Most popular questions and responses by N
  1. physics

    A 0.10 kilogram ball dropped vertically from a height of 1.0 meter above the floor bounces back to a height of 0.80 meter. The mechanical energy lost by the ball as it bounces is aprox. a. 0.080 J b. 0.20 J c. 0.30 J d. 0.78 J

    asked on January 28, 2013
  2. Chemistry

    A sample of nitrogen occupies a volume of 300ml under a pressure of 380 torr at -177C. What would be the volume at STP? I know the answer is 430mL but I don't know which equations to use to formulate the calculation.

    asked on May 1, 2014
  3. physics

    a block of mass 3 kg rests on a smooth table and connected to another block of mass 2 kg, after passing over and ideal pulley, the block of mass 2 kg is released. how long does it take the block to travel 80 cm

    asked on August 12, 2014
  4. Math

    The 112th Congress of the United States of America has 535 members, of which 87 are women. An alien lands near the US Capital and treats members of Congress as a random sample of the human race. He reports to his superiors the 95% confidence interval for

    asked on February 14, 2017
  5. Physics

    A charge q1 of -5.00*10^-9C and a charge q2 of -2.00*10^-9C are separated by a distance of 40.0cm. Find the equilibrium position for a third charge of 15.0*10^-9C

    asked on April 22, 2014
  6. math need help ASAP

    use benchmark to estimate the sum 3/5 + 3/17

    asked on October 17, 2016
  7. physics

    An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval? a.5.3 m/s2, upward b.2.0

    asked on October 17, 2015
  8. Physics

    A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and incline is 0.10. Find the force

    asked on March 11, 2015
  9. Chemistry

    The molten lead obtained from the blast furnace contains 0.1% of silver dissolved as an impurity. The silver is removed by: -adding zinc to the mixture of molten lead and silver at 350'C and removing the mixture of molten zinc and silver that forms on top

    asked on February 27, 2019
  10. Science

    A boy moves on a skateboard at a constant velocity of 3m.s . The combined mass of the boy and the skateboard is 40kg. He catches a bag of flour of mass 5kg that is thrown to him horizontally at 6m.s . Determine the velocity of the boy after catching the

    asked on January 16, 2016
  11. Physics

    An 80.0 kg rollerblader is at rest at the top of a 100 m hill at a 7o incline. The coefficient of friction on the hill is 0.110. What is the roller blader's kinetic energy at the bottom of the hill?

    asked on August 2, 2016
  12. chem 161

    What volume of 0.114 M NaOH are needed to neutralize 25.0 mL of 0.250 M H3PO4?

    asked on May 6, 2016
  13. math

    Elizabeth has 1 7/10 as many plants as rosalie has in her garden. If Elizabeth has has 51 plants, how many plants does rosalie have in her garden?

    asked on December 17, 2015
  14. physics

    Before starting this problem, review Conceptual Example 7. The force vector A has a magnitude of 97.0 newtons (N) and points due east. The force vector B has a magnitude of 107 N and points 71.4 ° north of east. Find the (a) magnitude and (b) direction of

    asked on March 4, 2015
  15. Chemistry

    The Haber process is used to synthesize ammonia (NH3) from N2 and H2. The change in standard Gibbs free energy is ΔG°rxn = -16 kJ/mol A. Calculate the equilibrium constant for this reaction B. Calculate the ΔGrxn when you have 2 atm of NH3 (g), 2 atm of

    asked on February 12, 2015
  16. Chemistry

    A 35.00 mL sample of water at 30.0°C is placed in an open container with an external pressure of 1.00 atm. 30.0 kJ of heat is added to the water sample. The density of water is 1 g/mL. (a) How many grams of liquid water remain at the end of the process?

    asked on February 11, 2015
  17. physics

    A stone is dropped from rest at the top of a mine shaft. It takes 58 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft? The acceleration of gravity is 9.8 m/s2 .

    asked on October 27, 2013
  18. math

    complete the pattern starts at 0.22 _ _ _ ends at 0.84 fill in the blanks

    asked on September 4, 2012
  19. math

    The mean age of the 43 presidents of the United States (as of 2011) on the day of inauguration is 54.6 years, with a standard deviation of 6.3 years. A researcher constructed a 95% confidence interval for the mean age of presidents on inauguration day. He

    asked on February 15, 2017
  20. Social Studies

    what was the first of two important changes that marked emperor Constantine's rule

    asked on August 16, 2016
  21. math

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

    asked on November 7, 2012
  22. Chemistry

    Elements A and B combine to form two different compounds. The first compound contains 15.0 grams of substance A, and 8.60 grams of substance B. It can be represented by the formula A2B (subscript 2). The second compound contains 5.0 grams of substance A,

    asked on November 2, 2016
  23. stat

    three boxes contains 12 electric bulbs in each one box(1) contains 4 defective bulbs box (2) contains 3 defectives bulbs Box (3) contains 5 defectives bulbs a box is selected randomly and one bulb is drawn 10 what is the probability that the selected bulb

    asked on November 8, 2016
  24. english

    What are three central assumptions of the american dream

    asked on November 2, 2015
  25. math

    what is the process for solving the following question? John is 72 inches tall and casts a 40 inch shadow. A monument casts a 24 foot shadow. How tall is the monument?

    asked on February 24, 2012
  26. Rate and Sped Algebra

    It takes Sisyphus two days to carry a pile of rocks up a hill. When I helped out, it took us only 1.2 days to carry all of the rocks. How long would it take me to carry the rocks by myself?

    asked on April 11, 2017
  27. Langston Hughes Dream Deferred

    Hello! My assignment: Analyze the poetic techniques that allow the poet to communicate his tone. Use the terms from this unit as effectively as you can. Here is my analysis. Does it sound alright? In the poem “Dream Deferred”, Langston Hughes uses a

    asked on December 22, 2014
  28. chemistry

    The breakdown of p-nitrophenylphosphate at pH 2.6 is a first order hydrolysis process.. a) 12.5mmol of NPP were dissolved in 200mL of water at 77degrees celcius after 50mins the amount of NPP dropped to 10mmol. Calculate the average rate of this reaction

    asked on April 12, 2014
  29. Pottery

    how do the poetic elements increase my interesting in the poem of "How I Learned English"

    asked on April 25, 2017
  30. chem 161

    What mass of precipitate will be formed when 25 mL of 0.532 M silver nitrate is mixed with 25 mL of 0.333 M NaCl?

    asked on May 6, 2016
  31. Chemistry

    A flexible balloon containing 1.5 mol of... ideal gas at constant pressure of 1.5 at... 100 °C. Calculate the change in intern...‡ (ΔE) of the gas.

    asked on February 11, 2015
  32. science

    if you have two samples of the same volume. the mass of sample A is higher than that of sample B. which sample has the greatest density?

    asked on February 16, 2014
  33. Organic Chemistry

    Design a procedure to separate a mixture of alcohols containing methanol, ethanol, 1-pentanol. Explain, with references to intermolecular forces, why this separation method is effective in this situation.

    asked on March 27, 2012
  34. chemistry

    When hydrazine (N2H4) is burned in a 259-g brick container, the temperature of the brick increases by 5.13 C. Calculate the quantity of heat released in this reaction. The specific heat of the brick is .840 J/(g C)

    asked on October 20, 2011
  35. math

    factor 6x^2+17xy+12y^2

    asked on June 18, 2010
  36. math word problem

    The city council has decided to add a 0.3% tax on motel and hotel rooms. If a traveler spends the night in a motel room that costs $55 before taxes, how much will the city receive in taxes from him?

    asked on March 3, 2009
  37. Physics

    A force of 35.0N is exerted onto a 12.0kg block and the block moves 42.0m. How much work is done?

    asked on August 2, 2016
  38. Trig

    Tan^2= csc^2 tan^2 -1

    asked on December 8, 2015
  39. physics

    A box has a mass of 0.345 kg. It is on a very smooth (frictionless) horizontal surface and is acted upon by a force of 3.76 N at an angle of θ = 57.1° with the horizontal. The magnitude of the acceleration of the box is m/s2?

    asked on October 2, 2014
  40. Grammar

    What kind of paragraph is this? Descriptive, Narrative, or Expository? The place I would like to visit most is heaven. Having the opportunity to be in a place with no sickness, suffering, or misery would be paradise. To eat dinner with Jesus Christ would

    asked on July 13, 2014
  41. Math

    The m angle is 30 times more than twice angle B. If angle A and angle B form a linear pair find the measurement of both angles.

    asked on September 8, 2013
  42. math

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

    asked on November 7, 2012
  43. english

    what photographe is famous for images of Dust Bowl victims

    asked on November 2, 2015
  44. science

    Put the following events in order as an impression is processed by crime scene investigators -Make a cast of impression -set up crime scene tape -photograph -Take measurements

    asked on October 27, 2015
  45. science

    Put the following events in order as an impression is processed by crime scene investigators -Make a cast of impression -set up crime scene tape -photograph -Take measurements

    asked on October 27, 2015
  46. Science

    Please help!!! You mix 100 millimeters of 10 degrees Celsius water and 100 millimeters of 90 degrees Celsius water. What is the final temperature?

    asked on September 20, 2015
  47. Discrete Math

    So, the question I got was: ∀x,(x =/= 0) → (∃!y, xy = 1) I'm really confused about what the "∃!y" means in this context, because the way I'm interpreting the question is: "For all x (when x is not equal to 0), there does not exist a y such that x*y

    asked on February 18, 2015
  48. English

    I'm working on a complements assignment, and I understand what they are, but I'm a little thrown off by something: Take the sentence, "At first this Saturday had been a warm, sunny day." Saturday is the subject, had been is the verb phrase, and the

    asked on August 19, 2013
  49. math

    In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

    asked on November 7, 2012
  50. math

    A reciepe for tomato and pasta salad calls for 32 ounces of tomatoes and 4 cups of pasta.the recipe makes 8 Servings.If you only wnat to make enough for 2 servings, how much of each ingredient should you use/

    asked on September 1, 2011
  51. AP US Government

    What features of the Constitution make it difficult for government to do or achieve anything? Why were they included? *That is the question, but I am completely lost on how to answer it.

    asked on September 15, 2010
  52. science

    a 50kg crate is lifted to a height of 10 meters how much potential energy does the crate have after being lifted?

    asked on June 18, 2010
  53. Trig

    (tan/cot)- (sec/ cos) Also I need help with tan sin +cos = sec

    asked on December 8, 2015
  54. Trig

    (Cos/1-sin)- tan

    asked on December 8, 2015
  55. Trig

    (Tan/cot)- (sec/cos)

    asked on December 8, 2015
  56. Trig

    (Cos/1-sin)- tan

    asked on December 8, 2015
  57. english

    what two things happened in the prohibition period that had to do with oceans

    asked on November 2, 2015
  58. science

    what type of crime scene is most likely to contain toolmarks

    asked on October 27, 2015
  59. Math

    What is this written in postfix notation: !(!((5-10)*(4-(9/2)) > 60)-(((5*7)/(4/(5+3)))=15))

    asked on March 5, 2015
  60. MATH


    asked on March 3, 2014
  61. MATH


    asked on March 3, 2014
  62. Calculus

    How would you go about finding the derivative of y=1/(3x^2)-5/(2x)?

    asked on July 17, 2013
  63. college

    Q. A soccer ball is kicked from the ground. When it reaches a height of 5.74 m, the velocity is v=5.86i+7.50j m/s. a) Determine the maximum height that the ball reaches. b) Determine the total horizontal distance travelled by the ball. c) What is the speed

    asked on October 17, 2010
  64. math

    If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for the to pain the house together?

    asked on March 3, 2009
  65. Chemistry

    What is the diameter of a potassium atom?

    asked on October 28, 2008
  1. UGRENT HELP, math

    C A B B A A B D A D B C A B B B B A A B A B C C C C B C C

    posted on May 10, 2019
  2. chemistry


    posted on April 10, 2019
  3. Math


    posted on April 2, 2019
  4. ELA

    Im not sure about these answers but I put 1.personfictaon 2.The air was filled with the intense scent of many flowers 3.lines 1 and 2 4. The flower patch is round and compact 5.smell 6.delighted 7. The sun shined on the orchises and their spears 8. four

    posted on March 28, 2019
  5. ELA

    Mines is Lesson 19: Rhythm and Rhyme Unit Test and its Unit 2

    posted on March 28, 2019
  6. Language Arts


    posted on March 27, 2019
  7. ELA

    Can someone finish the test and give the real answer and hurry because I'm failing In ELA.

    posted on March 27, 2019
  8. Math

    1.C 2.D 3.B 4.C 5.A 6.D 7.C 8.C 9.B 10.A, B, D

    posted on March 26, 2019
  9. algebra

    Where does the 102400 come from

    posted on March 12, 2019
  10. Expected Value?


    posted on February 11, 2019
  11. socialstudies(CHECK ANSWERS)

    7 is what?

    posted on January 26, 2019
  12. Math


    posted on January 19, 2019
  13. calculas

    Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places.) g(x) = 4 sin x, [0,

    posted on November 27, 2018
  14. Social Studies

    thx lun

    posted on November 7, 2018
  15. physics


    posted on November 6, 2018
  16. physics


    posted on October 30, 2018
  17. English - The Red Badge of Courage

    y’all are so dumb 50% of these are wrong

    posted on October 26, 2018
  18. Math

    The alien's report: The population of Earth is adequately large, we assume this is an SRS, and with p-hat being approximately .16, n*p-hat and n*(1 - p-hat) are both greater than 10. Therefore we can use the normal curve. We will use the confidence

    posted on October 9, 2018
  19. Math-Statistics

    Normal percentiles for common confidence levels Confidence level 80% 90% 95% 98% 99% z∗ 1.282 1.645 1.960 2.326 2.576 .195 ± 1.645(.009) .195 ± .014805 0.180195 to 0.209805

    posted on October 3, 2018
  20. maths

    Someone answer!!!

    posted on June 3, 2018
  21. Chemistry

    n n

    posted on May 21, 2018
  22. Health

    What answer is it? A B C or D?

    posted on May 7, 2018
  23. P.E/Health

    smile more is right

    posted on May 2, 2018
  24. Social studies


    posted on April 30, 2018
  25. Social Studies

    C A b

    posted on April 30, 2018
  26. Science

    C B B D is correct

    posted on April 29, 2018
  27. Science--HELP!!

    C B C A A

    posted on April 29, 2018
  28. Science

    Correct @yolo.

    posted on April 29, 2018
  29. math functions

    unit 5 is correct for connexus

    posted on April 27, 2018
  30. Math "Need Help Asap"!

    sierra correct

    posted on April 27, 2018
  31. math


    posted on April 27, 2018


    posted on April 25, 2018
  33. Physics


    posted on April 5, 2018
  34. math


    posted on April 2, 2018
  35. Physics

    50 m/s is faster than 140km/h

    posted on March 27, 2018