Erica

Most popular questions and responses by Erica
  1. science

    which of the following is true about photosynthesis

    asked on October 6, 2016
  2. Calc

    The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 350 bacteria after 4 hours. a) Find the initial population. b) Write an exponential growth model for the

    asked on January 6, 2011
  3. Physics (Help!)

    You throw a glove straight upward to celebrate a victory. Its initial kinetic energy is K and it reaches a maximum height H. What is the kinetic energy of the glove when it is at the height H/2?

    asked on January 9, 2011
  4. Calc

    Let f be the function given by f(x) = tan x and let g be the function given by g(x) = x^2. At what value of x in the interval 0≤x≤π do the graphs of f and g have parallel tangent lines?

    asked on January 2, 2011
  5. Pre algebra

    Please help I’m struggling with how to find the percent of change each decade and how to predict a future price. I can’t find any examples of this lesson for help Directions: You probably see them in the news all the time—predictions about prices,

    asked on December 8, 2017
  6. Chemistry

    I need help please I am so confused. How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent? I know the MM of KCl is 74.55 107g of 0.535m KCl

    asked on September 18, 2012
  7. Math

    A rocket is launched from ground level with an initial vertical velocity (v0) of 176 ft/s. After how many seconds will the rocket hit the ground? (Hint: h(t) = -16t2 + v0t + h0)

    asked on November 26, 2012
  8. Physics

    A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 2.7 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving

    asked on January 20, 2010
  9. American Government

    Why do presidents prefer federal judges who tend to agree with their views?

    asked on January 4, 2017
  10. Physics

    A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon absorb from the coffee to reach a temp. of 89.0 degrees C? Rememeber this equation. It, or a slight modification of it, will work all

    asked on November 21, 2006
  11. stats

    A company with a large fleet of cars found that the emissions systems of 18 out of the 65 randomly selected cars they tested failed to meet pollution control guidelines. Is this strong evidence that more than 20% of the fleet might be out of compliance?

    asked on May 11, 2011
  12. Differential Equations

    The velocity v of a freefalling skydiver is well modeled by the differential equation m*dv/dt=mg-kv^2 where m is the mass of the skydiver, g is the gravitational constant, and k is the drag coefficient determined by the position of the driver during the

    asked on January 24, 2013
  13. physics

    How much heat is necessary to change 500g of ice at-10 celsius to water at 20 celsius?

    asked on October 15, 2012
  14. Calc

    Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!

    asked on April 25, 2011
  15. Physics 1

    The drawing shows three particles far away from any other objects and located on a straight line. Particle B is located in the middle of particles A and C. The distance between particles A and B is 0.500 m. The distance between particles B and C is 0.250

    asked on February 19, 2014
  16. Finance

    Determine the annual net cost of this checking account? Annual interest of 2.5% paid if balance exceeds $750, $8 monthly fee if account falls below minimum balance, average balance $815, account falls below $750 during 4 months. Is my answer correct? 815 *

    asked on August 8, 2013
  17. weber state university

    CH2=CH-CH2CH3+H2O What is the product of the reaction above

    asked on April 11, 2013
  18. chemistry

    A tank holds 52.9 cm3 of water. What is the volume in in3? (2.54 cm=1 in, Remember significant figures, but this answer does not need units, since the answer must be in in3)

    asked on September 14, 2015
  19. Pre-Calculus

    The formula D= 5e ^-0.4h can be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. When the number of milligrams reaches 2, the drug is to be administered again. WHat

    asked on October 10, 2006
  20. global history

    the wealth that enabled the Italian city-states to lead in the development of Renaissance arts was derived mainly from? a)the quantities of gold and silver brought back to Italian explorers b)concentration of riches in the hands of the king and his court

    asked on May 31, 2011
  21. Chemistry

    A mixture of gases at 760.0 torr contains 35.0% nitrogen, 22.0% oxygen , and 43.0% carbon dioxide by volume. What is the pressure of the carbon dioxide gas in torr?

    asked on August 19, 2011
  22. Science-Physics

    You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = .55. The force you exert is horizontal. (a) How much power is needed to push the box at a speed of .50 m/s? (b) How much work do you do if you push the box for 35 s?

    asked on January 9, 2011
  23. physics

    A sample of blood is placed in a centrifuge of radius 20.0 cm. The mass of a red blood cell is 3.0 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 10-11 N. At how many revolutions per second should the

    asked on October 18, 2010
  24. Physics

    A bag of sugar weighs 4.00 lb on Earth. What would it weigh in newtons on the Moon, where the free-fall acceleration is one-sixth that on Earth? 1 N Repeat for Jupiter, where g is 2.64 times that on Earth. 2 N Find the mass of the bag of sugar in kilograms

    asked on September 16, 2010
  25. Calc

    If f(x) = e^(sin x), how many zeros does f '(x) have on the closed interval [0, 2π]?

    asked on January 2, 2011
  26. chemistry

    at 327 degrees C, the equilibrium concentrations are [CH3OH]=0.15M, [CO]=0.24M, and [H2]=1.1M for the reaction: CH3OH(g)CO(g)+2H2(g) Calculate Kp at this temperature

    asked on February 16, 2011
  27. Psychology

    Classical Conditioning. 1)Terell feels ill every time he sees a Wendy's restaurant sign. Two weeks ago while on his lunch break, he went to Wendy's and ate a chicken sandwich. He was not aware that the chicken was spoiled. a. Name the Unconditioned

    asked on July 12, 2015
  28. Chem

    Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. a) How many atoms of oxygen are in 5.15g of Epsom salts? b) How many formula units of the compound are present in 5.15g? c) How many moles of water molecules are in 5.15 g of Epsom

    asked on October 7, 2011
  29. Calc

    A body of an unknown temperature was placed in a room that was held at 30°F. After 10 minutes, the body's temperature was 0°F, and 20 minutes after the body was placed in the room the body's temperature was 15°F. Estimate the body's initial temperature.

    asked on January 6, 2011
  30. math

    What is a generalization for this set of polygons: square, hexagon and a pentagon

    asked on February 1, 2010
  31. Math

    The population of humorville is 8,500 people. In this town, jokes travel fast. In one hour, each person who hears a joke tells three other people who have not heard it, and tells no one else. Last Friday, a visitor from out of town told the police chief a

    asked on March 19, 2012
  32. Calc

    How do you integrate sin²x?

    asked on February 2, 2011
  33. science

    an electron in a one-dimensional box requires photons with a wavelength 8080 nm to excite it from the n=2 energy level to the n=3 energy level. calculate the length of the box

    asked on December 14, 2010
  34. Psychology

    Classical Conditioning. 2. Pat feels fear whenever she sees snow. Not too long ago, she got into a car accident on a snowy road. a. Name the unconditioned stimulus(US): Car accident b. Name the conditioned stimulus(CS): Seeing snow c. Name the

    asked on July 12, 2015
  35. Chemistry

    Calculate the change in enthalpy produced by dissolving 14.3 g of NaOH in 65.0 g of water if the temperature increases 49.1°C and the specific heat of water is 4.18 J/g°C Do I have to use the 14.3g of NaOH?

    asked on February 7, 2018
  36. alg

    An amplifier has an input power of 5 mW. The output power is 100 mW. What is the decibel gain to the nearest decibel?

    asked on June 28, 2012
  37. math

    A farmer is installing a fence. The coordinates of the vertices of the fence are A(2,2), B(2,6), C(8,6), D(8,2). If each grid square has length of 9 yards, how much wire is needed for the fence?

    asked on May 12, 2015
  38. reading

    the reason the test questions and answers is up there because its all wrong answers on purpose for cheaters. when i first started i passed two test by myself. then the last three test try to cheat to use the answers and failed three test then retook them

    asked on July 9, 2012
  39. Math

    Nico was stunned when he opened the mail. Here was a check for $322.50! This was the interest he earned on his investment. One year ago Nico had been given $5,000. His parents made him put it in the bank and save it for college, but they said he could keep

    asked on April 16, 2012
  40. Calc

    If dy/dx = x²y², then d²y/dx² = ?

    asked on January 2, 2011
  41. 6th grade

    If today is Tuesday, what integer stands for last Sunday?

    asked on May 4, 2010
  42. chemistry

    A student measure 9.43 mL of an unknown liquid in a graduated cylinder. The mass of the empty cylinder is 34.670 g, and the mass of the cylinder and liquid is 44.197 g. What is the density of the unknown liquid? (remember significant figures and units in

    asked on September 14, 2015
  43. English

    After they heard the winner announced, Greg’s friends congratulated him. Then teased him to take them out for pizza. Help with sentence structure please

    asked on March 24, 2019
  44. math

    the dome over a town hall has a parabolic shape. the dome measures 48 m across and rises 12m at the centre. A vertical column needs to be attached to the dome at a point that is 4m away from its rim. How tall is the dome at this point? Also, what is the

    asked on August 31, 2012
  45. math

    a popular tourist attraction in ottawa is the Peace tower, which rises from the Center Block of the Parliment buildings. Describe at least one method that you could use to estimate the height of the tower, including the measurments you would need to make.

    asked on August 13, 2012
  46. Physics

    Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each

    asked on November 21, 2006
  47. math

    The student council has decided to sell t-shirts for a fundraiser. The printing company charges a $75 set-up fee plus $3 per shirt. The student council plans to sell their t-shirts for $12 per shirt. Write a function p(t) to represent the student council's

    asked on May 5, 2014
  48. Chemistry

    large dose of vitamin C are supposed to cure the common cold. One commercial over-the-counter product consists of 500-mg tablets that are 20% by weight vitamin C. How many tablets should one take for a 1.30g dose of vitamin C?

    asked on January 20, 2012
  49. Calculus

    A 20m ladder is leaning against a wall. Top of ladder is sliding down at 3m per second and the bottom is sliding away from the wall at 4m per second. How high is the top of the ladder and far is the bottom of the ladder from the wall.

    asked on July 23, 2016
  50. Math

    the design below grows each day, as shown. if the pattern continues to grow like this, how many tiles will there be in the design on the tenth day? on the fiftieth day? Day 1 1 tile Day 2 5 tiles Day 3 13 tiles

    asked on March 5, 2012
  51. physical science

    you are standing on a street corner, and you hear a fire truck approaching. does the pitch of the siren stay constant, increase, or decrease as it approaches you? does the pitch of the siren stay constant, increase, or decrease as it moves away?

    asked on May 23, 2011
  52. Ethics in Criminal Justice

    Engaging in lawbreaking behavior to achieve a reputation or gain status among peers would be most consistent with which of the following stages of moral development, according to Kohlberg's model? A. Punishment/Obedience B. Law and Order C. Social Contract

    asked on April 27, 2014
  53. Differential Equations

    Consider the differential equation: dy/dt=y/t^2 a) Show that the constant function y1(t)=0 is a solution. b)Show that there are infinitely many other functions that satisfy the differential equation, that agree with this solution when t0 [Hint: you need to

    asked on January 31, 2013
  54. physics

    lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees

    asked on November 21, 2006
  55. Math

    Tino conducted a survey of all the eighth graders in his school for his math project.  He asked each student how much he or she spent on school supplies at the beginning of the year (rounded to the nearest dollar).  He also calculated the average amount

    asked on May 8, 2012
  56. Ethics in Criminal Justice

    The argument that aiding or assisting others might be degrading to them, implying that they are incapable of helping themselves, is an argument commonly used to support: A. Qualitative varieties of utilitarianism. B. Hedonism. C. Ethical egoism D. Plea

    asked on May 3, 2014
  57. Math

    I snap my fingers now. in one second, i snap them again. I wait two seconds and snap them a third time. I wait four seconds before snapping them again. then i wait eight seconds, then sixteen, and the pattern continues on. the interval between snaps

    asked on March 13, 2012
  58. english

    What roles are played by the female characters you encountered in this unit? Describe some of these female characters, their traits, and the roles they played within the selections you read, especially considering that all of those selections had male

    asked on February 19, 2019
  59. Physics

    a 1.0 metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase? (Chead=0.11 kcal/kg degrees C) 1/2 m v^2 = mc Deltatemp solve for

    asked on November 21, 2006
  60. Chemistry

    The density of aluminum is 2.70 g/ml. What is the mass of a cube of Al that measures 2.20 cm on each side?(remember significant figures and to include the units of g in your answer, remember that 1 ml=1 cm3)

    asked on September 14, 2015
  61. Trig

    A jet is 115 mi east and 88.3 i north of Niagara Falls. What is its displacement from Niagara Falls?

    asked on December 1, 2014
  62. Algebra 2

    On some tubes of caulking, the diameter of the circular nozzle opening can be adjusted to produce lines of varying thickness. The table shows the length l of caulking obtained from a tube when the nozzle opening has diameter d and cross-sectional area A.

    asked on March 3, 2012
  63. FREE BODY DIAGRAM calculus

    A car is traveling north towards an intersection at 60mph at the same time a truck is headed east toward the same intersection at 45mph. Find the rate of change of the distance between the car and truck when the car is 3 miles south of the intersection and

    asked on October 7, 2012
  64. psychology

    Today, most psychologists take ____ approach to human development. a nativist an empiricist a dualist an interactionist

    asked on November 2, 2010
  65. Chemistry

    The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: a)the coordination number of Li and S b) the number of formula nunits in the unit cell c) the density of Li2S

    asked on April 15, 2009
  66. 11th grade

    your pet dog runs around in circles, chasing his tail. Does this mean acceleration?

    asked on September 18, 2008
  67. Pre-Calculus

    The logistic growth model p(t)=0.90/1+3.5e^-0.339t relates the proportion of new personal computers sold @ Best Buy that have Intel's latest coprecessor t months after it has been introduced. a) what proportion of new personal computers sold @ Best Buy

    asked on October 19, 2006
  68. Probability/Distribution

    A catalyst researcher states that the diameters (in microns) of the pores in a new product catalyst she has made have an exponential distribution with parameter ë = 0.25 (35 pts). (a) Determine the mean pore size. (b) Determine the standard deviation of

    asked on October 11, 2016
  69. algebra1

    the problem is 5f+7 less than or equal to 22. can anyone please work this out for me and check it for me? and what i mean by checking it is like when you get the answer you check it and make sure its write.

    asked on October 1, 2013
  70. Chem

    The field of nanotechnology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encapsulating them in carbon

    asked on October 8, 2011
  71. Calc

    A rectangular box, with a square base and open at the top is to be constructed. If the volume of the box needs to be 108 cubic feet, what is the minimum surface area?

    asked on January 23, 2011
  72. Calc

    Use differentials to approximate the change in the volume of a cube when the side is decreased from 8 to 7.99 cm. (in cm^3) Thank you so much!!

    asked on April 25, 2011
  73. math

    How can you use an equation to make a prediction from a pattern?

    asked on August 30, 2018
  74. chemistry

    Convert 1.01 x 10-8 seconds to nanoseconds

    asked on September 14, 2015
  75. Ethics in Criminal Justice

    The correlativity of rights and duties means that: A. moral duties override moral rights. B. moral rights override moral duties. C. the existence of moral rights implies duties by which others must abide. D. None of the above. I think it's B. Am I right?

    asked on May 8, 2014
  76. Pre-Calculus

    The period T (in seconds) of a simple pendulum is a function of its length l (in feet), given by T(l) = 2pi sq root of l/g, where g = 32.2 feet per second per seconds is the acceleration of gravity. Express the length l as a function of the period T. If

    asked on October 5, 2006
  77. pre-calculus

    the spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t)= 200 square root of t, find the area A of the oil slick as a function of the time t. You know that the area of a circle is

    asked on October 3, 2006
  78. computers

    Open your text editor (Notepad) and type the following code: My sample HTML page This is an HTML page

    asked on February 28, 2019
  79. Ethics in Criminal Justice

    The correlativity of rights and duties mean that: A. moral duties override moral rights. B. moral rights override moral duties. C. the existence of moral rights implies duties by which other must abide. D. None of the above. I think the answer is A but not

    asked on May 10, 2014
  80. Ethics in Criminal Justice

    Which of the following might help us develop open-mindedness and the virtue of tolerance? A. Recognizing that people have free will. B. Recognizing that moral norms can and often do vary by time and place. C. Developing our own sense of egoism. D. All of

    asked on April 21, 2014
  81. calculus

    A fence 8 feet tall stands on level ground and runs parallel to a tall building. If the fence is 1 foot from the building, find the shortest ladder that will extend from the ground over the fence to the wall of the building.

    asked on October 11, 2012
  82. Calc

    The base of a solid is a circle of radius a, and its vertical cross sections are equilateral triangles. The volume of the solid is 10 cubic meters. Find the radius of the circle.

    asked on February 10, 2011
  83. Chemistry

    The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: (I could not paste the actual picture from the assignment here, but if you go to Google Image and type in "crystal

    asked on April 14, 2009
  84. Science

    How do clouds form, and where in canada would you expect to see certain types of clouds. What is the difference between clouds and fog? http://en.wikipedia.org/wiki/Cloud

    asked on May 20, 2007
  85. Calculus

    Suppose that you follow the size of a population over time. When you plot the size of the population versus time on a semilog plot (i.e., the horizontal axis, representing time, is on a linear scale, whereas the vertical axis, representing the size of the

    asked on October 30, 2011
  86. Pre Calculs

    The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles per liter. Values of pH range from 0 (acidic) to 14 (alkaline). (a) what is the pH of the solution for which [H+] is 0.1? (b)

    asked on October 10, 2006
  87. math

    MOVIE CLUB Members of a movie rental club pay $15 annual membership fee and $2 for new release movies. Non Members pay $3 for new release movies. a. Write a system of linear equations that represent this situation. b. When is it beneficial to have a

    asked on January 8, 2014
  88. Math

    At Irv's Rental Shop, Irv rents all kinds of cycles: unicycles, tandem bikes, regular bikes, and even tricycles for little kids. He parks all the cycles in front of his shop with a helmet for each rider strapped to the cycles. This morning Irv counted 57

    asked on May 15, 2012
  89. Chemistry

    2NaOH+2Al+2H2O --> 2NaAlO2+3H2 here is the reaction. If i am trying to find the mass of hydrogen produced and i am trying to convert .95 moles Al to moles H, which number from the reaction do I use for H when converting from moles to moles? Do I 6 because

    asked on March 9, 2012
  90. Binomial

    Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions? a.

    asked on November 24, 2010
  91. Pre-Calculus

    The monthly revenue acheived by selling x boxes of candy is calculated to be x(5-0.05x)dollars. The wholesale cost of each box of candy is $1.50. How many boxes must be sold each month to achieve a profit of at least $60. Can someone please let me know how

    asked on September 19, 2006
  92. Engineering Math

    An unknown radioactive element decays into non-radioactive substances. In 120 days the radioactivity of a sample decreases by 59 percent. What is the half life of the element? How long will it take for a sample of 100 mg to decay to 77 mg? The answer is

    asked on September 23, 2016
  93. Physics!

    Imagine a giant dry-cleaner's bag full of air at a temperature of -31 floating like a balloon with a string hanging from it 15 above the ground. Estimate what its temperature would be if you were able to yank it suddenly back to Earth's surface.

    asked on May 2, 2013
  94. Calc

    A particle moves along a path described by x=cos³t and y=sin³t. The distance that the particle travels along the path from t=0 to t=π/2 is... Thank you!

    asked on April 25, 2011
  95. Calc

    The amount A(t) of a certain item produced in a factory is given by A(t) = 4000 + 48(t - 3) - 4(t - 3)³ where t is the number of hours of production since the beginning of the workday at 8:00 am. At what times is the rate of production increasing most

    asked on January 2, 2011
  96. Physics

    Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0 degrees C. Explain. qice=mass*heat of fusion. qH2O=mass*specific heat x delta T However, you aren't given a two temperatures;

    asked on November 21, 2006
  97. ODE Piecewise

    Solve the piecewise linear ODE, y' - y = f(x), y(0) = 1, where f(x) = 1 when 0 \le x \le 1 and f(x) = -1 when x > 1. What is y(2)? Round to the nearest tenth. I stated and got y'-y= ce^x , but wasn't really sure if that was right so I didn't know where to

    asked on September 23, 2016
  98. Math 221

    what is 13/15 divided by 7/10

    asked on July 13, 2014
  99. Ethics in Criminal Justice

    If we eliminate free will completely, we would also be eliminating: A. the possibility of genetic bases for human behavior. B. The value of modern science. C. Moral responsibility. D. Excuses for criminal conduct.

    asked on April 13, 2014
  100. Chem

    Calculate the amount (in moles) of H₂O in 2.00g of Na₂CO₃ ⋅ 10H₂O. Thanks so much!!

    asked on October 8, 2011

Pages

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5