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Popular questions and responses by p
  1. Chemistry

    N2(g) + 3H2(g) -> 2NH3(g) at STP a) How many litres of ammonia gas is produced using 5 litres of H2? b) How many moles of N2 are needed?

    asked on July 29, 2020
  2. Chemistry

    Visit: VIRTUAL LAB: Textbook Style Limiting Reagents Problems on Chem collective Windows and Macintosh users: Please use Firefox or Chrome web browser. The simulation will run on most laptops, desktops and touch-enabled devices such as tablets, iPads or

    asked on July 29, 2020
  3. Chemistry

    Visit: VIRTUAL LAB: Textbook Style Limiting Reagents Problems on Chem collective Windows and Macintosh users: Please use Firefox or Chrome web browser. The simulation will run on most laptops, desktops and touch-enabled devices such as tablets, iPads or

    asked on August 3, 2020
  4. ELA

    100% - The Story of a Patriot Upton Sinclair 1 A young man is walking down the street, quite casually, with an empty mind and no set purpose; he comes to a crossing, and for no reason that he could tell he takes the right hand turn instead of the left; and

    asked on December 7, 2017
  5. Java Programming

    I'm a beginner to Java and I need to know how to do the following: Write a program that will ask the user to enter the amount of a purchase. The program should then compute the state and county sales tax. Assume the state sales tax is 4 percent and the

    asked on October 31, 2010
  6. math

    1. Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $123.00 for 3 days and 300 miles, while Mary was charged $216.00 for 5 days and 600 miles. What does Best Rental charge per day, for mileage?

    asked on November 13, 2011
  7. chemistry

    For the reaction: 2SO2(g) + O2(g) = 2SO3(g) conducted at 25°C and 1 atm. Calculate H°, S°, G°

    asked on February 27, 2015
  8. business law

    Steamatic of Kansas City Inc specialized in cleaning and restoring property damaged by fire, smoke, water, or other elements. It employed Rhea as a marketing rep. His duties included soliciting customers, preparing cost estimates, supervising restoration

    asked on May 3, 2011
  9. Chemistry

    2C(s)+H2(g)+227.4kJ -> C2H2(g) is an endothermic reaction. If 682.2 kilojoules are absorbed, how many moles of C2H2(g) are produced?

    asked on March 21, 2009
  10. trg

    A plane flies in a direction of N70°E for 80 km and then on a bearing of S10°W for 150 km. a How far is the plane from its starting point? b What direction is the plane from its starting point?

    asked on September 15, 2013
  11. Physics

    The surface of the Sun is approximately 5700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1000 J of heat of energy is transferred from the Sun to the Earth?

    asked on November 19, 2012
  12. Physics

    A flat thin non-conducting ring has an inner radius R1 and an outer radius R2 . The disk is uniformly charged with charge per unit area σ(>0) . (a) What is the electric field at the center, P , of the ring? Express your answer in terms of the following

    asked on February 25, 2013
  13. math

    Jenny must sit four papers for an exam. The mean of the first three papers Jenny has sat is 72%. (a)If she wants to get an overall mean of at least 75%,what is the lowest mark she can get in her fourth paper? (b) What is the highest possible mean she can

    asked on April 26, 2016
  14. Physics

    Two point charges attract each other with an electric force of magnitude F. If one charge is reduced to 1/3 its original value and the distance between the charges is doubled, what is the resulting magnitude of the electric force between them?

    asked on February 3, 2013
  15. math

    Solve graphically y = 2x - 6 and y = -2x + 10

    asked on November 13, 2011
  16. Math

    A minor league baseball team plays 78 games in a season. If the team won 15 more than twice as many games as they​ lost, how many wins and losses did the team​ have?

    asked on August 31, 2016
  17. Physics

    Three parallel plate capacitors (C1,C2 and C3 ) are in series with a battery of 100 V. C1=2500 micro Farad; C2=2C1 , C3=3C1 . (a) What is the potential difference over each capacitor and how much charge is on each capacitor? Across C1 :V1 (in Volts) =

    asked on March 13, 2013
  18. Physics

    There is a very large horizontal conducting plate in the plane (consider it infinitely large). Its thickness is . The charge densities on the upper and the lower surfaces are both equal to . The goal of this problem is to find the electric field (magnitude

    asked on February 24, 2013
  19. Physics

    A non-conducting ring of radius with a uniform charge density and a total charge is lying in the - plane, as shown in the figure below. Consider a point P, located at a distance from the center of the ring along its axis of symmetry. (a) What is the

    asked on February 24, 2013
  20. Physics

    Three charges (q1=1 μC, q2=−2 μC, q3=3 μC) are located at the corners of an equilateral triangle with sides of length one meter. The 3 μC charge is: Repelled by q1 and attracted by q2. Attracted by q1 and repelled by q2. Attracted by both q1 and q2.

    asked on February 22, 2013
  21. Physics

    A 64.4-kg skateboarder starts out with a speed of 2.11 m/s. He does 81.6 J of work on himself by pushing with his feet against the ground. In addition, friction does -289 J of work on him. In both cases, the forces doing the work are non-conservative. The

    asked on December 5, 2012
  22. math

    Many people are interested in losing weight through exercise. An important fact to consider is that a person needs to burn off 3,500 calories more than he or she takes in to lose 1 pound, according to the American Dietetic Association. The following table

    asked on September 26, 2009
  23. Chemistry

    How much corn syrup should be added to water to make 200 ml of a 10% by volume solution?

    asked on March 14, 2009
  24. Chemistry

    A student observed the following reaction: AlCl3(aq)+3NaOH(aq) -> Al(OH)3(s)+3NaCl(aq) After the products were filtered, which substances remained on the filter paper and why?

    asked on March 7, 2009
  25. Science

    Crcl3nh33

    asked on July 28, 2019
  26. probability theory

    Let X, Y, Z, be independent discrete random variables. Let A= X(Y+Z) and B= XY With A, B, X, defined as before, determine wheter the folllowing statements are true or false. 1. A and B are independent 2. A and B are conditionally independent, given X = 0.

    asked on October 7, 2018
  27. ELA

    Paired Passages: Sympathy, and An Account of an Experience with Discrimination Paul Laurence Dunbar and Sojourner Truth Sympathy by Paul Laurence Dunbar I KNOW what the caged bird feels, alas! When the sun is bright on the upland slopes; When the wind

    asked on December 7, 2017
  28. Math

    Evaluate the numerical expression. −8/3-(-4/6) A) -2 B) -2/3 C) 2 D) 2/3

    asked on December 7, 2017
  29. Science

    The human stomach is an organ that helps us digest food. The stomach is one of many organs involved in the process of digestion. Others include the esophagus, small intestine, pancreas, and gall bladder. What name is given to a set of organs that work

    asked on December 6, 2017
  30. Physics

    if person 1 has a mass of 31 kg, and person 2 has a mass of 15 kg. And person 1 distance is 1.4 meters. Find person 2 distance?

    asked on November 28, 2017
  31. physics

    You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 4.40 m above the trampoline directly below, so it is perfect for viewing the the

    asked on September 17, 2016
  32. Physics

    A car of mass 1060 kg is on an icy driveway inclined at an angle of 39◦ . The acceleration of gravity is 9.8 m/s 2 . θ If the incline is frictionless, what is the acceleration of the car? Answer in units of m/s 2

    asked on November 18, 2014
  33. trg

    An earth embankment is 27 m long and has a cross-section shown in the diagram. Find the volume of earth needed to build the embankment.

    asked on September 15, 2013
  34. Calc

    Recall that the average velocity between times t1and t2 is calculated using vave = y(t2) − y(t1)/t2 − t1. We are given that y = 14t − 1.86t^2. Evaluating at t = 1, we have y(1) = 14(1) − 1.86(1)2 = 12.14. Thus, the average velocity between times 1

    asked on September 4, 2013
  35. Physics

    The electric and magnetic fields of a plane electromagnetic wave are given by the formulas below, where and are both in meters and is in seconds. This wave is traveling through a medium whose index of refraction is 1.3. Reminder: The "x.xxenn t" notation

    asked on June 15, 2013
  36. Physics

    A certain coaxial cable consists of a copper wire, radius a , surrounded by a concentric copper tube of inner radius c . The space between is partially filled (from b out to c ) with material of dielectric constant K. The goal of this problem is to find

    asked on March 13, 2013
  37. Physics

    An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?

    asked on November 22, 2012
  38. chemistry

    I need help building a 3d model of the apertame molecule Can you give me the correct angles? Thanks

    asked on December 18, 2011
  39. math

    4. Solve the system of equations x + y = 6 x - y = -9

    asked on November 13, 2011
  40. math

    Solve the system of equations x + 3y = 32 -3x + 2y = 3

    asked on November 13, 2011
  41. Biology

    How is it a solution of 300mOsM NaCl is both isotonic and isosmotic to a red blood cell with an osmolarity of 300mOsM? Yet a solution of 300mOsM urea is only isosmotic to that red blood cell?

    asked on October 14, 2011
  42. algebra

    solve for g1: F = kg1g2/r2

    asked on September 26, 2010
  43. math

    how can estimating help you add two-digit numbers?

    asked on September 13, 2010
  44. math

    1. kristi jogged for 3/5 of an hr,swam 1/2 of an hr, rode her bike 3/4 of an hr how long did she exercise?=1 7/20 2.the intersest rate on an equity line of credit was 7 7/8% last month this month the interset rate is 10 3/2% how many percentage points has

    asked on September 19, 2009
  45. math

    LCM OF 35,12,20

    asked on September 10, 2009
  46. MATH 115

    I have math questions I need to check my answers can you please help me 1. 4x4x4x4x4 as a power of 4 answer 4 to the fifth power 2.a bedroom is 10 ft by 11 ft what is the perimeter? answer 42 ft evaluate 72/8-9/3=6 3.Jamal is fencing a rectangular field

    asked on September 5, 2009
  47. Comman Sense

    There is this one term phrase when a solider dies while serving the counrty. Its something like. " in the line of duty." Im not quite sure what it is. Would you tell me the phrase.

    asked on October 4, 2007
  48. History

    Why did the Congress not have the power to tax

    asked on November 3, 2019
  49. Finance

    A company's 5-year bonds are yielding 8% per year. Treasury bonds with the same maturity are yielding 5% per year, and the real risk-free rate (r*) is 3.05%. The average inflation premium is 1.55%, and the maturity risk premium is estimated to be 0.1 × (t

    asked on October 22, 2019
  50. Algebra

    Can someone help me factor: 4u^3+3u^2-9u+2 I don’t understand how to factor 4 terms problems.

    asked on March 28, 2019
  51. ss HELP ASAP!!!

    What conditions most directly resulted from the Imperial Crisis? Select all that apply. A. adoption of Christianity as official religion B. devaluation of money and high inflation C. increase in taxes and greater disparity D. ongoing civil wars E.

    asked on October 29, 2018
  52. Unclear

    What does mean include a photo of materials and or activity?

    asked on October 21, 2018
  53. Language Arts

    Hello. I have an essay question I would like help with. I already wrote it, but I don't feel too sure about it. Please critique it. The question is: The title “Two Kinds” refers to the statement by Jing-mei’s mother that there are only two kinds of

    asked on October 12, 2018
  54. Social Studies

    President George H. Bush was able to convince U.N. forces to invade Iraq in a military effort known as "Operation Desert Storm" because nations feared A) Iraq's leader Saddam Hussein planned to invade Saudi Arabia next, which was an important U.S. ally. B)

    asked on December 11, 2017
  55. Math

    Stewart has $26 dollars. He spent $12.81, including tax, to buy a new DVD. He needs to set aside $10.00 to pay for his lunch next week. If peanuts cost $0.42 per package including tax, describe the maximum number of packages that Stewart can buy? A) p ≤

    asked on December 7, 2017
  56. ELA

    Which description is accurate and true of all three sentences? 1. We struggled to understand the complicated algebraic expressions. 2. We could not wait to hear our grades on the final exam. 3. We failed to demonstrate our knowledge and understanding. A)

    asked on December 4, 2017
  57. Physics

    A Hospital patient has injured her leg, how much mass must be used to keep her leg stationary. The leg has a mass of 2.6 kg and is 0.87 meters in length, the rope for the tension mass is connected at 0.65 meters from the knee.

    asked on November 28, 2017
  58. Physics

    A solid ball of mass 2 kg, rolls down a hill that is 6 meters high. What is the rotational KE at the bottom of the hill?

    asked on November 28, 2017
  59. Physics

    A child swings a sling with a rock of mass 3.8 kg, in a radius of 0.7. From rest to an angular velocity of 8 rad/s. What is the rotational kinetic energy of the rock?

    asked on November 28, 2017
  60. PUBLİC LAW, Political science, ir

    You are a Spanish conquistador who just took control of a large territory in Americas in medieval time. Which political concept requires you that you should obey the orders of the Spanish King and not to administrate the land on your own??(this question is

    asked on April 10, 2017
  61. Science

    Compounds with high melting points have ___ a. Covalent bonds b. Metallic Bonds c. Ionic bonds*** d. No chemical bonds How could you determine if a sample of gold is pure? Compare the sample's density with that of pure gold.*** Compare the sample's color

    asked on September 29, 2016
  62. physics

    You push a skateboard so that it rolls down the road at a speed of 1.40 m/s. You run after the skateboard at a speed of 3.80 m/s and while still behind the skateboard you jump off the ground at an angle of 30.0° above the horizontal hoping to land on the

    asked on September 22, 2016
  63. Pre-Calculus

    Carmen rides her bicycle at a constant rate to the market. When she rides her bicycle back home along the same route, she bikes at three-quarters the rate she biked to the market. At any given time, t, the distance biked can be calculated using the formula

    asked on August 29, 2016
  64. Chemisrty

    A mineral sample is analyzed for its cobalt and calcium content. A sample is dissolved, and then the cobalt and calcium are precipitated as Co(OH)2(s) and Ca(OH)2(s). At what pH can Co(OH)2(s) be separated from Ca(OH)2(s) at 25 °C? Assume that an

    asked on July 9, 2016
  65. calc

    A farmer has a herd of 100 cattle with an average weight of 500 lbs/cow. It costs 50 cents a day to keep each cattle. They are gaining weight at a rate of 6 lbs per day. The market price is now $1 per lb for beef and is falling by 1 cent each day. How long

    asked on March 21, 2016
  66. physics

    A car is initially travelling at 30 m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on. –How far does a car travel

    asked on November 11, 2015
  67. English

    Is the right way to do in text citations.when “you’re ready to go do something else’’ (Jordan).

    asked on March 21, 2015
  68. English

    Can check see if these the right way to do in text citations.when “you’re ready to go do something else’’ (Jordan).

    asked on March 21, 2015
  69. English

    Is this how would do a in text citation?“a dish of coarsely ground corn kernels boiled with water”

    asked on March 21, 2015
  70. Chemistry

    what are the simplest molecules to synthesize a n,n-dimethyl-2-methylpropanamine

    asked on November 8, 2014
  71. Math

    a photocopy store advertises the following prices: 5 cents per copy for the first 20 copies, 4 cents per copy for the 21st through 100th copy, and 3 cents per copy after the 100th copy. Let x be the # of copies, and let y = the total cost of the

    asked on September 7, 2014
  72. chemistry

    write a reaction that show solid copper (II) nitrate dissociating.

    asked on March 27, 2014
  73. algebra

    Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) 4x + 2y = 12 5x − 4y = 2

    asked on March 12, 2014
  74. algebra

    Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) x − y = 2 2x + 3y = 19

    asked on March 12, 2014
  75. math

    Vanessa typically works 8 hours per day in a normal 5 day work week. Last week, however, Vanessa had to take 90 minutes off on Tuesday, 45 minutes off on Thursday, and she left two and a half hours early on Friday. How many hours did Vanessa work last

    asked on November 24, 2013
  76. Math

    Please help and explain how to solve and graph 410 Thanks

    asked on November 10, 2013
  77. math

    Company A rents copiers for a monthly charge of $200 and $0.08 per copy. Company B rent copiers for a monthly charge of $400 and $0.04 per copy. How many copies produce the same bill? The answer I have is 5,0000 is this correct? Thanks

    asked on November 10, 2013
  78. Physics

    A circuit is composed of a capacitor C= 3 micro F, two resistors both with resistance 69 Ohm, an inductor 6.00e-2 H, a switch , and a battery 25 V. The internal resistance of the battery can be ignored . Reminder: The " L=x.xxenn H" notation means " L=x.xx

    asked on June 15, 2013
  79. Physics

    All answers should be in degrees. (a) Using the result of Lecture 31 Question 3, and Snell's law, derive and evaluate for the secondary rainbow for the following values of the incidence angle and index of refraction . 1 , 1.4 incorrect 45 , 1.3 incorrect

    asked on June 5, 2013
  80. interest

    Based on simple interest, find the total amount saved or owed. principal = $1700; rate = 6%; time = 5 years

    asked on May 15, 2013
  81. math

    suppose you roll 2 number cubes. what is the probability that the product of the numbers is a multiple of 7

    asked on May 8, 2013
  82. Physics

    Consider the LR circuit. We have R1=9 Ohms, R2=5 Ohms, R3=19 Ohms, V=2 Volts, L=0.09 H. L and R2 are connected in series, Combination of L and R2 in series is connected with R3 in parallel. This whole combination is connected in series with R1 and voltage

    asked on April 17, 2013
  83. Physics

    A circuit consists of 5 resistors and 3 batteries (see diagram); the connecting wires have all a negligible resistance. The values for R1 , R2 , R3 , R4 , and R5 are 14 Ω, 41 Ω, 68 Ω, 83 Ω, and 110 Ωrespectively. The batteries have a negligible

    asked on March 13, 2013
  84. Physics

    Three conducting straight wires (though insulated from each other) are each 2 m long. They are electrically connected to each other only at their ends points A and B. AB = 2 meter. The wires are cylindrical. One is made of copper, one of aluminum and one

    asked on March 13, 2013
  85. Physics

    Consider a capacitor made of two square plates of side l. The distance between the two plates is d . (a) We insert a dielectric of dielectric constant K>1 and width l a distance x (as in the diagram). What is the total capacitance of this arrangement?

    asked on March 13, 2013
  86. Physics

    A very long cylindrical capacitor consists of two thin hollow conducting cylinders with the same axis of symmetry. The inner cylinder has a radius a, the outer one has a radius b. You may ignore end effects. (a) Fig. 1 (b) Fig. 2 (a) What is the

    asked on March 12, 2013
  87. Physics

    A capacitor consists of two concentric spherical shells. The outer radius of the inner shell is a=0.43 mm and the inner radius of the outer shell is b=2.2 mm . (a) What is the capacitance C of this capacitor? Express your answer in Farads. incorrect (b)

    asked on March 12, 2013
  88. Physics

    An electron is projected, with an initial speed of vi=2.06e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed instantaneously equal

    asked on March 5, 2013
  89. Physics

    Two conducting thin hollow cylinders are co-aligned. The inner cylinder has a radius R1 , the outer has a radius R2 . Calculate the electric potential difference V(R2)-V(R1) between the two cylinders. The inner cylinder has a surface charge density of

    asked on March 5, 2013
  90. Physics

    Two spherical conductors, A and B , are placed in vacuum. A has a radius rA=25cm and B of rB=35cm. The distance between the centers of the two spheres is d=225 cm. A has a potential of VA =120 Volt and B has a potential of VB = -40 Volt. a. An electron is

    asked on March 5, 2013
  91. Physics

    A point-like negatively charged particle of mass m and charge -q is initially released from rest from the point P along the positive z-axis where the magnitude of the electric field is largest. (a) What is the distance from the point P to the origin?

    asked on March 5, 2013
  92. Physics

    Point charges Q1 ,Q2 , and Q3 reside on three corners of a square with sides of 1m ; the distance from Q2 to P3 is 2m (see diagram). (a) What is the electric potential,V , at P1 ? (Normalize the potential to be zero at infinity and give your answers in

    asked on March 5, 2013
  93. Physics

    Three infinite uniformly charged thin sheets are shown in the figure below. The sheet on the left at x=-d is charged with charge per unit area of -3σ , The sheet in the middle at x=0 is charged with charge per unit area of +σ , and the sheet on the right

    asked on March 5, 2013
  94. Physics

    An electron of mass me and charge q=-e is injected horizontally midway between two very large oppositely charged plates. The upper plate has a uniform positive charge per unit area +σ and the lower plate has a uniform negative charge per unit area -σ .

    asked on March 5, 2013
  95. Physics

    There is a very large horizontal conducting plate in the x-y plane (consider it infinitely large). Its thickness is h . The charge densities on the upper and the lower surfaces are both equal to +σ. The goal of this problem is to find the electric field

    asked on February 25, 2013
  96. Physics

    There are two conducting concentric hollow spheres of outer radii R2 and R1 ( R2>R1 ). The thickness of the material of both spheres is d . The inner sphere is negatively charged with charge density -σ1, . The larger sphere is positively charged with

    asked on February 25, 2013
  97. Physics

    A charge-Q is located at x=-l/2 and a charge +Q is located at x=l/2 . Thus the separation between the two charges is l . The total electric field on the x axis can be written as E(x)=E(x)d^ (a) What is the direction d^ of the total electric field at any

    asked on February 25, 2013
  98. Physics

    There are two conducting concentric hollow spheres of outer radii and ( ). The thickness of the material of both spheres is . The inner sphere is negatively charged with charge density . The larger sphere is positively charged with charge density . (a)

    asked on February 24, 2013
  99. Physics

    A charge is located at and a charge is located at . Thus the separation between the two charges is . The total electric field on the axis can be written as (a) What is the direction of the total electric field at any point on the axis where ? (b)What is as

    asked on February 24, 2013
  100. Physivs

    A flat thin non-conducting ring has an inner radius and an outer radius . The disk is uniformly charged with charge per unit area . (a) What is the electric field at the center, , of the ring? Express your answer in terms of the following variables, if

    asked on February 24, 2013

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