pets and favorite TV show C.relationship between hours of exercise and number of siblings

    asked by Cassie on March 4, 2013
  69. Civics

    What motivated the Founding Fathers to include the phrase "We the People" in the Preamble of the U.S. Constitution? So far I have: The Founding Fathers did this because they wanted to show that the Preamble of the U.S. Constitution was made by the people

    asked by Baxie on November 5, 2014
  70. statistics

    In a poll of voters in a certain city, 32% said that they backed a bill which would limit growth and development in their city. The margin of error was reported as 1.7% with 90% confidence. Determine the bounds for the confidence interval. A. (88.3%,

    asked by debbie on October 23, 2011
  71. math/statistics

    The data show the time intervals after an eruption (to the next eruption) of a certain geyser. Find the regression equation,letting the first variable be the independent (x) variable. Find the best predicated time of the interval after an eruption given

    asked by slomomo on March 6, 2015
  72. Math-please help

    Hallie is trying to win the grand prize on a game show. Should she try her luck by spinning a wheel with 6 equal sections labeled 1 to 6 and hope she gets a 5, or should she roll two number cubes and hope she gets the same number on both cubes? Explain. I

    asked by Rose on May 29, 2018
  73. chemistry

    The density of diamond is 3.51g/cm^3,and the density of platinum is 21.43g/cm^3.If equal masses of diamond and platinum are transferred to equal volumes of water in separate graduated cylinders,which graduated cylinder would have the greatest volume

    asked by summer on January 22, 2017
  74. physics

    A hollow cylinder, a solid cylinder, a hollow sphere, and a solid sphere roll down a ramp without slipping, starting from rest. The ramp is 0.25 m high. All the objects have radius 0.035. What are their final speeds? Please show what equation you used and

    asked by Caroline on November 5, 2015
  75. MATH

    Englewood averaged 17 problems right on the math decathlon. Avalon Park Elementary scored an average of 14 problems right. Which equation show the difference, (d) between the averaged points scored by the Engelwood and Avalon Park? a. d=17x14 b. d=17-14 c.

    asked by vera on February 10, 2013
  76. Physics

    A cyclist starts from rest and coasts down a 6.5∘{\rm ^\circ} hill. The mass of the cyclist plus bicycle is 95kg{\rm kg} . The cyclist has traveled 270m{\rm m} .What was the net work done by gravity on the cyclist? How fast is the cyclist going? Ignore

    asked by Anonymous on May 10, 2014
  77. writing sentences and paragraphs

    Paragraph 1 Background You’ve applied for a specific job in your field of study. The Human Resources Department arranges an interview and tells you to bring with you a polished piece of writing for them to evaluate your writing skills. The paragraph must

    asked by me too on February 22, 2010
  78. Science

    What is the distance an object travels per unit of time? It's called the speed Depends on the velocity (speed), if the speed is 10mph, then the object would travel 10 miles (distance) per hour (unit of time). I'm unsure what your answer is saying, because

    asked by Ginger on September 18, 2006
  79. Physics

    A rope of mass m uniformly distributed along it's length l can slide without friction on a horizontal table. At instant t=0 the hanging part of the rope has a length b, and the rope is held at rest. When it is left, the rope begins to slide. At instant t

    asked by Jessy on October 8, 2017
  80. physics

    a person 0f mass m = 60 kg walks along the radius from the periphery to the center of a circular platform of moment of inertia= 200kgm square and radius r = 3m. the disk is a rotating frictionless with angular velocity= 0.3 rad\s.find the angular velocity

    asked by John on May 1, 2012
  81. adverbs,adjectives in comparison

    t: Review - Adjectives, Adverbs, and Comparison • Use at least five adverbs and five adjectives to write a 150- to 300-word review of a movie, sporting event, musical performance, or television show. • Bold each adverb. • Underline each adjective.

    asked by erica on November 13, 2010
  82. History

    15.)How did the cotton gin, with it's interchangeable parts, help further the industrial Revolution? A.)Workers picketed against assembly lines. B.)It helped increase farmers' cotton yields.*** C.)It paved the way for mass production. D.)It sent workers

    asked by #FreeGucci on March 29, 2016
  83. Physics

    How much work does it take for the average person (Weight = 700 N) to climb a 10-story tall building (consider each story to be about 3 m)? What fraction is this of the energy in a typical candy bar? (Ecandy bar = 250 Calories and 1 Calorie = 4186 Joules)

    asked by Janiqua on March 11, 2016
  84. language arts

    which question should you ask during your third read of multi draft reading process? 1. who is the speaker, or the voice that "says" the words of the poem? 2. How has the work expanded my ideas-or my imagination? 3. What do the word choices and imagery

    asked by ben on January 27, 2015
  85. Chemistry

    Find the pH of each mixture of acids. 0.115 M HBr and O.125 M HCHO2. I TRIED DOING THIS PROBLEM THE SAME WAY AS THE ONE BEFORE BUT IT DIDN'T WORK. THE PH SHOULD BE 0.939. I did HBr as stronger acid and got concentration of H+ and put it into the ka

    asked by L.Bianchessi on February 27, 2012
  86. reading

    Who is the antagonist in the book, Death Be Not Proud? Also, what type of conflict is it and what is the climax of the story? Is the climax when Johnny starts having a stiff neck and they discover he has a tumor in his brain? And what is the dialect of the

    asked by aj on August 30, 2007
  87. 8th grade homework

    Please help me I beg of you! My math teacher is awful and I have no idea how to do my pretest and she's picky about showing my work so it would be helpful if you could explain :) 1.six is subtracted from a number. The result is devided by four. This result

    asked by Anna on September 14, 2014
  88. Physics

    A pinball machine has a spring with spring constant of 125N/m. A 65g ball is placed on the spring and the spring is compressed 5cm. How far along the playing surface makes a 15 degrees angle with the horizontal? ignore friction. How to do this using

    asked by Sash on April 15, 2013
  89. Calculus

    A fully plane has a constant acceleration while moving down a runaway. the plane requires .7 mile of runaway and a speed of 160 miles per hour in order to lift off. what is the planes accelearation? i need the formula cause the one i have doesnt work cause

    asked by Nancy on December 8, 2009
  90. Physics

    Yep its me again... sorry for re-posting this question but I am quite desperate here and I need to have this question answered, sorry if that sounds rude. IF 2.0 J of work is done raising g apple how far is it lifted? I know W= Fd hence I divided instead

    asked by Edwin on October 24, 2010
  91. educatial technology

    which of the following statements is true of a time management plan? a. it is a work in progress that will need to be altered many times b. the plan you create is the one you should stick with c. you dont need to schedule breaks or free time d. it isnt

    asked by Amy on February 23, 2018
  92. Chemistry

    The molar enthalpy of combustion of demand is -6.78KJ/mol.What mass of decane would have to be burned in order to raise the temperature of 500ml of water from 20 degrees Celsius to 55 degrees celsius. I tried using ndeltaH=mcdeltat. But it didn't work.

    asked by Kelvin on October 17, 2016
  93. physics

    Orange light with a wavelength of 6.00x102nm is directed at a metallic surface with a work function of 1.60eV. Calculate: a) The maximum kinetic energy of the emitted electrons b) Their maximum speed c) The cutoff potential necessary to stop these

    asked by Anonymous on June 6, 2013
  94. Physics 101 help (dumb it down please)

    A 12,000 kg truck moving to the right at 22 m/s collides with and sticks to a 1200 kg car moving to the right at 16 m/s. What speed do the two vehicles move after the collision in what direction Also Calculate the Kinetic energy converted to heat sound and

    asked by Haley on October 20, 2015
  95. chemistry

    How do i calculate the effective nuclear charge of a 3d electron of copper? what is the zeff. for a electron in the 3d orbital of copper. i looked up the answer to be 13.20, but i calculated 13.05 this is my work: (1s2)(2s2 2p6)(3s2 3p6)(3d10)(4s1)

    asked by mandy on November 10, 2008
  96. English

    Complete the sentences. My answers are with capital Amanda had become an expert in her field by the time she is 25. She told us how SHE HAS BEEN WORKING her way through college when the company HAD RECRUITED her. She told us SHE’D BEGUN TO WORK as an

    asked by Alex on October 11, 2017
  97. SCIENCE

    I have to find research about Jan van Helmont's work on Spontaneous Generation and I am having trouble finding info. about it and how he conducted the experiment..also i have to figure out the strengths and weaknesses of the experiment and is it considered

    asked by Amanda on May 24, 2008
  98. math

    i cannot seem to make this work. If two trains leave the station at the same time, one traveling north and the other traveling south. the express travels 14 mph faster than the local. after 3 hours they are 315 miles apart. what is the rate of each train.

    asked by alicia on February 7, 2011
  99. Physics

    A body of mass 10kg is to be raise from the bottom to the top of an inclined plane 5m long and 3.0m off the ground at the top assuming a frictionless surface,how much work must be done by the force parallel to the plane pushing the block up to a constant

    asked by collins on October 31, 2018
  100. Geometry

    find the surface area of a right cylinder with a diameter of 4cm and a height of 6cm. Round to the nearest hundredth. Book answer is 100.53cm^2 I came up with 150.79cm^2 my work: 2rr(4)6)=150.79cm^2 What did I do wrong??

    asked by mary on April 18, 2011

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