erica

Popular questions and responses by erica
  1. 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
  2. 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
  3. physics

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

    asked on October 15, 2012
  4. 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
  5. 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
  6. 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
  7. History

    In which world regions or countries was the Seven Years’ War fought? a.)Australia, South America, China b.)North America, Western Europe, India c.)North Africa, Mexico, Japan d.)Scandinavia, Middle East, Afghanistan I think it is B

    asked on July 2, 2020
  8. Mathematics

    The segment shown is half of AB, where B (-5,1) is one endpoint of the segment and M (-3,3) is the midpoint of the segment. What are the coordinates of point A

    asked on June 5, 2020
  9. 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
  10. 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
  11. 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
  12. Physics please i really need help

    Suppose a car is traveling at +23.7 m/s, and the driver sees a traffic light turn red. After 0.427 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 9.00 m/s2. What is the stopping distance of the car, as measured

    asked on February 1, 2016
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. Calc

    If dy/dx = x²y², then d²y/dx² = ?

    asked on January 2, 2011
  19. chemistry

    Convert 1.01 x 10-8 seconds to nanoseconds

    asked on September 14, 2015
  20. 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
  21. 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
  22. math

    a small farm field is a square measuring 340 ft on a side. what is the perimeter of the field?

    asked on July 26, 2013
  23. 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
  24. math

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

    asked on August 30, 2018
  25. 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
  26. weber state university

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

    asked on April 11, 2013
  27. 11th grade

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

    asked on September 18, 2008
  28. 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
  29. Differential Equations (Another) Cont.

    For the following initial value problem: dy/dt=1/((y+1)(t-2)) a)Find a formula for the solution. b) State the domain of definition of the solution. c) Describe what happens to the solution as it approaches the limit of its domain of definition. Why can't

    asked on January 31, 2013
  30. Math

    The charges on a monthly water bill came to $0.86 per cubic meter of water used, plus a service charge of $4.49. Last month Jeremy's water bill came to $69.85, how many cubic meters of water had he used?

    asked on January 25, 2013
  31. Algebra 2

    Find the value of c that makes the expression a perfect square trinomial. Then write the expression as the square of a binomial. I didn't really understand what that meant. x^2-23x+c x^2-(2/7)x+c

    asked on December 5, 2011
  32. 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
  33. 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
  34. Managarial Finance

    "Stephenson Real Estate Company was founded 25 years ago by the current CEO, Robert Stephenson. The company purchases real estate, including land and buildings, and rents the property to tenants. The company has shown a profit every year for the past 18

    asked on October 8, 2012
  35. 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
  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. Algebra 2

    From 1990 to 1994, the mail order sales of health products in the United States can be modeled by S = 10t 3 + 115t 2 + 25t + 2505 where S is the sales (in millions of dollars) and t is the number of years since 1990. In what year were about $3885 million

    asked on December 30, 2011
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. chemistry

    How many inches are in 2.41 m? (2.54 cm = 1 inch, remember significant figures and units)

    asked on September 14, 2015
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. Calc

    Locate any relative extrema and inflection points. y = (ln x)/x

    asked on December 2, 2010
  53. Psychology

    This is a homework assignment for my Psychology course on Memory and learning. Find a Movie/video clip (1-3 mins)that demonstrate a concept / phenomenom relevant to learning and memory? My prof used Matrix (what we see is just our neuron firing) and Bourne

    asked on March 12, 2009
  54. Pre calc

    How do you write a quadratic equation in standard form for a given set of zeros?

    asked on August 2, 2008
  55. math

    robert bought a used car for $1,500.00 if the sales tax is 5% what is the total that he paid?

    asked on February 12, 2008
  56. 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
  57. 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
  58. Trigonometry

    Find the remaining trigonometric values if sin=-3/5 and theta terminates in Quadrent four. I'm not sure what they're asking

    asked on February 1, 2017
  59. Cal 3

    Find critical points for f(x,y)= x^3+y^3-15x^2-6xy+18y^2+39x+138y I know you first take the partial derivative of x and y, but I am not sure where to go from there.

    asked on December 6, 2016
  60. Math

    The figure below are similar (their rectangles) find The value of x. Skinny rectangle has 2 on the top, and it has 4 on the side. Bigger rectangle it's side ways, it has 8 on the top and x on the side

    asked on April 4, 2016
  61. Physics HELPPP

    (0 m/s)^2 - (23.7 m/s)^2 divided by 2(9.00 m/s)^2 ?

    asked on February 1, 2016
  62. Math 221

    what is 13/15 divided by 7/10

    asked on July 13, 2014
  63. Differential eqns

    a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your

    asked on February 3, 2013
  64. 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
  65. 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
  66. Statistics

    Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 100 people. (a) How many would you expect to be between 157 and 173 cm tall? (b) How many would you expect to

    asked on March 14, 2012
  67. Probability

    Automated chemical synthesis of DNA has made it possible to custom-order moderate length DNA sequences from commercial suppliers. Assume that a single nucleotide weighs about 5.6 X 10^-22 grams and that there are four kinds of nucleotides. If you wish to

    asked on January 16, 2012
  68. 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
  69. calc

    The rate that an object cools is directly proportional to the difference between its temperature ( in Kelvins) at that time and the surrounding temperature (in Kelvins). If an object is initially at 35K, and the surrounding temperature remains constant at

    asked on April 25, 2011
  70. Calc

    A rectangle is to be inscribed in a semicircle of radius 8, with one side lying on the diameter of the circle. What is the maximum possible area of the rectangle?

    asked on February 22, 2011
  71. Calc

    Find the arc length of the graph of the function over the indicated interval. y = (x⁵/10) - (1/(6x³)) , [1,20] Thank you so much!!

    asked on February 6, 2011
  72. Calc

    How do you integrate sin²x?

    asked on February 2, 2011
  73. Calc

    The slope of a curve at each point (x,y) is given by 4x - 1. Which of the following is an equation for this curve if it passes through the point (-2,3)? A) y=4x²-x-15 B) y=x²-4x-9 C) y=2x²-x-7 D) y=2x²-x E) y=2x²-x+7

    asked on January 23, 2011
  74. 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
  75. Statistics

    A group of 56 randomly selected students have a mean score of 30.8 and a standard deviation of ó = 4.5 on a placement test. Find a 95% confidence interval for the mean score, ì, of all students taking the test.

    asked on November 1, 2010
  76. 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
  77. math Thanks to everyone for the help it's needed!

    what would be the radius of a circle with a diameter of 8 inches?

    asked on February 12, 2008
  78. Social studies

    what is the function or purpose of public radio and television in a democratic society

    asked on April 15, 2020
  79. Social studies

    which of the following best illustrates how a president can use the news media to reach the largest segment of the public? 1. hold a state dinner for foreign dignitaries 2. hold a conference with cabinet members 3. meet with heads of congressional

    asked on March 10, 2019
  80. Introduction to computers

    What are the steps to choosing the right computer to purchase? What are some of the choices within each step?

    asked on May 16, 2018
  81. math

    A card is selected from a deck. Find the following probabilities. A standard deck of cards has 52 Cards. There are 13 values and 4 suits. Suits are Spades, Clubs, Diamonds and Hearts. Each suit has 13 cards. There are 3 face cards Jack, Queen, and King. a

    asked on July 3, 2017
  82. 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
  83. Physics

    A car goes North at 55mi/hr for 1.3 hrs. It then goes East at 65mi/hr for 45 min. What is the total distance travelled, total displacement,average speed and average velocity of the car?

    asked on September 9, 2016
  84. 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
  85. Physics

    The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. Initial Velocity (a) +12 m/s

    asked on February 1, 2016
  86. chemistry

    Convert 15 ºF to degrees K. (Just type the number with correct sig figs, do worry about finding the degree symbol)

    asked on September 14, 2015
  87. 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
  88. chemistry

    From the reaction below, calculate the free energy of formation for CH4(g) at 25°C, if ΔGfo(C8H8(g)) is 214.417 kJ/mol. 8CH4(g) ↔ C8H8(g) + 12H2(g) ΔGo = 620.735 kJ/mol I don't understand what equation to use. I thought it was dGfo-dGo but that

    asked on May 3, 2014
  89. 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
  90. 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
  91. Ethics in Criminal Justice

    The power to make choices and engage in actions that originate with ourselves is referred to as: A. Free will B. Objectivism. C. Determination. D. Predetermination.

    asked on April 13, 2014
  92. algebra

    A newspaper carrier has $4.00 in change. He has two more quarters than dimes but five times as many nickels as quarters. How many of coins of each type does he have. This is what I got so far and then I get lost. dimes = x quarters = x+2 nickels = 5(x+2)

    asked on February 12, 2014
  93. Physics

    You are holding a bulletin board weighing 7.01 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this

    asked on October 2, 2013
  94. math

    Select a real life object (tree flagpole ect) or distance that cannot be measured directly. Describe how to measure an object or distance by right-angled trigonometry using methods such as SOH CAH TOA or the pythogrorean theorem. Organize all the data you

    asked on August 14, 2012
  95. Probability

    A drawer contains six bags numbered 1-6, respectively. Bag i contains i blue balls and 2 green balls. You roll a fair die and then pick a ball out of the bag with the number shown on the die. What is the probability that the ball is blue? Thank you!

    asked on January 27, 2012
  96. Calc

    Solve: du/dt = (sin t) / (u^2 + 1) So far I got: arctan u = -ln |csc t + cot t| + C I'm not sure where to go from there. Thank you so much for the help!

    asked on October 31, 2011
  97. Statistics

    The production process of computer parts uses two machines one old & one new. If the old machine is used the probability that the defected part is produced is .13 if the new machine is used the probability that the defective part is produced is .04.

    asked on October 12, 2011
  98. Chem

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

    asked on October 8, 2011
  99. Acct

    Journalize the following transactions -Received cash from investment made by owner,$15000. Received cach providing accounting services, $8000. Billed customers on account for providing services, $4000. Paid Advertising expense 400. Received cash from

    asked on September 20, 2011
  100. Science

    What is the pressure at the bottom of a tube of mercury that is 0.2 m deep? An elephant with a mass of 1000 kg stands on a circus platform that weighs 50 kg. The area of the bottom of the platform is 1.25 m². How much pressure is exerted on the floor

    asked on September 15, 2011

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