Most popular questions and responses by sean
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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

    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
  10. 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
  11. 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
  12. 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
  13. Algebra 1

    Seiji and Gavin both worked hard over the summer. Together, they earned a total of $425. Gavin earned $25 more than Seiji. Hoe 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 figure

    asked on January 23, 2015
  14. 8 Grd L.A.

    "When before in human history has so humanity collectively surrendered so much of its leisure to one toy, one mass diversion?" How would you answer the rhetorical question? ____________________________________________________________________________ I'm

    asked on December 7, 2016

    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
  16. 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
  17. 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
  18. 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
  19. Physics

    A uniform solid sphere rolls down an incline without slipping. If the linear acceleration of the center of mass of the sphere is 0.21g, then what is the angle the incline makes with the horizontal?

    asked on March 16, 2012
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. Grade 8 Lang Arts

    The story is "Trouble With Television" It has become fashionable to think that, like fast food, fast ideas are the way to get to a fast-moving, impatient public. How does the repetition in the sentence convey the author's negative attitude toward

    asked on December 7, 2016
  26. 8 Grd L.A.

    How does the repetition in the preceding sentence convey the author's negative attitude toward television? I think it shows how the author thinks negatively about television.

    asked on December 7, 2016
  27. 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
  28. Algebra

    A tourist traveled on a motorboat against the current for 25 km. And then returned back on a raft. In the boat the tourist traveled for 10 hours less than on the raft. Find the speed of the current if the speed of the motorboat in still water is 12

    asked on March 25, 2016
  29. 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
  30. Chemistry

    What happens when magnesium is added to Maleic and Fumaric acid? What gas is released from this reaction? I was also wondering if their are any differences between how each acid reacts with the magnesium because one is cis and the other trans. What happens

    asked on October 3, 2010
  31. 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
  32. 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
  33. 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
  34. math 5th

    The new playground at Middledale school will be enclosed by a fence. The playground will be rectangular and will have an area of 225 sq. yd. The number of yards on each side will be a whole number. What is the least amount of fencing that could be required

    asked on February 12, 2013
  35. Chemistry

    How many grams of pure uranium can theoretically be extracted from a 10.0 kg sample of pitchblende, which is 92.0% UO2? Im not looking for the answer. I would just like to know the formula to solve the problem.

    asked on April 9, 2016
  36. 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
  37. physics (elastic collision)

    A ball of mass .44 kg and speed of 4.5 m/s collides head-on with a .22 kg ball at rest. Assuming perfect elasticity, what is the speed and direction of each ball afterwards? I know that the momentum is conserved here and since I am solving fo two

    asked on February 1, 2007
  38. 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
  39. History

    What questions should I ask Andrew Jackson if I were to interview him about his presidency?

    asked on October 30, 2008
  40. 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
  41. 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
  42. Chemistry

    A Partially weather balloon has a volume of 195 L at a pressure of 0.993 atm. What will be the pressure in the balloon when it is inflated to a volume of 7500 L? (assume to temp. change)

    asked on April 8, 2016
  43. 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
  44. 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
  45. 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
  46. physics

    an operating 100-watt lamp is connected to a 120-volt outlet. what is the total energy used by the lamp in 60. seconds

    asked on January 27, 2016
  47. 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
  48. Chemistry

    When 22.7mL of o.500 M H2SO4 is added to 22.7mL of 1.00 M KOH in a coffee-cup calorimeter at 23.50 degrees Celsius, the temperature rises to 30.17 degrees Celsius. Calculate the delta h of this reaction. (Assume that the total volume is the sum of

    asked on October 19, 2012
  49. Chem

    A buffer contains 1.0mol CH3CO2H and 1.0mol CH3CO2^- diluted with water to 1.0L. How many moles of NaOH are required to increase the pH of the buffer to 5.10? (pKa oof Ch3CO2H=4.74)

    asked on March 25, 2010
  50. chemistry

    The molar heat of fusion for water is 6.01 kJ/mol. How much energy must be added to a 75.0-g block of ice at 0°C to change it to 75.0 g of liquid water at 0°C? 1.44 kJ 10.18 kJ 12.48 kJ 25.04 kJ

    asked on August 21, 2013
  51. Math

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

    asked on March 18, 2009
  52. 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
  53. 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
  54. Physics

    The hare and the tortoise are at the starting line together. When the gun goes off, the hare moves off at a constant speed of 10 meters per second. (Ignore the acceleration required to get the animal to this speed.) The tortoise starts from a dead stop,

    asked on October 2, 2014
  55. 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
  56. Physics

    What would be the appearance of the speed-time curve if the fallng body where so light that the effect of air friction could not be neglected?

    asked on January 9, 2011
  57. 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
  58. Calc-Based Physics

    The distance between two telephone poles is 50.0 m. When a 1.00-kg bird lands on the telephone wire midway between the poles, the wire sags 0.200 m. Draw a free-body diagram of the bird. How much tension does the bird produce in the wire? Ignore the weight

    asked on October 26, 2007
  59. 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
  60. Chemistry

    Is the boiling point of 0.01 m potassium fluoride solution higher or lower than that of 0.01 m glucose solution? Explain

    asked on December 8, 2014
  61. 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
  62. 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
  63. Physics

    ‎1. A 3kg body moving towards the east with a speed of 5 m/s collides with a 2kg ball originally at rest. After the collision the 3kg body moves in a direction of 25 degrees N of E. If the collision is perfectly elastic Find: a) the magnitude and

    asked on February 21, 2011
  64. 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
  65. 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
  66. 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
  67. math

    The ratio of Jim,s money to Peter,s money was 4:7 at first. After Jim spent 1/2 his money and Peter spent $60, Peter had twice as much money as Jim. How much money did Jim have at first?

    asked on February 28, 2019
  68. Calculus

    A tennis ball is dropped from a height of 32 feet, rebounding to 1/2 its former height with each bounce. How far will the ball have traveled VERTICALLY when it comes to a rest?

    asked on November 16, 2015
  69. biology/poetry

    can someone write me a acrostic poem on the word PHOTOSYNTHESIS, thank you

    asked on November 3, 2010
  70. physics

    A -kg block is initially at rest on a frictionless horizontal surface. It is pulled with a constant horizontal force N. How long must it be pulled before its speed is m/s? t_{pull} =

    asked on February 21, 2014
  71. Chemistry

    Which of the following is a Lewis acid? (For polyatomic species, consider the Lewis acid behaviour of the central atom). a. ) NH3 b. ) F- c. ) H2O d. ) PF5 e. ) BF3

    asked on May 30, 2009
  72. 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
  73. 5th grade Language

    Please help him if you can. REPETITION- occurs when a line or a sequence of lines appears more than once. ASSONANCE-is the repetition of the same or similar vowel sounds in a series of words, usually words with different consonant sounds. Read the poem,

    asked on November 5, 2009
  74. 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
  75. chemistry

    A 23.4 mL sample of 0.300 M trimethylamine, (CH3)3N, is titrated with 0.399 M perchloric acid. After adding 6.67 mL of perchloric acid, the pH is

    asked on April 1, 2013
  76. physics

    A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +20.5 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +12.0 revolutions. (a) How much time does it take for the bike to

    asked on November 10, 2010
  77. Math

    Marge said that she subtracted 20 from both sides of an equation to solve it. Kollin thinks that the equation she was solving could have been 6+t=20. Does Kollin's reasoning make sense? Explain.

    asked on February 6, 2018
  78. Physics

    A car of mass 1300 kg is driving along a road at speed of 28m/s. As it approaches some traffic lights, the lights change to red and the driver applies his brakes causing the car to skid. The frictional force between the skidding tyres and the road is 0.8

    asked on October 25, 2015
  79. Science

    Why does a balloon burst if you keep on blowing?

    asked on January 6, 2011
  80. 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
  81. Statistics

    A raffle is being conducted with 50 tickets to be sold - one per customer. There are three prizes to be awarded. If the four organizers of the raffle each buy one ticket, what is the probability that the four organizers win: a) all of the prizes? b)

    asked on July 3, 2009
  82. 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
  83. Physics

    A train is moving parallel and adjacent to a highway with a constant speed of 22 m/s. Ini- tially a car is 35 m behind the train, traveling in the same direction as the train at 36 m/s and accelerating at 4 m/s2. What is the speed of the car just as it

    asked on October 2, 2014
  84. physics

    Water is in the big beaker in the figure on the left. Scale 1 reads 87 Newtons, scale 2 reads 544 newtons, and scale 3 reads 0 newtons. The hanging block has a density of 15 x 10^3 kg/m^3. What does scale 1 read after the block is fully lowered into the

    asked on April 7, 2014
  85. 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
  86. physics

    Due to continental drift, the North American and European continents are drifting apart at an average speed of about 3 cm per year. At this speed, how long (in years) will it take for them to drift apart by another 658.1 m?

    asked on September 7, 2014
  87. math

    The manager of a tea shop mixes two types of teas to make a specialty blend. Alone, the teas sell for $3.99 and $8.99 per ounce. How many ounces of each type of tea should be used to make 32 ounces of a mixture that sells for $5.99 per ounce?

    asked on May 28, 2014

    ELECTROLYSIS OF ZnI2 if you have done this experiment Please help me answer these questions as i missed the last half of my chem lab today. 1. What color change occurred when the wire is first heated. -next question is... What is the identity of the

    asked on April 18, 2013
  89. physics

    Find the voltage increase when 12 J of work is done to push a 0.0013 C charge into an electric field.

    asked on March 24, 2010
  90. Math

    Mike is a building a model of an antique car. The scale is 2cm=3ft. If the windshield of the car is 6ft wide, what is the width of the windshield on the model?

    asked on April 8, 2019
  91. 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
  92. language arts

    what is the most impressive example of anne's inner strength in act 2?

    asked on March 12, 2016
  93. physics

    A cannon fires a 0.598 kg shell with initial velocity 10 m/s in the direction 46◦ above the horizontal. The shell’s trajectory curves downward be- cause of gravity, so at the time t = 0.53 s the shell is below the straight line by some verti- cal

    asked on November 7, 2014
  94. Chemistry

    The speed of light in a vacuum is 2.998 x 10^8 m/s. What is the speed of light in miles per hour? (1 km = 06214 miles)

    asked on October 14, 2014
  95. 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
  96. Physics

    A 1500-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 13.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision? 1. Degree north of east? 2. M/S?

    asked on February 3, 2014
  97. 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
  98. Trigonometry

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

    asked on May 30, 2011
  99. Chemistry

    A 20.0-mL sample of 0.20M sodium acetate is titrated with 0.11M HCl(aq). What is the pH after the addition of 50.0-mL HCl(aq)? (Kb of CH3CO2 = 5.6x10^-10)

    asked on March 26, 2010
  100. Precalc

    What happens if you try to find the zeros using the quadratic formula for k(x)=x^2 -2x+2?

    asked on January 30, 2019


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