Popular questions and responses by Sean
  1. English

    Which of the following sentences demonstrates proper subject verb agreement? A. The boy or the girls come to school late B. The boys and girl visits my house C. The boys or the girls sing in the choir D. The boys and girl in our club is in the cafe.

    asked on February 24, 2018
  2. statistics

    Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal,

    asked on November 16, 2014
  3. Physics

    A sphere of radius 10 cm is charged to a potential of 500V. Calculate the outward pull per unit area. Ans: 1390 * 10^-8 N/m^2 -------- I'm sure the calc is simple, but how do I calculate "outward pull" from voltage?

    asked on December 24, 2009
  4. physics

    Two people pull as hard as they can on ropes attached to a 200 kg boat. If they pull in the same direction, the boat has an acceleration of 1.44 m/s2 to the right. If they pull in opposite directions, the boat has an acceleration of 0.518 m/s2 to the left.

    asked on September 25, 2012
  5. AP English

    Refer to the excerpt from "A Bachelor's Complaint of the Behaviour of Married People." The phrase"as a sovereign Prince" in the third sentence of paragraph two is an example of which rhetorical device? a. an appeal to logic b. simile c. an appeal to

    asked on April 16, 2018
  6. AP English

    Refer to the excerpt from "A Bachelor's Complaint of the Behavior of Married People". You can infer from the fifth sentence that "them" refers to a. wives b. husbands c. old friends d. sovereign princes e. friendships Fifth Sentence is: "With some

    asked on April 16, 2018
  7. economics

    1) Give an example that you believe demonstrates when the cost of government actions outweighs the benefits.Identify the factors that may cause the costs of government actions to outweigh the benefits. I'm confused what does that mean? Thank you for your

    asked on July 23, 2014
  8. Physics

    a lunar landing module is descending to the moon's surface at a steady velocity of 10 m/s. At a height of 120m, a small object falls from its landing gear. Taking the moon's gravitational acceleration as 1.6m/s^2, at what speed, in m/s, does the object

    asked on November 16, 2006
  9. History

    How did Maryland's political status during the Civil War reflect that of other border states? President Lincoln suspended habeas corpus to keep Maryland in the union. Maryland was a slave state that remained part of the union. Most of the battles of the

    asked on May 6, 2019
  10. Reading

    Which of the following can be used to find journal articles on a given topic? a. A handbook b. A style guide c. A periodical index d. An encyclopedia I think the correct answer is B style guide

    asked on February 24, 2018
  11. Statistics (Poisson)

    Cars arrive at a toll booth according to a Poisson process with mean 80 cars per hour. How long can the attendant's phone call last if the probability is at least .4 that no cars arrive during the call. The book's answer is 23 seconds. That doesn't match

    asked on July 19, 2009
  12. math

    All the members of a construction crew work at the same pace. Six of them working together are able to pour foundation in 22 hours. How many hours would this job take if the number of workers: if the workers increased by the factor two

    asked on October 20, 2017
  13. Physics

    A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 353 K. If 25.0 J of work is done by the gas during this process, what is the mass of helium present?

    asked on May 13, 2011
  14. Chemistry

    what volume of .422 M NaOH must be added to .500L of .300 M acetic acid to raise its ph to 4.00 i know you have to use the henderson hasselbalch equation but im not sure which values i would use for the concentration portion of the equation. would i have

    asked on March 4, 2017
  15. Chemistry

    which salt solution would have the highest ph and why KI,KBr,KF,KCL or they all have the same ph. Im leaning towards KF since im pretty sure the other salts are neutral?

    asked on February 19, 2017
  16. Chemistry

    Determine the value of the equilibrium constant,Kgoal , for the reaction N2(g)+O2(g)+H2(g) (1/2)N2H4(g) + NO2(g) Kgoal=? by making use of the following information: 1.N2(g)+O2(g)2NO(g), K1=4.1010x10^-31 2.N2(g)+2H2(g)N2H4(g), K2=7.40x10^-26

    asked on March 31, 2013
  17. Math 102

    A bag contains six marbles, of which four are red and two are blue. Suppose two marbles are chosen at random and X represents the number of red marbles in the sample. Looking for the expected value of X.

    asked on March 21, 2011
  18. Math

    Where does this infinite series converge: Sigma (k = 1 to infinity): 1/(9k^2 + 3k - 2)

    asked on March 18, 2009
  19. trig question...

    During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the

    asked on July 12, 2011
  20. Algebra

    Select Yes or No to state whether each data set is likely to be normally distributed. Please help! the number of coupons used at a supermarket. --> I believe YES. the weights of the pumpkins that are delivered to a supermarket. --> I believe NO. the number

    asked on May 30, 2018
  21. Algebra 1

    Seiji and Gavin both worked hard over the summer. Together, they earned a total of $425. Gavin earned $25 more than Seiji. !@#$%^& much did each of them earn? A. Write a system of two equations to model this program. I got 1 equation down, i just cant

    asked on January 23, 2015
  22. Physics

    A mass of 0.55 kg attached to a vertical spring stretches the spring 36 cm from its original equilibrium position. The acceleration of gravity is 9.81 m/s2 . What is the spring constant? Answer in units of N/m.

    asked on January 12, 2015
  23. Science

    Why does a balloon burst if you keep on blowing?

    asked on January 6, 2011

    Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base? I need help on this question. Please explain this to me!

    asked on March 14, 2010
  25. Physics

    A basketball is thrown horizontally with an initial speed of 4.20 m/s. A straight line drawn from the point to the landing point makes an angle of 30.0 with the horizontal. what was the release height?

    asked on March 13, 2008
  26. Precalc

    Find the exact solutions to each equation for the interval [0,360) 2cosx-secx = 1

    asked on December 6, 2007
  27. math

    The region between the graphs of x=y^2 and x=5y is rotated around the line y=5. What is the volume?

    asked on May 3, 2019
  28. Algebra

    If a certain number is added to the numerator and denominator of 11/13, the result is 11/12. Find the number.

    asked on November 4, 2015
  29. algebra

    A square plot of land has a building 60ft long and 40ft wide at one corner. The rest of the land outside the building forms a parking lot. If the parking lot has area 12,000ft^2, what are the dimensions of the entire plot of land? The answer is 120ft by

    asked on September 2, 2009
  30. physics

    A 1.0-kg cart and a 0.50-kg cart sit at different positions on a low-friction track. You push on the 1.0-kg cart with a constant 2.5-N force for 0.15m . You then remove your hand, and the cart slides 0.35 m and strikes the 0.50-kg cart. By what amount does

    asked on October 23, 2014
  31. trig identities

    Find the exact value of cos (2theta) given csc theta = 8/3 and 0 < theta < pi/2

    asked on May 8, 2013
  32. Chemistry

    H2C2O4.2H2O(s) is primary standard substance. 2.3688g of oxalic acid hydrate were completely neutralized by 42.56ml of NaOH solution. Calculate the molar concentration of the NaOH solution. Write the balanced equation for the reaction.

    asked on April 1, 2013
  33. MATH

    a rectangular garden 9ft by 12 ft includes a uniform border of wood chips around a rectangular bed of flowers. If flowers take up half the garden's area. find the perimeter of the flower bed

    asked on February 16, 2013
  34. physics

    A pellet gun is fired straight downward from the edge of a cliff that is 17 m above the ground. The pellet strikes the ground with a speed of 29 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?

    asked on October 1, 2010
  35. biochem

    For an enzyme that follows simple Michaelis–Menten kinetics, what is the value of Vmax if V0 is equal to 1 mmol minute−1 when [S] = 1/10 KM I keep getting 11 for the answer but the answer key in my book says 1.1 umol. what am i doing wrong?

    asked on October 15, 2018
  36. Algebra

    A train covered the distance of 400 km between A and B at a certain speed. On the way back it covered 2/5 of the distance at that same speed and then it decreased its speed by 20 km/hour. Find the speed of the train at the end of its journey from B back to

    asked on March 25, 2016
  37. Physics

    A liter of water is used to cool some electronics. If 1000 J of heat is given off by the electronics, by what temperature does the water increase? One liter of water has a mass of 1 kg and a specific heat of 4.184 J/(g °C). I can not get this..please help

    asked on April 26, 2015
  38. Physics

    A cannon is fired at 30 degrees above the horizontal with a velocity of 200 m/s from the edge of a 125 m high cliff. Calculate where the cannonball lands on the level plain below.

    asked on January 18, 2015
  39. Physics

    2. A pool has an area A = 50 m2 and depth h = 2.5 m. The pool is filled with water to the maximum height. An electrical pump is used to empty the pool. There are two pipes coming out the pump: one is submerged into water has a radius r1 = 4 cm the other

    asked on April 13, 2012
  40. Geography

    What is the difference between a physical map and a political map?

    asked on September 19, 2011
  41. Physics

    A cord passes over a weightless and frictionless pulley. Masses of 200 g and 300 g are attached to the ends of the cord. Find the distance the masses will move during the 5th second after they are started from rest.

    asked on January 30, 2011
  42. Physics

    A negative charge -Q is placed inside the cavity of a hollow metal solid. The outside of the solid is grounded. Q: Is there any excess charge induced on the inner surface of the piece of metal? A: Yes, +Q Q: Is there any excess charge on the outer surface

    asked on December 25, 2009
  43. Calculus III

    Derivative of Inverse Trigonometric Functions f(x) = sin(arccos(4x)) What is f'(x)?

    asked on January 22, 2008
  44. Algebra

    A class of 33 33 students elected a class treasurer. There were 11 11 votes for Candidate A and 15 15 votes for Candidate B. The remaining students did not vote. Which expression gives the percent of voters who voted for Candidate A?

    asked on October 9, 2019
  45. History

    Which of these actions did President Lincoln take at the beginning of the Civil War? He declared martial law throughout the nation. He imprisoned congressional representatives from the South. He issued a declaration of war without the consent of Congress.

    asked on May 6, 2019
  46. math

    You have been assigned to interface different sensors (displacement, vibration, pressure, temperature) to the ADuC847. More specifically, you have been assigned to design the antialiasing filters for the different analog input channels on the ADuC847

    asked on December 7, 2018
  47. Math

    An aquarium tank holds 475 liters of water. How much is this in gallons? Use the following conversion: 1 gallon is 3.8 liters.

    asked on October 21, 2018
  48. AP English

    Refer to the passage from Benedict de Spinoza's On the Improvement of the Understanding, translated by R.H.M. Elwes. The last sentence in the passage is: 1. A summary of a main idea in the passage 2. An example that illustrates a hypothesis 3. A transition

    asked on May 22, 2018
  49. math

    The area of a triangle is 600 square feet. Find the altitude, in feet, of the triangle if the length of the corresponding base is 30 feet.

    asked on March 26, 2015
  50. algebra

    The ratio of the lengths of strings that play the notes D and B (on a guitar), is 27 to 16. If a string 64 cm long plays B, what is the length of the string that plays a D?

    asked on June 12, 2014
  51. Chemistry

    What effect on the molar mass of the unknown acid would each of the following have-that is-would it make the calculated molar mass high, low, or would it have no effect? 1. Adding 5 drops of phenolphthalein instead of 1 drop. 2. Using a standard NaOH

    asked on April 3, 2013
  52. Trigonometry

    verify the identity: 1- (cos^2x)/(1-sinx)= -sinx

    asked on May 30, 2011
  53. physics

    A student (m = 68 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the

    asked on November 10, 2010

    Which of the fallowing compounds may be Arrhenius acids: CH4, SO2, H2S, Ca3(PO4)2 Can you please explain how you got the answer because I don't understand how you can tell.

    asked on March 14, 2010
  55. Calclulus - L'Hopital's Rule

    Evaluate the limit as x -> Infinity [5x-sqrt(25x^2+4x)] Direct substitution yields the indeterminate form Infinity - Infinity. Apparently, according to text book, I have to change that mess into something I can use L'Hopital's Rule on. Except the only

    asked on March 16, 2008
  56. History

    To determine how many Electoral College votes a state has, which of the following would you need to know? a. The number of Democratic and Republican voters in that state b. The state's population and the number of registered voters in that state c. The

    asked on May 7, 2020
  57. Math (Urgent!)

    Consider 10 independent tosses of a biased coin with the probability of Heads at each toss equal to p , where 0

    asked on October 2, 2018
  58. AP English

    The author uses the indefinite pronoun something in the first sentence because: a. he wants to hook the reader with the ambiguity b. he's imprecise in his thinking c. his style is academic and purposefully obscure d. he does not know yet what the

    asked on May 22, 2018
  59. AP English

    The fourth sentence in "A Bachelor's Complaint of the Behaviour of Married People" (I have scarce a married friend of my acquaintance, upon whose firm faith I can rely, whose friendship did not start after the period of his marriage.) is an example of: a.

    asked on April 16, 2018
  60. Chemistry

    Given the following reaction for photosynthesis, 6CO2 + 6H2O --> C6H12O6 + 6O2, how many liters of O2 can be produced from 100 g of water at standard temperature and pressure?

    asked on February 27, 2018
  61. Math

    In ∆ABC, the median AM (M ∈ BC) is perpendicular to the angle bisector BK (K ∈ AC).Find AB, if BC = 12 in.

    asked on October 14, 2017
  62. Language Art, please check!

    1. Tiny Tim’s father, Bob Cratchit, works for Scrooge. What is the appositive in this sentence? Tiny Tim father Bob Cratchit *** Scrooge 2. The Ghost of Christmas Future, the third spirit, takes Scrooge to see his grave. What is the appositive phrase in

    asked on April 22, 2016
  63. chemistry

    He has narrowed the identity of his unknown to either molecule X, molecule Y, or molecule Z. The Merck Index tells him that all three molecules produce white, needle-like crystals from ethanol. How might he definitively identify his unknown molecule?

    asked on February 2, 2016
  64. Mathematics

    Given that 2cos^2 x - 3sin x -3 = 0, show that 2sin^2 x + 3sin x +1 = 0? Hence solve 2cos^2 x + 4sin x - 3 = 0, giving all solutions in the interval 0 ≤ x ≤ 2π

    asked on November 18, 2015
  65. College Algebra

    The function w(x) = -0.01x² + 0.27x + 8.60 can be used to estimate the number of self-employed workers in America in millions, x years after 1980. For what years were there (or will be there) 9.7 million self-employed worker in America?

    asked on April 23, 2015
  66. Physics

    Converging lens has focal lenght 8 cm , at what distance you will have to place the object in the following devices; 1) Collimator of Spectrum 2) Terrestrial Telescope

    asked on January 14, 2015
  67. science-chemistry

    An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over

    asked on October 20, 2014
  68. Chemistry

    An aqueous solution of ammonium nitrite decomposes when heated to give off nitrogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was collected

    asked on October 20, 2014
  69. Physics

    A physics book slides off a horizontal table top with a speed of 1.30 m/s . It strikes the floor after a time of 0.380s . Ignore air resistance. Find the height of the table top above the floor. Find the horizontal distance from the edge of the table to

    asked on February 16, 2014
  70. chemistry

    A sample of naphthalene (C10H8) that has a mass of 0.7200 g is burned in a bomb calorimeter. The mass of the calorimeter is 1.580 kg, and its specific heat is 2.55 J/(g °C). As a result of the reaction, the temperature of the calorimeter increases from

    asked on August 22, 2013
  71. Thermochemistry

    My question is more conceptual. It is expressed in a series of two problems: What energy change occurs when 1.2 moles of methane combust with an enthalpppy change of -434 KJ? CH4+2O2 TO CO2+2H20 I understand it is simply the moles of mthane times the

    asked on March 19, 2013
  72. chemistry 122

    81) According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? Assume excess SiO2. SiO2(s) + 4 HF(g) �� SiF4(g) + 2 H2O(l) DH°rxn = -184 kJ 81) A) 173 g B) 37.5 g C) 150. g D)

    asked on December 11, 2012
  73. algebra


    asked on November 8, 2012
  74. math

    in a class one quarter of students have blonde hair and brown eyes and one third have brown eyes and blonde hair what fraction of the class in total have brown eyes

    asked on September 19, 2012
  75. chemistry

    Four solution are prepared and mixed together: Start with 100.0ml of 0.100M BaCl2. Add 50.0ml of 0.100M AgNO3. Add 50.0ml of 0.100M H2So4. Add 250.0ml of 0.100M NH4. Write an equation for any reaction that occurs after each step and calculate the

    asked on May 2, 2012
  76. algebra

    This is a project called guess your card. there are 3 people playing and you. We are drawing only numbers from 1 to 9. Each person draws 3 cards and puts them on their foreheads facing out. 1 has a 1,3,7 next person has 3,4,7 and 3rd person has 4,6,8. What

    asked on December 4, 2011
  77. matlab

    One bank pays 5.5 percent annual interest, while a second bank pays 4.5 percent annual interest. Determine how much longer it will take to accumulate at least $50 000 in the second bank account if you deposit $1000 initially and $1000 at the end of each

    asked on October 29, 2011
  78. Geography

    What are the capitals of the two states that border both the Mississippi and Ohio Rivers?

    asked on September 27, 2011
  79. Anatomy

    Describe 4 lung volumes that are measured by a spirometer

    asked on June 1, 2011
  80. Science

    It would be awesome if you can help me with this :) Two station astronauts each need to perform three 8-hour EVAs during their 13-day mission to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. How much oxygen will

    asked on January 31, 2011
  81. alg

    what are the non-permissible value for the rational expression x^2 + x - 6 / x^2 + x -12? a) x = 3 and x = -4 b) x = 0 and x = -4 c) x = 0 and x = -2 d) x = 2 and x = -3

    asked on June 27, 2010
  82. Chemistry

    All of the following apply to the reaction A(g)+B(g)C(g) as it is carried out at constant temperature in a rigid container EXCEPT: A)The total pressure decreases B)The rate of reaction decreases C)The entropy of the system decreases D)The number of

    asked on May 4, 2010
  83. physics

    What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz

    asked on March 23, 2010
  84. Calculus

    For any constant c, define the function f_c(x)= x^3+2x^2+cx. (a) Graph y = f_c(x) for these values of the parameter c: c = -1, 0, 1, 2, 3, 4. What are the similarities and differences among the graphs, and how do the graphs change as the parameter

    asked on November 1, 2009
  85. Physics

    14. Which of the following wavelengths will produce standing waves on a string that is 3.5 m long? a. 1.75 m b. 3.5 m c. 5.0 m d. 7.0 m

    asked on October 28, 2009
  86. math problem

    how do I find all real solutions of this quadratic equation. w^2 = 3(w - 1)

    asked on August 31, 2009
  87. Biology

    Danielle was born with a birth defect which resulted in a lack of primary auditory cortex formation. Which of the following will likely result? a. Danielle will not be about to hear from her right ear. b. Danielle will not be able to hear at all. c.

    asked on February 3, 2009
  88. Physics

    On a hot summer day, a young girl swings on a rope above the local swimming hole. When she lets go of the rope her initial velocity is 2.25m/s at an angle of 35.0 above the horizontal. If she is in flight for 0.616sec, how high above the water was she when

    asked on March 13, 2008
  89. Calculus III

    Derivative of Inverse Trigonometric Functions f(x) = cos(arcsin(2x)) What is f'(x)?

    asked on January 22, 2008
  90. Geometry

    What would the radius and height be of a 3-dimensional cylinder that was formed by rotating a square, with 3 inch sides, around the y-axis?

    asked on April 10, 2020
  91. math

    Name a pair of numbers whose greatest common factor is the same as one of the numbers.

    asked on September 7, 2019
  92. Chemistry

    Calculate the change in pH when 9.00 mL of 0.100 M NaOH(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).

    asked on May 15, 2019
  93. Chemistry

    50.0 mL of 0.18 M NH3 with 5.0 mL of 0.36 M HBr. Kb of NH3 is 1.77 x 10-5 Calculate pH I don't know where to begin

    asked on May 6, 2019
  94. biology

    Does the affinity of myoglobin for oxygen change when oxygen concentration changes? Im not really sure how to answer this. I know that myoglobin has very strong affinity for oxygen so once myoglobin is in the presence of oxygen it will react right away

    asked on October 7, 2018
  95. chemistry

    What will be the amount of para-nitrophenol (PNP) in solution if 454.9 mL of 2.15 *10-2 M PNP solution is mixed with 92.7 mL of water? Report the amount in millimoles. Hint: do not confuse amount and concentration. I have not had chemistry in a long time

    asked on September 12, 2018
  96. AP English

    Plato, Symposium ’He who has been instructed thus far in the things of love, and who has learned to see the beautiful in due order and succession, when he comes toward the end will suddenly perceive a nature of wondrous beauty (and this, Socrates, is the

    asked on May 22, 2018
  97. AP English

    I AM back in Bracciano, a castellated town about 13 miles north of Rome, after a year in New Jersey. I find the Italian Government still unstable, gasoline more expensive than anywhere in the world, butchers and bank clerks and tobacconists (which also

    asked on April 16, 2018
  98. intermediate algebra

    inequalities –1 ≤ x – 3 ≤ 5 –2x – 5 < –2 or x – 3 < –10 Be careful of how a negative x-term is handled in the solving process. Show all math work arriving at the solutions. •Show the solution sets written algebraically and as a union or

    asked on March 15, 2017
  99. Chemistry

    Rxn 1: 4 NH3(g) + 5 O2(g) ⇌ 4 NO(g) + 6 H2O(g) If the equilibrium constant, Kc, for Rxn 1 is 0.0015, determine the equilibrium constant, Kc, for the reaction: 2 NH3(g) + 5/2 O2(g) ⇌ 2 NO(g) + 3 H2O(g) I'm not sure how to start this problem would it

    asked on January 25, 2017
  100. Chemistry

    Consider the reaction: 2H2+2NO->N2+2H2O. Initially 1.20mol of H2 and 0.95 mol of NO are placed in a container(all reactants and products are gases). If after 5 seconds the amount of H2 has been reduced to 1.02mol then how much NO is left and how much N2

    asked on April 26, 2016


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