Popular questions and responses by Jen
  1. physics

    A 2500N pile-driver ram falls 10m and drives a post 0.1m into the ground. Find the average impact of force on the ram.

    asked on July 27, 2010
  2. math

    From a bag of peanuts, phillip took 1/3, then joy took 1/4 of the remaining, brent took 1/2 of the remaining, and preston took 10. There were 71 peanuts many were there to start?

    asked on July 6, 2013
  3. Exponents-word problem

    A culture starts at 8600 bacteria. After one hour the count is 10,000. Find a function that models the number of bacteria n(t) after t hours. The answer is n(t) = 8600e^.1506t Where does this 0.1506 come from? Thanks. n(t) = 8600 e^(kt), where k is an

    asked on February 16, 2007
  4. statistics

    Go to a local library; collect a sample of books consisting of the ages of book (based on copyright dates). Plan and describe the sampling procedure, then use the results to construct a confidence interval estimate of the mean age of all books in the

    asked on June 26, 2015
  5. Statistics

    One of the questions in the Pew Internet & American Life Project asked adults if they used the Internet, at least occasionally. The results showed that 454 out of 478 adults aged 18 - 29 answered yes; 741 out of 833 adults aged 30 – 49 answered yes; 1058

    asked on June 16, 2014
  6. Math

    A coin is biased so that a head is twice as likely to occur as a tail. If the coin is tossed 3 times, what is the probability of getting 2 tails and 1 head? What do you mean by biased in probability?

    asked on October 15, 2015
  7. Statistics

    A company manufactures calculators in batches of 64 and there is a 4% rate of defects. Find the probability of getting exactly three defects in a batch.

    asked on February 4, 2008
  8. Calculus

    The line that is normal to the curve x^2=2xy-3y^2=0 at(1,1) intersects the curve at what other point? Please help. Thanks in advance. We have x2=2xy - 3y2 = 0 Are there supposed to be 2 equal signs in this expression or is it x2 + 2xy - 3y2 = 0 ? I'll

    asked on October 15, 2006
  9. Algebra

    The arch of the bridge below is half an ellipse, a "semi-ellipse". The arch is 148m long and has a height of 48m at the center. The height of the arch is 10m at point p. What is the distance from p to the center?

    asked on January 25, 2017
  10. Math

    Given that x=log3^5 and y=log3^2, rewrite log3^60 in terms of x and y.

    asked on April 20, 2016
  11. chemistry

    What atomic or hybrid orbitals make up the sigma bond between As and F in hexafluoroarsenate ion, AsF6- ? orbital on AS:? orbital on F:?

    asked on September 30, 2009
  12. College Physics

    A fisherman notices that his boat is moving uo and down periodically, owing to waves on the surface of the water. It takes 2.5 s for the boat to travel from its highest point to its lowest, a total distance of 0.62 m. The fisherman sees that the wave

    asked on October 26, 2007
  13. physics

    You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball’s speed just at it leaves the ground after the bounce?

    asked on August 19, 2010
  14. stastics

    If 1.5% of the bolts made by an automotive factory are defective, what is the probability that in a shipment of 200 bolts, there are 6 defective bolts? Place your answer, rounded to four decimal places, in the blank.

    asked on July 8, 2012
  15. Civic

    One factor determining the number of representatives for a given congressional district is the distribution of _____ within the state A. registered voters B. population C. jobs D. wealth Answer is "B"

    asked on May 17, 2013
  16. statistics

    Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7.5 grams of fat per pound. A random sample of 34 farm-raised trout is selected. The mean fat

    asked on October 23, 2011
  17. Civics

    which of the following is not an authoritarian form of government? A. Totalitarianism B. Absolute monarchy C. Dictatorship D. Direct democracy Answer is "C"

    asked on May 11, 2013
  18. algebra

    Chris can be paid in one of two ways. Plan A is a salary of ​$380 per​ month, plus a commission of 9​% of sales. Plan B is a salary of ​$656 per​ month, plus a commission of 3​% of sales. For what amount of sales is Chris better off selecting

    asked on July 28, 2017
  19. chem 15

    The hardness of water (hardness count) is usually expressed as parts per million (by mass) of calcium carbonate. What is the molar concentration of calcium ions in a water sample with a hardness count of 175ppm?

    asked on November 8, 2016
  20. Statistics (Check Work)

    Can Someone help me with these 2 problems? I am certain I am solving them correctly, but for some reason the computer keeps marking my answers as incorrect. Question 1: Minnesota had the highest turnout rate of any state for the 2012 Presidential election.

    asked on June 26, 2014
  21. Civic

    The present-day Republican Party is descended from the ____ Party. A. Anti-Federalist B. Democratic Republican C. Federalist D. Conservative Answer is "D"

    asked on May 20, 2013
  22. Latin I

    “Arms and the man I sing”—With these words Virgil began his poem about the origins of the Rome. The “wars” were not only the famous Trojan War, but also the wars in Italy; “the hero” is Aeneas, who traveled from Troy to a new town, New Troy,

    asked on April 11, 2015
  23. chemistry

    Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose

    asked on September 23, 2008
  24. Eng

    Which statement is most accurate regarding the speaking-writing connection? A. To own a word, write it over and over again. B. Written words seldom reflect the words people use when they speak. C. To own a word, speak it. D. The words used by writers are

    asked on June 25, 2013
  25. chemistry

    use standard enthalpies of formation to calculate delta Hrxn for the following reaction. 2H2S(g)+3O2(g)-->2H2O(l)+2SO2(g) express the answer using four significant figures Delta Hrxn = ? kJ

    asked on October 25, 2011
  26. speaker vs. poet

    What the importance of knowing the difference between the speaker and the writer in a poem?

    asked on February 27, 2008
  27. Latin I

    1. Estne in Campania? a. where is Campania? b. he is in Campania, isn't he? c. he is not in Campania, is he? d. Is he in Campania? 2. Vesuviusne populum terruit? a. did vesuvius frighten the people? b. Vesuvius did not frighten the people, did it? c.

    asked on February 9, 2015
  28. math

    How many different sequences of 4 digits are possible if the first digit must be 3, 4, or 5 and if the sequence may not end in 000? Repetition of digits is allowed. A) 2000 B) 2997 C) 2999 D) 1512

    asked on November 18, 2009
  29. Joint variation

    A variable 'f' varies jointly as 'g' and the square of 'h' and inversely as 'j'. If f=-14 when g=5, h=8, j=20, what is 'f' when g=4, h=6 and j=9? Thanks. F=Constant*gh/j Use the data for determine the constant. Then, use the second set of data to determine

    asked on February 7, 2007
  30. AP Chemistry

    The formulas for ethanol and ammonium nitrate are C2H5OH and NH4NO3. In what respects are these formulas and compounds different? Am I supposed to say that there are different elements that make up the compounds?

    asked on September 5, 2011
  31. Algebra

    Suppose that the functions q and r are defined as follows: q(x)=2x+1 r(x)=-2x^2+1 Find the following: (qOr)(4)= (rOq)(4)=

    asked on January 28, 2011
  32. chemistry

    1. Which of the following statements about the cell theory is correct? a) All living organisms are made up of one or more cells. b) All cells arise from other, pre-existing cells c) All eukaryotic cells contain symbiotic prokaryotes. d) All prokaryotic

    asked on February 10, 2010
  33. statistics

    Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2 degrees F and a standard deviation of .62 degrees F. suppose we take a sample of eight healthy adults. what is the probability that their mean body temperature

    asked on December 6, 2011
  34. Math-CONFUSING!!

    Write the compound statement in symbols. Let r = The food is good, p = I eat too much, q = I'll exercise. If the food is good and I eat too much, then I'll exercise.

    asked on July 15, 2011
  35. Physics

    A 15.0 kg box is released on a 32 degree incline and accelerates down the incline at 0.30m/s sqaured ? find the friction force impeding its motion. What is the coefficient of kinectic friction?

    asked on February 15, 2011
  36. Trigonometry

    How do i find cos(2arctan(7/24)) Thanks.

    asked on November 12, 2008
  37. Math

    What is the rectangular equivalence to the parametric equations? x(θ)=4cosθ+2,y(θ)=2sinθ−5 , where 0≤θ

    asked on May 19, 2020
  38. Chemistry

    Each equation has to be balanced, please help 1. Erbium metal (Er) can be prepared by reacting erbium(III) fluoride with magnesium; the other product is magnesium fluoride. (a) What substance is reduced? (b) What is the reducing agent? (c) What substance

    asked on July 11, 2019
  39. Physics

    A box is sliding down an incline tilted at an angle of 2.14° above horizontal. The box is sliding down the incline at a speed of 5.15 m/s. The coefficient of kinetic friction between the box and the incline is 0.387. How far does the box slide down the

    asked on June 25, 2015
  40. algebra

    What is the discriminant of the polynomial below? 4x2 + 4x + 1 A. 0 B. -4 C. -12 D. 32

    asked on March 18, 2015
  41. math

    Using the numbers 2,3,5,10,24 write two separate equations that equal 120

    asked on May 6, 2014
  42. Physics

    An astronaut is inside a rocket that is blasting off vertically from the launch pad. You want this rocket to reach the speed of sound (331 m/s) as quickly as possible, but you also do not want the astronaut to black out. Medical tests have shown that

    asked on February 22, 2012
  43. Chemistry

    If the heat from burning 5.800 g of C6H6 is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542

    asked on February 10, 2012
  44. solving trig. equations

    tan(3x) + 1 = sec(3x) Thanks, pretend 3x equals x so tanx + 1 = secx we know the law that 1 + tanx = secx so tanx + 1 becomes secx and... secx = secx sec(3x) = sec(3x) [just put 3x back in for x- you don't really have to change 3x to x but it kinda makes

    asked on April 12, 2007
  45. chemistry

    why should excess alkali be avoided in the ferric chloride test for acetic acid and benzoic acid?

    asked on March 30, 2018
  46. chemistry

    the concentration of urea in a solution prepared by dissolving 16g of urea in 39 g of H2O is ________% by mass. The molar mass of urea is 60.0 g/mol

    asked on May 27, 2013
  47. Math

    Write the compound statement in symbols. Let r = The food is good, p = I eat too much, q = I'll exercise. If the food is good and I eat too much, then I'll exercise.

    asked on July 15, 2011
  48. Math

    Write a negation of the statement. Not all people like football.

    asked on July 12, 2011
  49. Physics

    A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.90 s. How high is the cliff?

    asked on October 23, 2010
  50. linear algebra

    what is the basis of a subspace or R3 defined by the equation 2x1+3x2+x3=0 I know the basis is vectors and but how do you get that?

    asked on May 16, 2010
  51. Navigation

    A fisherman leaves his home port and heads in the direction N 70 degree W. He travels 30 mi and reaches Egg Island. The next day he sails N 10 degree E for 50 mi, reaching Forrest Island. a) Find the distance between the fisherman's home port and Forrest

    asked on March 27, 2007
  52. Chemistry

    How many electrons in an atom could have these sets of quantum numbers? n=2 n=5, l=3 n=6, l=1, ml=-1

    asked on November 13, 2016
  53. Latin I

    Primo (at first), natura ab viris adorabatur. Antequam (afterwards), viri et feminae deos et deas laudabant. Tum (Then) animas naturae laudabant. Animae naturae timebantur. Viri rogabant: De quo luna (moon) venit (comes)? De quo sol (sun) venit (comes)?

    asked on February 10, 2015
  54. Statistics

    Can someone please help me answer these questions? I have tried every method I know and the computer still keeps marking the answers as incorrect. Thanks for the help! 1) If the number of 18-34 year olds sampled is equal to the value identified in part

    asked on June 10, 2014
  55. Math

    ABC Bank offers a savings account with 4.5% compounded quarterly. Find the APY the bank's savings account offers (round your answer to three decimal places).

    asked on January 9, 2013
  56. physics

    A model rocket leaves the ground, heading straight up at 47 m/s. (a) What is its maximum altitude? m What are its speed and altitude at each of the following times? (b) 1 s m/s m (c) 4 s m/s m (d) 8 s m/s m

    asked on January 16, 2011
  57. elementary math for teachers

    F25 = 75,025 and F26 = 121,393 where Fn is the nth term in the Fibonacci sequence. Find F27.

    asked on October 15, 2009
  58. Hinduism Essay-help

    I have to write an essay on Hinduism for my college class (Religions of the world. One question I'm having a difficult time answering is.. Explain the desire for liberation from earthly existence. Any ideas on what this means? My understanding is

    asked on June 14, 2009
  59. Calculus

    Find normals to the curve xy+2x-y=0 that are parallel to the line 2x+y=0 I have the answer: at(-1,-1), y=-2x-3, and at (3,-3), y=-2x+3 How do we get this? Thanks. xy + 2x - y=0 x dy/dx + y + 2 - dy/dx=0 dy/dx (x-1)= -y-2 dy/dx= - (y+2)/(x-1) The normal to

    asked on October 16, 2006
  60. Math -Trig

    Determine the exact value if cot(3pi/4) using special triangles. I don't understand how it could be 1/tan3pi/4 in a triangle....

    asked on May 3, 2016
  61. Physics

    An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of

    asked on April 28, 2016
  62. math

    : Use the formula from Part I to find the midpoint of the segment with endpoints at (-2, -1) and (0, 9). Show your work.

    asked on February 24, 2016
  63. History

    Hi I'm honestly stuck on these 3 questions, I looekd on wiki and everything. Please Please help me out.. What action did President Polk take that resulted in the war between the United States and Mexico? He ordered troops to invade Mexico and capture Vera

    asked on December 21, 2014
  64. math

    rachel drove 260 miles using 12 gallons of gas. at this rate, how many gallons of gas would she need to drive 286 miles?

    asked on May 26, 2014
  65. trig

    how do you find all the values of theta from 0 degrees through 360 degrees for which sin theta equals 0

    asked on August 18, 2011
  66. Math-probability

    One card is selected at random from a deck of cards. Determine the probability that the card is a black heart.

    asked on July 19, 2011
  67. physics

    an unstretched hanging spring is 50cm long. suspending a 100N weight from it makes its lenght 60cm. Adding another 100N weight will make the spring -- 60cm, 70 cm, 80 cm, 100 cm, or 120 cm. No idea how they came up with any of the five ??? My answer was

    asked on July 12, 2010
  68. chemistry

    In clinical lab reports, some concentrations are given in mg/dL. Convert a Ca2+ concentration of 3.5 mg/dL to weight/volume percent.

    asked on March 28, 2010
  69. physics

    consider three charges: +Q, -Q, q where the center charge is equidistnat from the other two. assum that the two Qs cannot move. you also want to charge q to be at rest. if q=-8.0 nC, find Q+ You don't have to solve it but can you lead me in the right

    asked on January 15, 2009
  70. math

    Carl drove from his house to work at an average speed of 35 miles per hour. The drive took him 25 minutes. If the drive home took him 30 minutes and he used the same route in reverse, what was his average speed going home?

    asked on December 31, 2008
  71. General Science

    When I2 dissolves in methanol, CH3OH, what type of forces exist between I2 and CH3OH molecules in solution?

    asked on February 19, 2008
  72. More Physics

    A light plank rests on two scales that read Fg1 = 410 N and Fg2 = 310 N. The scales are separated by a distance of 2.00 m. How far from the woman's feet is her center of gravity (the woman is laying on a plank with scales on both ends supporting the woman

    asked on December 3, 2006
  73. physics

    A strong lightning bolt transfers about 27 C to Earth. How many electrons are transferred? The elementary charge is 1.60218 × 10−19 C.

    asked on April 18, 2020
  74. Neutons Thrid law

    3. A force of 36 N gives a mass m1 an acceleration of 4.0 m/s2. The same force gives a mass m2 an acceleration of 12 m/s2. What acceleration will this force give to m1 and m2 if the two masses are fastened together? {3.0 m/s2}

    asked on April 8, 2016
  75. algebra

    w(3w-1)=200 solve for w

    asked on November 16, 2014
  76. Math

    A truck with 36-in.-diameter wheels is traveling at 55 mi/h. Find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes How many revolutions per minute do the wheels make? • This question is 2 parts. I can't

    asked on September 2, 2014
  77. Calc

    An Olympic-sized swimming pool is a rectangular prism that is 50m long, 25m wide, lled with water to a depth of 1.5m. We are going to pump the water out of the pool with a pump that is 0.5 meters above the surface of the water. Compare the costs of

    asked on May 18, 2014
  78. chem

    the balance equation for the reaction of aqueous sulfuric acid with aqueous ammonia is 2NH3(aq)+ H2SO4(aq) -> (NH4)2SO4(aq) 1. what volume of 0.250M sulfuric acid solution would be needed to react completely with 18.00mL of 0.350M ammonia solution? 2. what

    asked on April 15, 2014
  79. Algebra

    Remove the parentheses from the following expression, and combine like terms: (a + b – c) + 3a – 2c A. 2a – b + c B. 4a + b + 3c C. 4a + b – 3c D. 2a – b – c

    asked on November 15, 2013
  80. Chemistry

    ou are given the following data. S(s) + 3/2 O2(g) → SO3(g) ΔH = -395.2 kJ 2 SO2(g) + O2(g) → 2 SO3(g) ΔH = -198.2 kJ Calculate ΔH for the reaction below. S(s) + O2(g) → SO2(g)

    asked on March 13, 2013

    You mix 40.0 g of ethanol (C2H5OH, molecular weight = 46.1 g/mol) and 60.0 g of water (molecular weight = 18.0 g/mol) The resulting solution has a density of 920 g/L. a)Calculate the molarity of ethanol in this solution? Answer : 0.06 kg of H2O This is

    asked on March 18, 2012
  82. Math

    For the limit lim x → 3 (x3 − 2x + 5) = 26 illustrate the definition by finding the largest possible values of δ that correspond to ε = 0.2 and ε = 0.1. (Round your answers to four decimal places.)

    asked on September 19, 2011
  83. AP chem

    A 1.25-g sample contains some of the very reactive compound Al(C6H5)3. On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained. Al(C6H5)3(s) + 3HCl(aq) --> AlCl3(aq) + 3C6H6(l) Assuming that Al(C6H5)3 was converted completely to products,

    asked on September 6, 2011
  84. Math

    A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted? Oh goodness, I'm not sure what number to start with :(

    asked on July 23, 2011
  85. College Math

    Determine whether the pairs of sets are equal, equivalent, both, or neither. A = {7, 9, 10}, B = {a, b, c}

    asked on July 5, 2011
  86. math

    A 6-sided die is rolled. The sides contain the numbers 1, 2, 3, 4, 5, 6. List the sample space of rolling one die. 9) _______ A) {6} B) {36} C) {1, 2, 3, 4, 5, 6} D) None of these

    asked on December 6, 2009
  87. Algebra

    Solve the formula for the given variable. Assume all variables represent nonnegative numbers. A=6s^2, for s A. A/6 B. SQRT A/6 C. -SQRT A/6 D. Not given I believe the anser is B, but not 100% sure

    asked on November 22, 2009
  88. geography

    why is Washington DC. included in the southeast region?

    asked on January 19, 2009
  89. Chemistry

    Question 1. A Compound Containing 3 Atoms Of Carbon & 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The 2 End Products Of This Equation Are Carbon Dioxide &water. What Element Should You Look At 1st In Balancing This Equation? Choose

    asked on September 23, 2008
  90. physics

    Two point charges are placed on the x axis as follows: Charge q1= +4.00 nC is located at x= 0.200 m, and charge q2= +5.00nC is at x= -0.300 m. What are the magnitude and direction of the net force exerted by these two charges on a negative point charge q3=

    asked on January 21, 2008
  91. Poetry

    What is the tone of the poem "Litany" by Billy Collins? Is there some sort of message or is he just being weird? Since the first two lines were written by that Belgian guy, I would imagine he is making fun of love poems. Am I in the right direction?

    asked on December 18, 2007
  92. calculus

    If y is a differentiable function of x, then the slope of the tangent to the curve xy - 2y + 4y^2 = 6 at the point where y=1 is ...... How do I do this? Thanks. xy - 2y + 4y^2 = 6 ---> d[xy - 2y + 4y^2] = 0 ---> xdy + ydx - 2dy + 8ydy = 0 ---> (x + 8y -

    asked on December 3, 2006
  93. Social studies

    5. What effect on the Columbian exchange does this image illustrate? (A). The population boom of domesticated animals that escaped into the wild. (B). The conversion of the physical environment.*** (C). The introduction of milk cows to the North Americans

    asked on September 13, 2017
  94. Math

    the length of a wall in a floor plan is 6 1/2 inches.the actual wall is 78 feet long. find the scale of the floor plan The height of a building is 3 3/8 inches on a scale drawing. Find the actual height of the building if the scale used is 1inch:4feet.

    asked on January 25, 2016
  95. statistics

    A simple random sample size of n = 150 is obtained from a population whose size is N = 20,000 and whose population proportion with a specified characteristic is p = 0.6. What is the probability of obtaining x = 96 or more individuals with the

    asked on March 30, 2013
  96. chemistry

    How would you prepare a supersaturated solution of CuSo4 in 100ml of water

    asked on November 24, 2012
  97. Physics

    A certain freely falling object requires 1.50 seconds to travel the las 30.0 meters before it hits th ground. From what height above the ground did it fall?

    asked on September 22, 2012
  98. Chemistry

    This question was posted: At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the compound at 22 °C? I have found my [OH-] concentration

    asked on July 8, 2012
  99. Chemistry

    Hydrogen sulfide is an impurity in natural gas that must be removed. One common removal method is called the Claus process, which relies on the reaction: 8 H2S(g) + 4 O2(g)--> S(l) + 8 H2O(g) Under optimal conditions the Claus process gives 98% yield of S8

    asked on October 31, 2011

    1) The specific heat of solid copper is 0.385 J/g(C). What thermal energy change occurs when the temperature of a 34.10 g sample of copper is cooled from 35.7 degrees Celsius to 13.9 degrees Celsius? Answer: -286.3 J This amount of heat is used to melt

    asked on October 17, 2011


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