Popular questions and responses by Kelsey
  1. Chemistry

    Consider the decomposition of a metal oxide to its elements, where M represents a generic metal. M203(s)---> 2M(s) + 3/2 O2(g) info given for Gf(kJ/mol): M203= -10.60 M(s)=0 O2(g)= 0 1.) what is the standard change in Gibbs energy for rxn as written in

    asked on March 15, 2012
  2. chemistry

    2H2O2 --- 2H2O + O2 is this a redox reaction if so what is the oxidized reactant and reduced reactant

    asked on August 26, 2010
  3. probability

    Betty has several of the standard six-sided dice that are common in many board games. If Betty rolls one of these dice, what is the probability that she rolls a three? use 3 decimal places.

    asked on March 27, 2016
  4. Precalculus check answers help!

    1.) Find an expression equivalent to sec theta sin theta cot theta csc theta. tan theta csc theta sec theta ~ sin theta 2.) Find an expression equivalent to cos theta/sin theta . tan theta cot theta ~ sec theta csc theta 3.) Simplify (tan^2 theta +

    asked on May 30, 2012
  5. English answer check

    15. Which of the following sentences uses the passive voice? Almost every night Frances sang her son the same lovely lullaby. Because of the light color, Jason gave the room a second coat of paint. Have you ever been taken to the state fair? Despite her

    asked on May 2, 2012
  6. mathematics

    it takes 12 men to make 12 tables in 9 hours. how long will it take 8 men to make 32 tables?

    asked on October 16, 2010
  7. Physics

    A speeding car is traveling at a constant 30.0 m/s when it passes a stopped police car. The police car accelerates at 7.0 m/s^2. a)how far will the police travel to catch up to the speeder? b) how fast will it be going when it catches up?

    asked on August 28, 2012
  8. Physics help please**

    A water pipe having a 2.1 cm inside diameter carries water into the basement of a house at a speed of 0.88 m/s and a pressure of 169 kPa. The pipe tapers to 1.0 cm and rises to the second floor 7.1 m above the input point. (a) What is the speed at the

    asked on November 24, 2008
  9. physics PLEASE!!

    A 63 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A in Figure 8-25 is 7.9 m/s, what is the normal force exerted by the snow on the skier at point B?

    asked on October 8, 2008
  10. physics

    A 1000 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the kinetic frictional force f_k between the boat and water is proportional to the speed v of the boat: f_k = 70v, where v is in meters per second and f_k is in newtons.

    asked on August 30, 2010
  11. Physics

    For chlorine gas, the van der Waals constants are: a = 0.658 J·m3/mol2, and b = 5.62 × 10-5 m3/mol. A 3.0-L tank contains 10.0 moles of chlorine gas at a temperature of 625 K. What is the pressure in the container? A) 15.0 MPa B) 17.3 MPa C) 13.5 MPa D)

    asked on September 9, 2015
  12. Math Help..!

    A stock's price dropped from $63.28 per share to $27.45. What was the loss on a single share of the stock?

    asked on October 27, 2014
  13. chemisry

    Cd/Cd2+//H+/H2/Pt Write the oxidation and reductionhalf reactions. Sketch a possible deisgn cell. I am unclear on the Pt portion and the charges ?

    asked on August 30, 2010
  14. History

    Which of these was a consequence of the Civil War? A- General William Tecumseh Sherman's March to the Sea destroyed Southern transportation lines. B- President Lincoln's Gettysburg Address persuaded the South to disarm and surrender. C- Maryland became a

    asked on October 27, 2019
  15. Physics

    James Cameron piloted a submersible craft to the bottom of the Challenger Deep, the deepest point on the ocean's floor, 11,000 m below the surface. What was the total inward force on the 1.1-m-diameter pilot sphere in which Cameron sat?

    asked on August 21, 2018
  16. chemistry

    At a certain temperature, the equilibrium constant, K, for this reaction is 53.3. H2(g)+I2(g)->2HI(g) At this temperature, the reactants were placed in a container to react. If the partial pressures of H2 and I2 were each 0.300 bar initially, what is the

    asked on March 12, 2015
  17. Physics

    A Nordic jumper goes off a ski jump at an angle of 10.0° below the horizontal, traveling 109.0 m horizontally and 44.0 m vertically before landing. (a) Ignoring friction and aerodynamic effects, calculate the speed needed by the skier on leaving the ramp.

    asked on September 18, 2013

    1. Which of the following quotations is the best example of a paradox? (1 point)“I’ll drain him dry as hay. . . ” “Lesser than Macbeth, and greater.” “So well thy words become thee as thy wounds. . . ” 2. Which of the following is an example

    asked on October 14, 2012
  19. Analytic Geometry

    Given two planes, discuss the methods used to determine if the planes are parallel, perpendicular, coincident, or none of these.

    asked on May 10, 2012
  20. Physics

    A box weighing 600 N is pushed along a horizontal floor at a constant velocity with a force of 250 N parallel to the floor. What is the coefficient of Kinetic friction between the box and the floor?

    asked on October 13, 2010
  21. MAth

    Round to the nearest hundred and the nearest tenth. 625

    asked on September 22, 2010
  22. physics

    The moon has a mass of 7.35 E 22 kg and is located 3.84 E 8 meters from the Earth. If Ellen, an earthling, has a mass of 47 kg, what is the gravitational force between Ellen and the moon?

    asked on April 21, 2010
  23. Algebra

    Consider the graph of the equation y=ax^2+bx+c, when a does not equal 0. If a is multiplied by 3, what is true of the graph of the resulting parabola? (A) The Vertex is 3 units above the vertex of the original. (B) The new parabola is wider than the

    asked on May 14, 2009

    Choose one destination that is represented by a flag. Write a paragraph about the effects of climate change in that destination.

    asked on May 22, 2014
  25. Physics

    At the airport they have people movers (horizontal escalators). Your friend decides to use the people mover and since you've been sitting decide to walk along side. You would like to continue your conversation and thus need to continue moving at the same

    asked on September 16, 2013
  26. Chemistry

    I need help ASAP! Colligative Properties- Ethylene glycol (C2H6O2) is the principal ingredient in antifreeze. How many grams of ethylene glycol will be needed to lower the freezing point of 2100 grams of water by 20 degrees celcius?

    asked on April 10, 2012
  27. Physics

    A bicyclist is coasting straight down a hill at a constant speed. The mass of the rider and bicycle is 55.0 kg, and the hill is inclined at 16.0° with respect to the horizontal. Air resistance opposes the motion of the cyclist. Later, the bicyclist climbs

    asked on October 25, 2011
  28. Chemistry

    The reaction of fluorine with ammonia produces dinitrogen tetrafluoride and hydrogen fluoride. 5 F2(g) + 2 NH3(g) N2F4(g) + 6 HF(g) (a) If you have 73.7 g NH3, how many grams of F2 are required for complete reaction? b) How many grams of NH3, are required

    asked on January 27, 2011
  29. Medical Terminology

    Could someone please check my answers. If they are incorrect could you please give me the correct answers or tell me where I could find them.. Thanks... 1. A patient has unrealistic thoughts and behaviors despite an awareness that they’re inappropriate.

    asked on May 23, 2010
  30. PLEASE!!

    At the local playground a child on a swing has a speed of 2.14 m/s when the swing is at its lowest point. (a) To what maximum vertical height does the child rise, assuming he sits still and "coasts"? Ignore air resistance. (b) To what maximum vertical

    asked on October 8, 2008
  31. physics

    A crate of mass m (=40 kg) is placed at rest on a (frictionless) inclined plane, which has an angle (= 30o) above horizontal. a.) The force of gravity on the crate is: b.) The normal force on the crate is: size: N c.) The net force on the crate is: size: N

    asked on September 23, 2008
  32. History

    What happened to the population of New Orleans between 1810 to 1830? A) Between 1810 and 1830, the population of New Orleans almost doubled. B) Between 1810 and 1830, the population of New Orleans more than doubled. C) Between 1810 and 1830, the population

    asked on November 10, 2019
  33. Math

    A gasoline tank is 1/6 full. When 21 liters of gasoline were added, it became 3/4 full. How many more liters more is needed to fill it?

    asked on June 21, 2018
  34. Math

    The time needed to complete a final examination in a particular college course is normally distributed with a mean of 83 minutes and a standard deviation of 13 minutes. Answer the following questions. What is the probability of completing the exam in one

    asked on October 22, 2015
  35. chemistry

    Initially, 0.600 mol of A is present in a 4.00-L solution. 2A[aq]->2B[aq]+C[aq] At equilibrium, 0.200 mol of C is present. Calculate K.

    asked on March 12, 2015
  36. HELP MATH !!

    Melanie charges $4.50 per hour when she washes cars, plus $5.00 for supplies. Which function rule represents the amount y Melanie charges to wash cars for x hours? (1 point) a) y = 0.50x b) y = 4.50x + 5.00 c) y = 5.00x + 4.50 d) y = 9.50x The sale price

    asked on May 23, 2014
  37. Precalculus check answers help!

    7.) Write the equation 3x + 4y – 7 = 0 in normal form. 3/5x + 4/5y + 7/5 = 0 -3/5x - 4/5y - 7/5 = 0 -3/5x - 4/5y + 7/5 = 0 ~ 3/5x + 4/5y - 7/5 = 0 8.)Write the standard form of the equation of a line for which the length of the normal is 4 and the normal

    asked on May 30, 2012
  38. Physics

    (a) An ideal gas occupies a volume of 1.6-cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. (b) If the pressure of the 1.6-cm3 volume is reduced to 1.6 10-11 Pa (an extremely good vacuum) while the

    asked on April 25, 2010
  39. physics

    When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the

    asked on March 10, 2010
  40. physics 3

    Static and Kinetic Friction: A 10 kg crate is at rest on a horizontal table (s =0.8, k =0.4). Then various amounts of horizontal pushing force are applied to it. a.) The largest pushing force that can be applied before the crate starts moving is of size: N

    asked on September 23, 2008
  41. Math

    How many posts does it take to support a fence around a square field measuring 200ft on a side if posts are placed every 20ft

    asked on August 27, 2017
  42. Chemistrt

    I'm unsure of how to rearrange Balmer's equation to solve for n2. The equation is 1/lambda= R(1/2^2-1/n2^2)

    asked on May 27, 2017
  43. Algebra

    A 36-meter rope is divided into three pieces. One piece is twice as long as the shortest piece, and the third piece is 1 meter longer than four times the shortest piece. Find the length of the shortest piece.

    asked on October 15, 2016
  44. Physics

    Calculate the total entropy change hat occurs when 2kg of lead at 40 degrees celcius are placed in a very large quantity of water at 10degrees celcius. the specific heat of lead is 0.031 cal/g K).

    asked on September 10, 2015
  45. Pre Algebra

    When adding the sqare root of 25 and negative 9, which type of number is the sum? Whole Number Irrational Number Integer Radical

    asked on November 6, 2014
  46. science help

    Every individual, including young people, can make decisions to use resources wisely. Use the terms reduce, reuse, and recycle to explain how the students in the image can help minimize solid waste.

    asked on May 19, 2014

    Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house.Then describe the ideal energy source for generating most of your home's electricity and explain why you chose

    asked on May 19, 2014
  48. Physics

    Assume that all of the mass of a bicycle wheel is concentrated at its rim. Such a wheel of mass 1.2 kg and radius 30 cm starts from rest at the top of a hill 100m long and inclined at 20 degrees to the horizontal. What will be the speed of the wheel at the

    asked on March 25, 2014
  49. Chemistry

    This question is based on an experiment to determine the mass of ASA. Information from the experiment : • ASA is a weak acid with a Ka value of 3.2 x 10^-4. • An ASA tablet has an approximate mass of 500 mg. • The experiment used a titration with a

    asked on June 4, 2013
  50. Math

    Find the value of y for a given value of x, if y varies directly with x. If y = –252 when x = 84, what is y when x = 74?

    asked on September 1, 2012
  51. Calculus Graph help!!!

    I need help with a calulus graph and figuring out its equation but it wont let me post the picture of the graphs here. so will someone who understands Calculus and their graphs super well please email me k m k underscore horse lover at hot mail dot com. no

    asked on May 2, 2012
  52. Calculus

    Given f"(x)=-25sin(5x)and f'(0)=0 and f(0)=4. Find f(pi/2)

    asked on November 28, 2011
  53. Physics

    The blades of a fan running at low speed turn at 200 rpm. When the fan is switched to high speed, the rotation rate increases uniformly to 340 rpm in 5.92 s. (a) What is the magnitude of the angular acceleration of the blades? (b) How many revolutions do

    asked on December 11, 2010
  54. english

    What is the theme of the poem A Kite is a Victim. What are juxtapositions in this poem

    asked on September 20, 2010
  55. chemisry

    Two half cells in a galvanic cell consist of one iron electroide in a solution of iron sulphate and a silver electrode in a silver nitrate solution a) Assume that the cell is operating as a galvanic cell. State the oxidation half reaction, the reduction

    asked on August 25, 2010
  56. chemistry

    I have posted this once and still cannot get the correct answer. Determine the mass of carbon monoxide that is produced when 45.6 of methane, CH4, react with 73.2 g of oxygen , O2. The products are carbon monoxide and water vapour.

    asked on August 3, 2010
  57. chemistry

    Determine the mass of carbon monoxide that is produced when 45.6 g of methane, ch4 react with 73.2 g of oxygen gas, o2. The products are carbon monoxide and water vapour

    asked on July 27, 2010
  58. physics

    Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string. (one mass is on the incline, the other is hanging from the pullye) The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between

    asked on March 10, 2010
  59. Chemistry 101

    I don't remember my instructor going over this and the book isn't explaining it very well. Can anyone help answer these? Indicate the concentration of each ion or molecule present in the following solutions. 1. 0.30 M NaNO3 2. 1.5x10^-2 M MgSO4 3.

    asked on February 22, 2010
  60. physics 3 !!!

    Assuming your skin temperature is 37.2°C and the temperature of your surroundings is 20.5°C, determine the length of time required for you to radiate away the energy gained by eating a 265 Calorie ice cream cone. Let the emmissivity of your skin be 0.915

    asked on December 4, 2008
  61. physics help pleaseee

    In the figure below, S is a small loudspeaker driven by an audio oscillator with a frequency that is varied from 1000 Hz to 2000 Hz, and D is a cylindrical pipe with two open ends and a length of 55.0 cm. The speed of sound in the air-filled pipe is 344

    asked on November 16, 2008
  62. Chemistry

    How many orbitals are available with the following combination of quantum numbers? 1) n = 2; l = 0 2) n = 3; l = 2 3) n = 4; l = 3 I have figured that it is 1) 2s 2) 3d 3) 4f but i don't know what to do after this.

    asked on April 9, 2017
  63. Math

    Starting from 105 feet away, a person on a bicycle rides towards a checkpoint and then passes it. The rider is traveling at a constant rate of 35 feet per second. The distance between the bicycle and the checkpoint is given by the equation d = 105 - 35t.

    asked on April 4, 2017
  64. interest

    Perry has an opportunity to put $12,000 into an investment with an APR of 5.6% compounded annually. How long will it take his investment to double? (round to one decimal place)

    asked on April 10, 2016
  65. Econ

    Suppose that the U.S. government decides to charge wine consumers a tax. Before the tax, 10 billion bottles of wine were sold every year at a price of $4 per bottle. After the tax, 4 billion bottles of wine are sold every year; consumers pay $7 per bottle

    asked on October 11, 2015
  66. Psychology

    Help me create a mnemonic device to remember the Four Basic Units of Language: Phonemes, Morphemes, Syntax, and Semantics

    asked on March 31, 2015
  67. Chemistry

    Sulfuric acid can dissolve aluminum metal according to the following reaction. 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 24.4g . What minimum amount of H2SO4 in grams would you need?

    asked on March 24, 2015
  68. Health

    Regular exercise stimulates ___ which keeps the skeletal system moving to assist digestion and excretion. A.)peristalsis B.)urea C.)digestion D.)villi

    asked on February 18, 2015
  69. science help !!

    1. Why is California’s high-speed rail such a groundbreaking effort? 2. Why will it take so long to complete the high-speed rail route?

    asked on May 21, 2014
  70. language help !

    On February 12 1908 a difficult automobile race was in progress. Six cars left New York for Paris in a route that included the United States, Japan, Russia, Poland, Germany and part of France Met by blizzards and other dangers the racers nevertheless kept

    asked on May 20, 2014
  71. language help !

    In all of recent American history, there has been no worse river flooding than what occurred on the Mississippi River between late June and the middle of August in 1993. Record flooding affected communities from Minnesota to Missouri. Iowa and Illinois

    asked on May 20, 2014
  72. language help !

    DAD: Where’s the water now? MOM: As high as the car’s wheels. DAD: We’d better go. MOM: We can’t. The car’s dead. DAD: What? MOM: The water is up to the engine; it won’t start. TINA: Oh, no! MARK: What can we do? DAD: I don’t know. (He looks

    asked on May 20, 2014
  73. math help !

    1. A rectangular prism has a width of 92 ft and a volume of 240 ft3. Find the volume of a similar prism with a width of 23 ft. Round to the nearest tenth, if necessary. a)3.8 ft3 b)60 ft3 c)15 ft3 d)10.4 ft3 2.A pyramid has a height of 5 in. and a surface

    asked on May 20, 2014
  74. science

    5. Which of the following causes clouds to form ? a) air cooling to its dew point b) water vapor condensing as it rises into cooler air c) air pressure rising above normal d) air pressure falling below normal 6. Which of these is least liekly to influence

    asked on May 18, 2014
  75. chemistry

    A 37.0 g mass of a metal was heated to 100°C and then plunged into 74 g of water at 24.0°C. The temperature of the resulting mixture became 28.0°C. (a) How many joules did the water absorb? (b) How many joules did the metal lose? (c) What is the heat

    asked on April 27, 2014
  76. language arts

    We saw the months of wicked weather, As day to painful night did turn, Waiting, huddled close together For the frozen sun’s return. Our nights were almost endless torture. Our food was gone. Our fuel was low. We came in search of grand adventure But

    asked on November 22, 2013
  77. Physics

    A boat moves through the water of a river at 9.5 m/s relative to the water, regardless of the boats direction. If the water in the river is flowing at 0.9 m/s, how long does it take the boat to make a round trip consisting of a 300-m displacement

    asked on September 16, 2013
  78. Physics

    A student throws a set of keys vertically upward to her sorority sister, who is in a window 3.80 m above. The keys are caught 1.80 s later by the sister's outstretched hand. (b) What was the velocity of the keys just before they were caught?

    asked on September 11, 2013
  79. Statistics(math)

    (20.47 S-AQ) A sample survey interviews an SRS of 252 college women. Suppose (as is roughly true) that 71% of all college women have been on a diet within the past 12 months. Using Normal approximation, what is the probability (±0.001) that 77% or more of

    asked on June 7, 2013
  80. science

    how can space change your weight in space

    asked on February 14, 2013
  81. Math

    An airplane traveled from Boston to Las Vegas making a stop in St. Louis. The plane traveled 2410 miles altogether, which is 230% of the distance from Boston to St. Louis. Find the distance from Boston to St. Louis to the nearest mile. Please help! Thank

    asked on February 12, 2013

    Noah and Brianna want to calculate the distance between their houses which are opposite sides of a water park. they mark a point, A, 150 m along the edge of the water park from brianna's house. the measure ÚNBA as 80‹and ÚBAN as 75‹.

    asked on January 15, 2013
  83. math(ASAP HELP)

    7. two paths diverge at a 48 degree angle. two mountain bike riders take separate routes at 8km/hr and 12 km / far apart are they after two hours? 8. Draw a diagram to solve this problem: Ajax is 10 km due west of Oshawa. Uxbridge is 18 km NW of

    asked on January 15, 2013
  84. math

    Magnus purchased a car for $35,865. It depreciates about 3.6% each year. What is the value of the car after ten years?

    asked on November 30, 2012
  85. math

    write an equation of an ellipse: Major axis 12 units long and parallel to the y-axis, Minor axis 8 units long, center at (-2,5)

    asked on April 1, 2012
  86. math

    A contactor is making preparations to re-tile the border around a swimming pool. The pool measures 60 feet by 30 feet. The border extends 1 foot from each side of the edge of the pool. The contractor is going to use that are 0.25 feet squared. A case of

    asked on February 29, 2012
  87. Geometry

    the angle of depression from D to F measures 40 degrees. If EF= 14 yd, find DE. round answer to nearest 10th

    asked on February 8, 2012
  88. math

    Ryan takes 12 minutes to rake up and bag a pile of leaves. His sister Kareesa takes twice as long. How many minutes would it take both of them working together to complete 10 bags of leaves

    asked on December 12, 2011
  89. physics

    a baseball (m = 153 g) approaches a bat horizontally at a speed of 41.0 m/s (92 mi/h) and is hit straight back at a speed of 45.8 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.05 ms, what is the average force exerted on the ball by

    asked on November 9, 2011
  90. math (calculus)

    A rectangular sheet of paper of width a and length b, where 0

    asked on October 29, 2011
  91. Chemistry

    How many grams of formaldehyde, H2CO, are in 500 ml of a 40% solution of formaldehyde in water? (Assume for this problem that the density of the formalin solution is 0.98 g/ml)

    asked on September 19, 2011
  92. Physics

    Kathy is changing the tire of her car on a steep hill 20 m high. She trips and drops the 10 kg spare tire which rolls down the hill. What is the speed of the tire at the top of the next hill if the height of the hill is 5 m high?

    asked on May 17, 2011
  93. science

    A 250 kg object is acceelerating at 2.8 m/s2. What force was required to achieve this?

    asked on April 6, 2011
  94. math

    How do i do mixed numbers to improper fractions.

    asked on November 30, 2010
  95. chemistry

    What volume of O2 at 912 mmHg and 33 degrees C is required to synthesize 11.0 mol of NO?

    asked on November 18, 2010
  96. chemisry

    I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;

    asked on August 25, 2010
  97. chemisry

    A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a

    asked on August 16, 2010
  98. chemistry

    A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a

    asked on August 13, 2010
  99. chemistry

    what chemical test can be used to test for lead in water

    asked on August 11, 2010
  100. chemistry

    write a complete strucural formula for each reaction, Name the reactio and then the reactants and products C3H6 + Cl2 --- C3H6Cl2 NH3 + C4H9COOH---C4H9CONH2 + H2o C5H12 = O2 -- CO2 H2O

    asked on August 9, 2010


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