Questions and answers by visitors named katie


  1. Suppose that you heated a sample of a hydrated ionic compound in a test tube. What might you expect to see inside the test tube, near the top of the test tube? Explain

    please i really am stumped on this question...

  2. Solve for y, then find the value of y when given x = –2.

    6x = 7 – 4y

  3. Which one of the following statements is true?

    Question 6 options: Natural selection works on variation already present in a population. Natural selection works on non-heritable traits. Individuals evolve through natural selection. Organisms evolve

  4. Which of the following defines valid reasoning?

    reasoning that reflects strong emotion reasoning that someone has used before reasoning that is well-founded reasoning that persuades the audience Which of the following describes a claim? a disappointing

  5. A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

  6. a) How many moles of atoms are in 7.00 g of 13C?

    Answer "0.538" mol 13C b) Based on your answer in Part A, calculate the number of atoms in this amount of 13C? Answer "3.24×10^23" 13C atom c) Based on your answer in Part B, how many electrons are in this

  7. The following reaction is a single-step, bimolecular reaction:

    CH3Br + NaOH --> CH3OH + NaBr When the concentrations of CH3Br and NaOH are both 0.135 M, the rate of the reaction is 0.0070 M/s. (a) What is the rate of the reaction if the concentration of

  8. What is the pH of a 2.8 M solution of HClO4?

  9. From on point on the ground the angle of elevation to the peak of a mountain is 10.38 degrees and from another pont 15,560 feet closer to the mountain, the anle of elevation is 14.67 degrees. Both point are due south of the mountain. What is the height of

  10. Anybody help me with this?

    A disk with mass m = 6.5 kg and radius R = 0.41 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.4 m from the rope and at a frequency f = 19.4 rev/s (with a direction shown by the arrow).

  11. A brother and sister are standing next to each other at rest on a surface of frictionless ice. The brother’s mass is exactly twice that of his sister’s. The sister suddenly pushes her brother. As a result, the sister moves with kinetic energy K. What

  12. Which of the following set of quantum numbers (ordered n, ℓ, mℓ, ms) are possible for an electron in an atom?

    Check all that apply. -4, 3, 1, 1/2 2, 1, -2, 1/2 4, 2, 1, -1/2 4, 2, -1, -1/2 2, 4, 1, -1/2 5, 3, -3, 1/2 5, 3, 4, 1/2 3, 2, 0, -2

  13. tennis ball rolls off the edge of a tabletop 0.900m above the floor and strikes the floor at a point 1.60m horizontally from the edge of the table.

    A: Find the time of flight of the ball B: Find the magnitude of the initial velocity of the ball. C: Find the

  14. How long will it take a sample of polonium-210 with a half-life of 140 days to decay to one-sixty-fourth of its original strength?

  15. 4xsquared+ 4x -3 =0


  16. What is the molecular geometry for SH2?

    1. Bent 2. Trigonal planar 3. Tetrahedral 4. Liner

  17. A reflecting telescope contains a mirror shaped like a paraboloid of revolution. If the mirror is 4 inches across at its opening and is 3 inches deep, where will the collected light be concentrated?

  18. After looking at China's healthcare system and service, why are these things that they (China) have, be considered in the United States and why?:

    - Advanced degrees shouldn’t be required to become a practicing physician in hospitals or clinics - Bigger

  19. how many moles of N2 are needed to react with 0.500 mol of lithium

  20. i need some help answers

  21. Which of the following needs beginning, middle, and an end?

    a. plot b. theme c. Character d. setting

  22. Which of the following would have been an event Georgia's Liberty Boys might have participated in?

    A A court session to decide the punishment of those that participated in the Boston Tea Party. B A meeting in which they discussed ways to protest the acts

  23. Two identical uniform bars are held on a horizontal surface by sliding a vertical peg through their centers as shown above. In both cases, objects of equal mass slide with negligible friction toward the bars with equal speeds. In Case 3, shown above left,

  24. how does The Minimum Wage Battle someone's life

  25. Evaluate the following: “... his character contained no pretension...The disquisitions upon death and suicide were calculated to fill me with wonder” (Shelley 131).

    from the book Frankenstein but i don't understand and i am having a lot of trouble

  26. Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.

    A circle with radius labeled 23 yards Find the circumference of the circle (use 3.14 for pi). Show your work. Round to the nearest tenth.

  27. You may use a calculator to complete this assessment.

    Find the area of the triangle. A triangle is drawn with the longest, horizontal side labeled 22 feet. A vertical dashed line labeled 7 feet is drawn to the opposite vertex. A small square is placed along

  28. . A three-foot child casts a shadow that is five feet long. The height of a nearby flagpole is nine feet. Find the shadow length of the flagpole.

    plz help

  29. 1. What are three powers enumerated to the House of Representatives?

    2. Define implied powers and the “clause” that grants Congress implied powers?

  30. An object moves along a straight line and

    the velocity as a function of time is presented by the above graph. a. Find the acceleration of the object for the time intervals: 0-5 s, 5 s- 10 s, 10 s-15 s, 15 s – 20 s, 20 s – 25 s, and 25 s – 30 s. b.

  31. Brandon's furniture store buys a sofa at a wholesale price of $97.00. If the markup rate at Brandon's Furniture store is 40%, what is the markup for the sofa?

  32. What does it mean to have political legitimacy?

    i keep looking up on google but i still don't understand when they explain. Please help!

  33. gabriella volunteers 15 hours in a week. How many weeks in a year would that total in?

    - 10 hrs? - 4 hrs? - 3 hrs? - 2 hrs?

  34. An irrigation drip arm is 28 feet long and pivots about a center one revolution each hour. A “drip hole” H is located 28 feet from the pivot point.

    (a) What is the linear speed of H in units of feet/hour ,feet/minute ,feet/second , and inches/second .

  35. The variable y is directly proportional to the variable x. If y = 10 when x = 6, what is the value of y when x = 15? A) 20.5 B) 25 C) 30 D) 35

  36. What is one explanation for Nigeria to have a mixed economy with strong command economy elements?

    A) Nigeria's government is a monarchy. B) Nigeria's government has a long tradition of stability. C) Nigeria's government had a long period of military

  37. You make dog collars with materials totaling 85.00. and want to make a profit of 90.00. how much will each collar be

  38. c + ab^2 for c = 15, a = -4, and b = 10.

    Please explain this question i'm so confused, i already know 15 is c. But i'm not sure about the other part.

  39. To which subset of real numbers does -4.6 belong?

    A) Integers B) Irrational Numbers C) Rational Numbers**** D) Integers and Rational Numbers

  40. What is the algebraic expression for the word phrase, "31 less than k and 15"

    A) 31k + 15 B) k - 31 + 15 C) 31 - k + 15 D) 31 < k + 15****

  41. simplify the expression (7+5)+4x13-2

    12+4x13-2 12+52-2 64-2 62 am i right?

  42. Roman glory had lasted for approximately how long before the last emperor was defeated?

    A. 500 years B. 2,000 years C. 1,500 years D. 1,000 thanks so much!

  43. A nonconducting sphere 1.9 m in diameter with its center on the x axis at x = 4 m carries a uniform volume charge of density ρ = 7.6 µC/m3. Surrounding the sphere is a spherical shell with a diameter of 3.8 m and a uniform surface charge density σ =

  44. How many 10cm strips can be cut from a length of 5m 60cm?

  45. A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 1.90 fg (where a femtogram, fg, is 10−15g) and is swimming at a velocity of v = 2.00 μm/s , with an uncertainty in the velocity of 3.00 % . E. coli

  46. 1) In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 21.0 mi/gal , how many liters of gasoline would you need to buy to complete a 142-km trip in Europe? Use the following conversions: 1km=0.6214mi and 1gal=3.78L.


  47. A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.9 kg and the sign has a mass of ms = 15.3 kg. The length of the beam is L = 2.55 m. The sign is attached at the very end of the beam, but the horizontal wire holding up

  48. A uniform disk with mass m = 9.42 kg and radius R = 1.31 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 315 N at the edge of the disk on the +x-axis, 2) a force 315 N at the edge of the disk

  49. An object is formed by attaching a uniform, thin rod with a mass of mr = 7.42 kg and length L = 4.88 m to a uniform sphere with mass ms = 37.1 kg and radius R = 1.22 m. Note ms = 5mr and L = 4R.

    3) What is the moment of inertia of the object about an axis

  50. What are three reasons lichens are useful to humans?


  51. A mass m = 88 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 15.5 m and finally a flat straight section at the same height as the center of the loop (15.5 m off the ground). Since the mass would not make it

  52. A block with mass m = 17 kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4201 N/m after being compressed a distance x1 = 0.556 m from the spring’s unstretched length. The floor is frictionless except for a rough

  53. The difference between two numbers is 4. The sum of the smaller number and three times the larger number is 36. What are the two numbers?

  54. A cannonball is shot (from ground level) with an initial horizontal velocity of 41 m/s and an initial vertical velocity of 22 m/s.

    1) What is the speed of the cannonball 1.7 seconds after it was shot? 2) How high above the ground is the cannonball 1.7

  55. Determine the x and y components of the following three vectors in the xy plane.

    1) (a) A 14-m displacement vector that makes an angle of 22° clockwise from the +y direction. x: 2) y: 3) (b) A 19-m/s velocity vector that makes an angle of 40°

  56. A blue ball is thrown upward with an initial speed of 21.0 m/s, from a height of 0.8 meters above the ground. 2.6 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.3 m/s from a height of 24.6 meters above the

  57. can someone help me for free to put the word abstract in a sentence?

  58. From "There will come soft rains",

    Although Bradbury’s story takes place in the future, what real war is Bradbury commenting on in his story? [Hint: the story was published in 1950] How was that war fought/won differently than WWI? What technological

  59. Juanita wants to gives bags of stickers to her friends.She wants to give the same number of stickers to each friend. She is not sure if she needs 4 bags or 6 bags of stickers .How many stickers could she buy so there are no stickers left over?

  60. In sexual reproduction, the variation among offspring, and the fact that they are genetically different from their parents, is due to which of the following?

    a) random alignment of homologues during meiosis 1 b) crossing over c) random process of

  61. A man is heterozygous for two genes (R and L) that are located on different chromosomes. Which of the following processes would result in different combinations of the alleles for these two genes in his sperm?

    a) fertilization b) independent assortment c)

  62. 40% of ___ = 60

  63. place brackets in the following statement to make it true

    20 - 6 x 2 + 1 = 2

  64. place brackets in the following statement to make it true


  65. Anna bought a strip of fabric 10 yd long. She needs a 1 and 1/3 yd piece to make a pillow. How many pillows can Anna make?

    10/1 * 3/4 = 7.5

  66. If the half life of Ir - 131 is 42 days, how much would be remaining after 168 days?

  67. In the merchant of venice act 3 scene 5,

    Antonio quips that the devil can cite scripture for his own purpose (I, iii, l.95). How does the scriptural debate between Launcelot and Jessica serve each character’s purpose? This debate has the potential to

  68. how many joules of heat are required to heat 149g of aluminum from 31.0 celcius to 75.5 celsius

  69. In the Merchant of Venice, What is Shylock’s initial reaction to Launcelot’s leaving his service? I googled it many times, but I couldn't find the answer!


  70. In the merchant of venice act 2 scene 4,

    What does Jessica’s letter say? What is her plan? Why would torchbearers be considered vile? Thanks!

  71. In the merchant of venice,

    Why do you think there is no Biblical imagery, only mythological imagery, in this scene? (act 2 scene 1) Thanks!

  72. In the merchant of venice act 2 scene 1:

    Look at the language he uses in ll.1-12 and 22-38. How does the imagery in his speech reflect the Elizabethan perception of Moors? What the heck does that mean? What is Moors?

  73. 25. Perform the following conversions. (Do your work on scratch paper and then type answer.)

    A. 105 m = cm B. 2000 mL = L C. 3400 g = kg D. 0.985 km = m E. 2345 mm = m F. 34 kg = g

  74. Given a square matrix M, we say that a nonzero vector v is an eigenvector of M if Mv=kv for some real number k. The real number k is called the eigenvalue of v with respect to M.

    1. Let v be an eigenvector of the matrix M with eigenvalue k. Find a simple

  75. Rhombus ABCD, with side length 6, is rolled to form a cylinder of volume 6 by taping side AB to side DC. What is sin(angle ABC)?

  76. Points A, B, and C are on the circumference of a circle with radius 2 such that angle BAC = 45 degrees and angle ACB = 60 degrees. Find the area of triangle ABC.

  77. what type of cell recognizes cells that have been infected by viruses because the infected cells have viral proteins on their surfaces?

  78. an inscribed angle with a diameter as a side has a measure of x degrees. if the ratio of measure of arc AD to measure of arc DB is 1:4, what is the measure of arc DB?

  79. A painter sets a ladder up to reach the bottom of a second-story window 16 feet above the ground. The base of the ladder is 12 feet from the house. While the painter mixes the paint, a neighbor's dog bumps the ladder, which moves the base 2 feet farther

  80. the product of y and six exceeds three times the sum of y and four

  81. Wat r 10 facts u didn't know about the Atlanta Campaign

  82. A prize of $100, $200, $500, or $1000 will be randomly awarded to a game show contestant, with the probabilities of winning each prize shown in the table below. What is the expected value of the prize that will be awarded?

  83. The cholesterol levels of adult American women has a mound-shaped and symmetric distribution

    with a mean of 188mg/dL and a standard deviation of 24 mg/dL. In what interval would you expect most American women’s cholesterol levels to be? Explain.

  84. Light from the Sun reaches Earth in 8.3 min. The speed of light is 3.00 x 10^8 m/s. How far is Earth from the Sun?

  85. Mr. Smith’s first period class had an average of 90% on the first test, and his 4th period class

    had an average of 82%. If there were 30 people in his first class, and 22 in his second, what is the average score of someone in his class?

  86. The young woman Lavinia Lyte sat at last and murmured to herself then to Johnny: "I must talk to toy, Jonathan Lyte tremain"

    Which of the following best explains why Johnny is so surprised by Lavinia Lyte's statement in this passage? a. Lavinia seems

  87. Which of the following passages from Johnny tremain is most useful in helping you determine what type of ruler general gage is? Select all that apply

    A. Sam Adams was so happy his hands shook worse then ever B. He was not brilliant but he was no tyrant C.

  88. gasoline sold in ontario must contain at least 5.00% v/v ethanol? How much gasoline contains 1.50 L of ethanol

  89. Johnny Tremain

    How does Rab's reaction to Johnny's hand compare to that of other people's? A like others, Rab is horrified B While others react with disgust or pity, Rab ignores the injury until Johnny mentions his band hand C Rab expresses great pity for

  90. Explain parts of the stem structure in the lilac flower or a flower similar to the lilac flower

  91. A piece of Cu wire is placed into 1.00L of a saturated solution of silver acetate, AgCH3COO. When all the Ag+ has reacted, 2.00g of Cu has been used.

    A) Write the net ionic equation for this reaction between Cu and Ag+. B) Calculate the Ksp of AgCH3COO.

  92. which of the following sentences from Johnny Tremain provides evidence that ran is having a positive effect on Johnny?

    A he liked to make handsome entrance. Even if he had Goblin had dawdled a bit on country roads, they both liked arriving at the inns at a

  93. Which point of view is are the sentences written?

    It was past dawn when he awoke, his feeling of contentment still in him. He was no longer his own problem but Merchant Lyte's. Tomorrow at this time what would he be calling him? Uncle Jonathan? Cousin Lyte?

  94. Your car is stuck in the mud. you have 2 pulleys, rope, and a sturdy tree. ignoring friction how much force can you apply to the car if you are able to pull on the rope with 150lbs of force?

  95. Consider the following equilibrium:

    2HI(g) *are in equilibrium with* H2(g) = I2(g) Keq = 81.0 A 2.00L container is initially filled with 4.00 mol HI. Calculate the [HI] at equilibrium. *I don't know how to put the equilibrium sign on the computer* Can

  96. A line directed to the west. A plane flies 20 degrees north of that direction ( 90 degrees north of that direction would be north..) if the plane flies for 340 km, determine its displacement toward the west and its displacement toward the north during its

  97. Increasing the surface area will increase the reaction rate in:

    1. N2(g) + O2(g) -> 2NO(g) 2. 2Mg(s) + O2(g) -> 2MgO(s) 3. CaCO3(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) + CO2(g) MY WORK: I think it is 2 & possibly 3. 1 is a homogeneous reaction but is 3 a

  98. Ruby emailed her instructor a question and he replied to her immediately.

  99. A rock tumbles straight down from a cliff, its moving at 20 m/s when it hits. What is the height of the cliff? The mass of the rock is 8 kg.

    a) 2.5 m b) 400 m C) 20.4 m d) 160 m

  100. A subcompact car, mass 1,000 kg, runs into and sticks to an at rest, 2,200 kg SUV. If their final speed is 4.7m/s ,what was the smaller cars initial speed?

    a) 67 m/s b) 30m/s c) 2.2 m/s d) 15 m/s


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