Derek

Most popular questions and responses by Derek
  1. math

    How do the graphs of y=1/x and y=5/x+6 compare?

    asked on February 7, 2019
  2. Chemistry

    The aquation of tris(1,10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32++ 3 H3O++ 3 H2O →Fe(H2O)62++ 3 phenH+. If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1,

    asked on December 2, 2014
  3. math

    LeAnn wants to gift wrap a present she got for her little brother. How many square inches of gift wrap will be needed to cover a box that is 5in x 7in x 3in?

    asked on March 19, 2019
  4. Calculus

    At noon, ship A is 130 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 20 km/h. How fast is the distance between the ships changing at 4:00 PM?

    asked on May 10, 2018
  5. probability and statistics

    a set of 10 cards consists of 5 red cards and 5 black cards. the cards are shuffled thoroughly and i choose one at random, observe its color, and replace it in the set. the cards are thouruoghly reshuffled and i again choose a card at random, observe its

    asked on November 24, 2008
  6. Calculus

    An open top bos with a square base is to be constructed from 192 sq ft of material. What should be the dimensions of the box if the volume is to be a maximum? What is the maximum volume?

    asked on October 29, 2012
  7. Calculus

    An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to

    asked on July 2, 2008
  8. Linear programming

    Riverside Oil Company in eastern Kentucky produces regular and supreme gasoline. Each barrel of regular sells for $21 and must have an octane rating of at least 90. Each barrel of supreme sells for $25 and must have an octane rating of at least 97. Each of

    asked on June 26, 2011
  9. Physics 30

    A point charge q=+4.7nC is placed at each corner of an equilateral triangle with sides of 0.21m in length. a) What is the magnitude of the electric field at the midpoint of the three side of the triangle? b) Is the magnitude of the electric field at the

    asked on April 5, 2012
  10. physics

    A 102.0 N grocery cart is pushed 13.0 m by a shopper who exerts a constant horizontal force of 54.0 N. If all frictional forces are neglected and the cart starts from rest, what is its final speed?

    asked on November 12, 2010
  11. physics

    Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator

    asked on November 13, 2012
  12. Chemistry

    The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20°C to 100°C? The density and specific heat capacity of ethylene glycol are 1.11 g/mL and

    asked on October 21, 2015
  13. AP Chemistry

    I have the following marathon problem but am unsure where to start: A Sample consisting of 22.7g of nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00cm, and a piston is carefully placed on the surface of the compound

    asked on October 2, 2007
  14. Statistics

    A teacher gives a reading skills test to a third-grade class of n = 25 at the beginning of the school year. To evaluate the changes that occur during the year, students are tested again at the end of the year. Their test scores showed an average

    asked on February 2, 2017
  15. Chemistry

    How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?

    asked on March 20, 2012
  16. AP Chemistry

    I have the following marathon problem but am unsure where to start: A Sample consisting of 22.7g of nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00cm, and a piston is carefully placed on the surface of the compound

    asked on October 2, 2007
  17. physics

    a 0.1 kg mass is suspended at rest from a spring near the Earth's surface, the distance that the spring is stretched is measured to be 1.0 cm. What is the spring constant of the spring (remember the MKS units)? A mass of 2 kg is attached to a spring with

    asked on November 10, 2010
  18. math

    if the measures of the angles of a triangle are represented by 2x, 3x-15, and 7x+15, the triangle is 1)isosceles triangle 2)right triangle 3)acute triangle 4)equiangular triangle

    asked on May 30, 2008
  19. URGENT SUMMER SCHOOL CALCULUS

    A force of magnitude 15 N is the resultant of two forces, one of which has a magnitude of 8 N and acts at an angle of 30° to the resultant. Find the magnitude and direction of the other force...how do I begin to solve this!?

    asked on June 29, 2008
  20. launguage

    Read the following excerpt from “All Together Now”: What can parents do? We can put our faith in young people as a positive force. I have yet to find a racist baby. Babies come into the world as blank as slates and, with their beautiful innocence, see

    asked on March 12, 2013
  21. Physics

    0.17 kg point mass moving on a frictionless horizontal surface is attached to a rubber band whose other end is fixed at point P. The rubber band exerts a force F = bx toward P, where x is the length of the rubber band and b is an unknown constant. The mass

    asked on November 3, 2010
  22. Calculus

    For the decomposition of Carbon 14, find the age of a prehistoric cave painting discovered in the Lascaux Caves in southern France if the amount of Carbon 14 has decayed to 14.29%...again using calculus formulas. Not sure how to use this equation (content

    asked on July 15, 2008
  23. Math

    a banner requires 1 1/2 sections of plastic. How many banners can be made from 12 sections of plastics? A.7 B.8 C.9 D.15

    asked on March 2, 2013
  24. biology

    [K+] outside = 10 mEq/L and [K+] inside = 150 mEq/L. What effect would reducing the extracellular fluid potassium (K+) concentration from 5mM to 1mM have on RMP and why.

    asked on December 21, 2018
  25. Math

    Add the following vectors using the Triangle Law. 9 N on a heading of [S2°W] and 11 N on a heading of [N31°W]. I've found the magnitude which is 5.9953 but I'm having trouble finding the direction.

    asked on November 13, 2018
  26. Math

    A swimming pool is filled with water at a constant rate of 9 gallons every 10 minutes. After 30 minutes, the pool is filled with 55 gallons of water. Which equation represents this relationship ? F. y= 9x + 55 G. y= 10x + 28 H. y= 9/10x + 28 J. y= 9/10x +

    asked on March 7, 2017
  27. 3rd grade math

    venn diagram circle a numbers:838,848,868,878 circle b numbers:403,509,600,702 What number would you write where the circles overlap?

    asked on October 27, 2011
  28. math

    mario paid $44.25 in taxi fare from the hotel to the airport. the cab charged $2.25 for the first mile plus $3.50 for each additional mile. how many miles was it from the hotel to the airport?

    asked on May 30, 2008
  29. chemistry

    Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. CH4 + O2 → CO2 + H2O

    asked on May 2, 2016
  30. physic

    A charge of -2.73 μC is fixed in place. From a horizontal distance of 0.0465 m, a particle of mass 9.50 x 10-3 kg and charge -9.56 μC is fired with an initial speed of 97.2 m/s directly toward the fixed charge. What is the distance of closest approach?

    asked on October 11, 2012
  31. physics

    After sliding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.8 m/s. Miranda runs after her at a velocity of +4.8 m/s and hops on the inner tube. How fast do the two of them slide across

    asked on June 30, 2013
  32. Calc.

    An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to

    asked on July 6, 2008
  33. math

    the formula C=5/9(F-32) is used to convert Fahrenheit temperature,F, to Celsius temperature,C. What temperature in Fahrenheit is equivalent to a temperature of 100 Celsius. I know that in Fahrenheit its 212 degrees, but i used it by using guess and check.

    asked on May 30, 2008
  34. Math

    In Science, one acetic acid molecule is made of 2 carbon atoms, 2 oxygen atoms, and 4 hydrogen atoms. The ratio of carbon atoms to all atoms in 2 molecules of acetic acid is _____ to _____

    asked on February 3, 2019
  35. math

    the formula for potential energy is p=mgh, where p is potential energy, m is mass, g is gravity, and h is height. what expression can be used to represent g?

    asked on May 30, 2008
  36. Calc.

    I am so confused with this last part of the unit! What in the world is going on: Use normal vectors to determine the interaction, if any, for each of the following pairs of planes. Give a geometric interpretation in each case and the number of solutions

    asked on July 9, 2008
  37. AP Chem

    Pretend you are a nuclear scientist and try to answer this bonus question. Uranium -235 (235U) is used as a fuel in nuclear power plants. However, natural uranium contains mostly U -238 (238U) and very little uranium -235. Therefore, it is necessary that

    asked on November 1, 2010
  38. Mat 126

    A community college has 3,000 students and 90 instructors. The college plans that enrollment will be 3,500 next year. How many new instructors should be hired if the college wants to keep the same student to instructor ratio? 13 instructors 15 instructors

    asked on October 10, 2010
  39. Diagram for already posted question

    A force of magnitude 15 N is the resultant of two forces, one of which has a magnitude of 8 N and acts at an angle of 30° to the resultant. Find the magnitude and direction of the other force..what should my diagram look like? Thanks

    asked on June 30, 2008
  40. algebra

    Gemma recently rode her bicycle to visit her friend who lives 6 miles away. On her way there, her average speed was 16 miles per hour faster than on her way home. If Gemma spent a total of 1 hour bicycling, find the two rates.

    asked on May 2, 2016
  41. 11th grade AP Chemistry

    Pretend you are a nuclear scientist and try to answer this bonus question. Uranium -235 (235U) is used as a fuel in nuclear power plants. However, natural uranium contains mostly U -238 (238U) and very little uranium -235. Therefore, it is necessary that

    asked on October 30, 2010
  42. Summer School Calculus

    Another one for you :P, add these two vectors using trigonometry (again)... 9N[S2W] and 11N[N31W]...Again, I am confused about the angles, I am not sure what value I should use for the cosine and sine law. THANKS AGAIN!!

    asked on June 29, 2008
  43. Urgent SUMMER SCHOOL CALCULUS

    Add these two vectors: I used component law, and I got an answer, but I am unsure as to how to do the direction at the end. Add: 9m/s [N30E] and 2m/s [N60E] I wound up with 10.8m/s and I found an angle of 55 but I am unsure as to what do with the 55:

    asked on June 29, 2008
  44. English

    Which of the following words is different from the others? A. Sell B. Trade C. Barter D. Bargain

    asked on March 2, 2013
  45. Geometry

    The height of a parallelogram is 10 feet more than its base. If the area of the parallelogram is 120 square feet, find its base and height.

    asked on April 18, 2012
  46. Calc.

    Determine vector, parametric and, if possible, symmetric equations for the line through Q(2, -1, 3) and the mid-point of the line segment from L(3, -2, 5) to M(1, 4, -7). Not sure what to do with the mid-point.

    asked on July 4, 2008
  47. math

    Which equation represents the direct variation relationship of the equation x/y=1/2? 1)y=x+1/2 2)y=2x 3)y=3x 4)x=2y

    asked on May 30, 2008
  48. Math

    A fence is 20 ft long. it has posts at each end and at every four feet along its length. how many fence posts are there? Draw a picture.

    asked on May 20, 2013
  49. Summer School Calculus

    Add these two vectors: I used component law, and I got an answer, but I am unsure as to how to do the direction at the end. Add: 9m/s [N30E] and 2m/s [N60E] I wound up with 10.8m/s and I found an angle of 55 but I am unsure as to what do with the 55:

    asked on June 29, 2008
  50. Chemistry

    When magnesium hydrogen carbonate reacts with sulfuric acid, would you consider that an exothermic reaction because it forms CO2 (gas)?

    asked on May 27, 2014
  51. Math

    Denise took a total of 80 calls on her shift at work today. Of those 80 calls, 55% were resolved, 15% escalated to a supervisor, and 10% required that a technician be sent out to the customer's house. What is the total number of calls that Denise resolved

    asked on August 20, 2013
  52. Advanced Algebra

    Write the equation for the depreciation of the value of your car for t years at 14% per year.

    asked on March 28, 2013
  53. Summer School Calculus

    Add the following vectors , 7m/s [N30E] and 2m/s [S17E], using trigonometry. Once you draw these out into diagrams, you use the triangle law yes? How do you find the angles to use in the cosine and sine law? A little confused, thanks for the help.

    asked on June 28, 2008
  54. Politics

    To what extent do wealthy countries, such as the US and the members of the European Union have a responsibility to do more for the refugee crisis? I have to write a short essay on this topic and I do not exactly know how to approach it. Thanks

    asked on February 17, 2017
  55. Physics

    Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.

    asked on March 3, 2013
  56. Physics

    A projectile is fired from the origin with an initial velocity V₁=100m/s at an angle θ₁=30⁰. Another is fired from a point on the x-axis at a distance x₀=60m from the origin with initial velocity V₂=80m/s at an angle of θ₂. It is desired to

    asked on September 22, 2011
  57. physics

    can some one help me with coming with a better way to word theses annswers. As the angle increases, what happens to the tension in the string? *the the tension in the string will get tighter or larger for t1 What would you have to do to the angle to make

    asked on October 20, 2010
  58. physics

    can some one help me with coming with a better way to word theses annswers. As the angle increases, what happens to the tension in the string? *the the tension in the string will get tighter or larger for t1 What would you have to do to the angle to make

    asked on October 20, 2010
  59. English

    I want to know all the Rhetorical and Figurative Devices and Examples in the Essay Hidden Lesson by David Suzuki

    asked on October 26, 2009
  60. physics

    A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone

    asked on September 16, 2008
  61. college pre-calculus

    simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!! answers: A. -y B. y C. -6/y D. -1/y which one?

    asked on January 11, 2015
  62. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  63. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  64. Computer (Visual Basic)

    You are in the process of selecting the BackColors and ForeColors for you new application. When you originally learned to use Visual Studio, you were only aware of one of the palettes that was available to you, but your developer colleague informs you that

    asked on April 9, 2013
  65. Physics

    Roughly how high could a 340 K copper ball lift itself if it could transform all of its thermal energy into work? Assume specific heat for copper equal to 386 J/kg·K.

    asked on March 3, 2013
  66. Calculus

    Find the maximum and minimum product of 2 numbers who sum is 5

    asked on June 27, 2012
  67. physics

    1. An object of mass m and initial speed v0 sliding on a horizontal frictionless surface encounters a frictionless ramp. To what vertical height will the object rise before coming to rest?

    asked on November 3, 2010
  68. physics

    1.If a mass is 15 cm from the axis of rotation and makes 25 revolutions in 10 seconds, what is its speed in m/s? 2.If m = 0.1 kg and the values above still hold, what is the numerical values of the centripetal force?

    asked on October 18, 2010
  69. college-Intermediate Microeconomics

    The Lump Sum Principle In the 1980s Margaret Thatcher was the British Prime Minister. She was very popular and e ective until she pushed for the idea of a so called lump-sum tax. The lump-sum tax is one in which every citizen pays a single xed payment.

    asked on October 8, 2008
  70. math

    if the measures of the angles of a triangle are represented by 2x, 3x-15, and 7x-15, the triangle is 1)an isosceles triangle 2)a right triangle 3)an acute triangle 4)an equiangular triangle

    asked on May 30, 2008
  71. math

    Running at a constant speed, Andrea covers 15 miles in 2.5 hrs. At this speed, how many minutes will it take her to run 2 miles? I know that I need to use conversion but i don't know how to convert it.

    asked on May 27, 2008
  72. math

    Ted is hosting a dinner party. He has a the choice of serving chicken, pasta, or hamburgers for the main course;carrots, lettuce salad, or pineapple for the side dish; and ice cream or cookies for dessert. How many combinations of one main course, one side

    asked on February 17, 2008
  73. alg 2

    Write an exponential function whose graph passes through the given points. 1. (0, 3) and (1, 15) 2. (0, -5) and (-3, -135) 3. (0, -0.3) and (5, -9.6)

    asked on February 12, 2008
  74. Calc. for Reiny

    this can be done by projections of two vector. recall that the scalar projection of vector b on vector a is a∙b/│a│ so let's find a point on the give line, e.g. the point B(6,0,1) (I let t=0) draw a perpendicular from your given point P(1,-5,2) to

    asked on July 10, 2008
  75. Pre-cal

    Given that P=(-1,8) and Q=(-2,1), find the component form and magnitude of the vector 3 PQ.

    asked on May 14, 2016
  76. Math

    If a metal bar at a temperature of 20 degree celcius is dropped in boiling water how long will it take for the bar to reach 98 celcius at a rate of 2 degrees per second

    asked on February 21, 2014
  77. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  78. chemistry

    I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl

    asked on February 5, 2014
  79. Computer (Hardware Support)

    What types of devices use USB ports?

    asked on January 17, 2013
  80. Finance

    A company wishes to issues bonds with a coupon rate of 5%. The company wishes to raise 100 million dollars net of commissions (5% of total sales). Each bond has a face value of $1,000 and matures in 10 years. Interest is to be paid semi-annually. Using the

    asked on December 12, 2012
  81. physics

    An object is located 16.8 cm in front of a convex mirror, the image being 11.5 cm behind the mirror. A second object, twice as tall as the first one, is placed in front of the mirror, but at a different location. The image of this second object has the

    asked on November 14, 2012
  82. Physics

    A gatling gun fires at a rate of 2000 rounds per minute. If the bullets travel at a speed of 800m/s, how far apart are the bullets?

    asked on May 1, 2011
  83. physics

    An object of mass m=2kg travels up an incline to a vertical height of 3m. What is the work done on the object by gravity?

    asked on November 3, 2010
  84. physics

    A 1600 kg car travels at a speed of 10.5 m/s. What is its kinetic energy? Assume that air resistance is negligible.

    asked on October 24, 2010
  85. Health

    Normal urine is ____, as indicated by its pH value. A) slightly alkaline, B) neutral, C) slightly acidic, D) extremely alkaline Normally I would post what my answer is along with the question but on this one I have NO CLUE! I can't find the answer

    asked on September 1, 2010
  86. algebra

    Draw And Shade a figure that represents 150%.

    asked on August 25, 2010
  87. chemistry

    How many grams of ammonia are formed when 1.34 grams of nitrogen react with an excess of hydrogen(3 H2 + N2 reacts to form 2 NH3)(Answer to tenths ex. 2.5)?

    asked on July 6, 2010
  88. writing skills 1

    what is the name of the common error in the sentences

    asked on May 25, 2010
  89. Math

    Find an equation of a plane through the point (1, 5, 1) which is orthogonal to the line x=3+5t y=5-1t z=-1+4t in which the coefficient of x is 5.

    asked on February 1, 2010
  90. Calculus (final question I promise)

    1. Use calculus and algebraic methods to do a complete analysis (i.e., intercepts, critical points, intervals of increase and decrease, points of inflection, intervals of concavity, local maximum or minimum points) for each of the following functions and

    asked on July 28, 2008
  91. Calc.

    Using calculus: If you invest $5000 compounded continuously at 4% p.a. how much will this investment be worth in 5 years? I am not sure what e is. Should my equation be this: A(t)=Pe^rt A(t)=(5000e^(0.04)(5)) Thanks.

    asked on July 15, 2008
  92. math

    Ted is hosting a dinner party. He has a the choice of serving chicken, pasta, or hamburgers for the main course;carrots, lettuce salad, or pineapple for the side dish; and ice cream or cookies for dessert. How many combinations of one main course, one side

    asked on February 17, 2008
  93. Science

    what are the properties of a solid - this is for 5th grade the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape Solids have a

    asked on January 16, 2007
  94. chemistry

    A 6.0-L flask contains 0.60 g at a temperature of 25°C. What is the pressure (in atm) inside the flask?

    asked on April 3, 2017
  95. math

    4x^2+4y^2-16x-24y+51=0 is the equation of a circle. where is the center of the circle and what is it's radius? A. center (2,3) radius=1/4 B. center (2,3) radius=1/2 C. center (-2,-3) radius=1/4 D. center (-2,-3) radius=1/2

    asked on January 11, 2015
  96. Algebra, 0110 HELP!

    Including 5% sales tax, an inn charges $210.00 per night. Find the nightly cost at the inn before tax is added. (a) Write an equation to model the problem. Let x represent the nightly cost before tax. (b) Solve the equation to find nightly cost before tax.

    asked on September 7, 2013
  97. comp

    Which of the following contains a pronoun error? (Points : 2) Neither Jane Austen nor Mary Shelley is known for their poetry. As the curtain rises, everyone in the audience settles into his or her seat and waits for the play to begin. The book sale that is

    asked on May 28, 2013
  98. algebra

    Is v=s2 a quadratic relation?

    asked on March 3, 2013
  99. Physics

    need help with this problem :/ A circular coil (980 turns, radius = 0.078 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.027 s, the normal makes an angle of 45o with the field

    asked on October 28, 2012
  100. science

    A proton (mass m = 1.67 multiplied by 10-27 kg) is being accelerated along a straight line at 2.2 multiplied by 1015 m/s2 in a machine. The proton has an initial speed of 2.4 multiplied by 107 m/s and travels 3.8 cm. (a) What is its speed? m/s (b) What is

    asked on January 20, 2012

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