Most popular questions and responses by Mara
  1. Science

    Please chrck my answer! How does a galvanometer use a magnetic field to indicate the strength of an electric current? When a current is passed through a magnetic field, it goes through a coil and to a galvanometer.

    asked on April 29, 2016
  2. math

    a map is drawn using the scale 2 cm: 100 mi. on the map ,town b is 3.5 centimeters from town a, and town c is 2 centimeters past town b. how many miles apart are town a and town c

    asked on December 30, 2016
  3. english

    Middle Ages 2 Questions PLEASE HELP In what way is the character of Sir Gawain different from other epic heroes such as Beowulf? What is ironic in the words used by the narrator to describe the Summoner in “The Prologue” to The Canterbury Tales?

    asked on February 1, 2018
  4. math

    A bag contains a markers, 3/8 of which are red. How many other color markers are in the bag?

    asked on April 21, 2017
  5. Language arts

    Which of the following is an example of narrative Non-Fiction A: An autobiography of a dancer B: A bus schedule for Chicago C: An owners manual for a car D: A pamphlet asking people to vote I think it's A... but I'm not sure. Can someone help me?!

    asked on October 15, 2018
  6. Chemistry

    The molar mass of the reagent, Fe(NH4)2(SO4)2.6H2O is 392.14 g/mol. Now suppose the measured mass of Fe(NH4)2(SO4)2.6H2O during the practical was 0.0218 g and this was dissolved in 50ml of deionized water that contains 1 to 2ml of concentrated sulphuric

    asked on November 10, 2015
  7. physics

    An electron is accelerated by a 4.7 kV potential difference. How strong a magnetic field must be experienced by the electron if its path is a circle of radius 8.0 cm?

    asked on April 15, 2009
  8. chemestry

    When 36.5 mL of 0.605 M H2SO4 is added to 36.5 mL of 1.21 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the

    asked on October 23, 2015
  9. chemistry

    Calculate Hrxn for the reaction below. 2 NOCl(g) N2(g) + O2(g) + Cl2(g) You are given the following set of reactions. 1/2 N2(g) + 1/2 O2(g) NO(g) H = 90.30 kJ NO(g) + 1/2 Cl2(g) NOCl(g) H = -38.6 kJ

    asked on October 23, 2015
  10. Government

    Please check my answer~ What is the key difference between a federal government and a confederate government? A.In a federal government, local governments have the most power. In a confederate government, a central government has the most power. B.In a

    asked on September 8, 2016
  11. chemistry

    A mercury mirror forms inside a test tube by the thermal decomposition of mercury(II) oxide. 2 HgO(s) 2 Hg(l) + O2(g) Hrxn = 181.6 kJ (a) How much heat is needed to decompose 556 g of the oxide? (b) If 288 kJ of heat is absorbed, how many grams of mercury

    asked on October 23, 2015
  12. Physics

    A watch manufacturer claims that its watches gain or lose no more than 8 seconds in a year. How accurate is this watch, expressed as a percentage?

    asked on February 1, 2011
  13. Physics

    A certain automobile engine delivers 2.24 ✕ 10^4 W (30.0 hp) to its wheels when moving at a constant speed of 31.0 m/s ( 69 mi/h). What is the resistive force acting on the automobile at that speed?

    asked on September 29, 2014
  14. Chemistry

    calculate the volumes of acetone and ethanol that was used to mix together in order to produce 1 litre (1000ml) of equimolar mixture. helpful notes are, ethanol Mr=46 and a density (20 degrees C)=0.789g/ml, acetone Mr=58 and density (20 degrees

    asked on October 24, 2016
  15. physics

    Two charges, qA and qB, are separated by a distance, d, and exert a force, F, on each other. Analyze Coulomb's law and answer the following questions. What new force will exist if d is cut in half? What new force will exist if qA is tripled and d is

    asked on January 27, 2009
  16. Physics

    A student librarian picks up a 2.2 kg book from the floor to a height of 1.10 m. He carries the book 7.9 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?

    asked on December 15, 2008
  17. physics

    A force of 291.0 N is used to push a 140 kg mass 30.0 m horizontally in 3.00 s. Calculate the power developed in kW.

    asked on December 14, 2008
  18. physics

    A 0.105-kg hockey puck moving at 20 m/s is caught and held by a 77-kg goalie at rest. With what speed does the goalie slide on the ice?

    asked on December 7, 2008
  19. Algebra2

    Complete parts a – c for each quadratic function. a. Find the y-intercept, the equation of the axis of symmetry and the x-coordinate of the vertex. b. Make a table of values that includes the vertex. c. Use this information to graph the function. 1. f(x)

    asked on February 8, 2008
  20. chemistry

    Use the following information to find Hf of butanol [C4H9OH(l)]. C4H9OH(l) + 6 O2(g) 4 CO2(g) + 5 H2O(g) Hcomb = -2712.9 Hf of CO2(g) = -393.5 kJ/mol Hf of H2O(g) = -241.8 kJ/mo

    asked on October 23, 2015
  21. physics

    A(n) 840-kg dragster accelerates on a race track from rest to 85 km/h in 0.90 seconds. (a) What is the change in momentum of the dragster? (b) What is the average force exerted on the dragster? (c) What exerts that force?

    asked on December 3, 2008
  22. Algebra2

    Complete parts a – c for each quadratic function: a. Find the y-intercept, the equation of the axis of symmetry and the x- coordinate of the vertex. b. Make a table of values that includes the vertex. c. Use this information to graph the function. 1.

    asked on February 8, 2008
  23. chemistry

    One piece of copper jewelry at 104°C has exactly twice the mass of another piece, which is at 43.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter (c of copper = 0.387

    asked on October 23, 2015
  24. physics

    A shell is fired from the ground with an initial speed of 1.70 × 10 3 m/s (approximately five times the speed of sound) at an initial angle of 70.0 ◦ to the horizontal. The acceleration of gravity is 9.81 m/s 2 . a) Neglecting air resistance, find

    asked on September 18, 2012
  25. physics

    Small rockets are used to make tiny adjustments in the speeds of satellites. One such rocket has a thrust of 35 N. If it is fired to change the velocity of a 72300 kg spacecraft by 64 cm/s, how long should it be fired?

    asked on December 1, 2008
  26. English

    1. Which of the following is not a type of folktale? (1 point) A. cautionary tale B. mystery** C. legend D. myth Read the following sentence: Some friends from my dance class went to the museum's ballet exhibit. Which of the following is an adjectival

    asked on October 21, 2013
  27. 4th grade

    2578 diveded by4

    asked on March 1, 2010
  28. physics

    Two identical positive charges exert a repulsive force of 6.6 multiplied by 10^-9 N when separated by a distance of 5.8 multiplied by 10^-10 m. Calculate the charge of each.

    asked on January 13, 2009
  29. physics

    A positive charge of q = 2.6 µC is pulled on by two negative charges. As shown below, one, −2.0 µC, is 0.050 m to the north and the other, −4.0 µC, is d = 0.029 m to the south. What total force is exerted on the positive charge?

    asked on January 22, 2009
  30. chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 132 kJ is given off per mole of C2H4 reacting,

    asked on October 23, 2015
  31. chemestry

    27.2 g sample of ethylene glycol, a car radiator coolant, loses 685 J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)?

    asked on October 23, 2015
  32. English

    When an animated cartoon was made of Animal Farm, it was given a happy ending. Animals everywhere hear that Napoleon has betrayed the cause of animalism. They join in a second revolution and succeed in overthrowing him. This leads to the establishment of

    asked on July 30, 2010
  33. Chemistry

    I know I am over thinking this problem like always but none of this makes sense to me for some reason.. KHP was used to determine the concentration of a KOH solution. If 0.78g of KHPwas used and 42.17 ml of KOH was used to titrate it to the endpoint what's

    asked on May 21, 2017
  34. Chemistry

    If a rate of 80.0 mL of an aqueous solution of potassium hydroxide concentration of 0.25 mol / L are partially neutralized by 20.0 mL of an aqueous solution of nitric acid concentration of 0.50 mol L. Determine pH of the final solution. kOH + HNO3 -> H2O +

    asked on January 20, 2016
  35. Chemistry

    al(i) Determine the number of moles of Ca2+ present in the titrated sample. (ii) Determine the [Ca2+] and hence the solubility of CaSO4.2H2O in the original 10.0 mL sample. so

    asked on November 17, 2015
  36. chemistry

    A 30.5 g sample of an alloy at 94.8°C is placed into 52.1 g water at 22.8°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat

    asked on October 23, 2015
  37. physics

    Janet jumps off a high diving platform with a horizontal velocity of 1.84 m/s and lands in the water 2.9 s later. How high is the platform? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m

    asked on September 13, 2012
  38. Geometry

    Which of the following equals (-4) A(-4) . (1-4)

    asked on November 8, 2010
  39. Algebra2

    Simplify: 1.SquareRoot(-144) 2.SquareRoot(-64x^4) 3.SquareRoot(-13)*SquareRoot(-26) 4.(-2i)(-6i)(4i) 5. i^13 6. i3^8 7.(5 – 2i) + (4 + 4i) 8.(3 – 4i) – (1 – 4i) 9.(3 + 4i)(3 – 4i) 10.(6 – 2i)(1 + i) 11. (4i)/(3+i) 12. (10+i)/(4-i) 13. (-5 +

    asked on February 8, 2008
  40. physics

    A pelican flying along a horizontal path drops a fish from a height of 3.1 m. The fi!@#$%^&ravels 6.4 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of

    asked on September 18, 2012
  41. math

    order 3/10 from least to greastest

    asked on September 3, 2012
  42. math

    There were 25 students who completed a survey. There were 11 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

    asked on April 9, 2012
  43. College math

    Please, help me with this problem: frind the derivative of each function at the given number. 21. f(x)= -4x + 5 at 3 22. f(x)= -4 + 3x at 1 thanks

    asked on October 19, 2011
  44. math

    A rectangle has sides of 3x – 4 and 7x + 10. Find the expression that represents its perimeter.

    asked on September 23, 2007
  45. German

    Can someone please check my German? _____ du die Fragen? A.Beantwortest B.Fragtest

    asked on May 24, 2016
  46. physics

    what is heat

    asked on November 12, 2015
  47. physics

    what is diffraction? When does it occur? Which waves will defract more when passing through an opening?

    asked on November 12, 2015
  48. chemistry

    Calculate H0rxn for each of the following using data from Appendix B. (a) 2 H2S(g) + 3 O2(g) 2 SO2(g) + 2 H2O(g) b) CH4(g) + Cl2(g) CCl4(l) + HCl(g) [unbalanced]

    asked on October 23, 2015
  49. math

    convert to fraction: 8.714285714285714285...(the 714285 is repeating.

    asked on August 25, 2015
  50. math (6 grade)

    What are objects that are between 5 centimeters to 8 centimeters long?

    asked on January 20, 2013
  51. Physics

    The nucleus of an atom has a charge of 65 protons. (a) What are the direction and magnitude of the electric field at 4.9 x 10^-10 m from the nucleus?

    asked on February 8, 2009
  52. novel

    In tale of two cities please answer these questions in chapters 11,12,13: 1-why did darnay decided to go back to paris? 2-"in the name of that sharp female born and called la guillotine why did you come to france" who said these words?to who and when?

    asked on February 24, 2008
  53. Science

    Do all cells in a person have the same banding pattern?

    asked on February 19, 2018
  54. Math

    How to do the coffee shop has nine pies

    asked on September 22, 2016
  55. Math

    How do you solve it in pictures

    asked on September 22, 2016
  56. chemistry

    calculate the ph of a solution that is 0.111 M HCI(strong solution)

    asked on May 4, 2016
  57. Chemistry

    A 10.0 mL sample of supernatant liquid from the system described by equation 1 was titrated with 0.01022 M EDTA solution to an end-point at 16.90 mL. Titration of the blank gave a titre (end-point) at 1.45 mL. Determine the titration volume required to

    asked on November 17, 2015
  58. chemestry

    What is the enthalpy change when 24.0 g of water is cooled from 40.0°C to 5.70°C? _________kJIs the process endothermic or exothermic?

    asked on October 23, 2015
  59. math

    rationalize the numerator: ((square root of m)-(square root of 7))/(7-x). thank you so much

    asked on August 25, 2015
  60. chemistry

    If 5.0 mL of 0.12 mmol dm-3 MB solution is diluted by adding 20.0 mL of 0.2 mol dm-3 HCl to it, what is the new MB concentration?

    asked on April 26, 2015
  61. mathes

    how do calculate this 55 divided by 3500

    asked on April 18, 2014
  62. question

    if you have a chance of 1 out of 60 of your baby having down syndrome is it bad?

    asked on July 24, 2012
  63. algebra

    I need help solving and graphing the equation. y= -7+3

    asked on January 27, 2011
  64. physics

    a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?

    asked on January 5, 2011
  65. physics

    a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?

    asked on January 5, 2011
  66. 5th grade

    the lengths of two sides of a triangle are 15 inches each and the third side measures 10 inches what kind of triangle is that

    asked on November 11, 2010
  67. 10th grade

    How do I answer and graph this problem 4x + 3y = 4

    asked on October 27, 2010
  68. History/ Need fast help

    What were some of political issues that was dealt in the Gilded age? What is the current political issues that is faced today? Are they Similar or different? Explain.

    asked on April 14, 2010
  69. U.S. History

    To what extent would it be accurate to say that New England, Middle, and Southern Colonies had merged to create a single American Society by the end of the French and Indian War?

    asked on September 7, 2009
  70. physics

    A 16.0 ohm and a 24.0 ohm resistor are connected in parallel. A difference in potential of 32.0 V is applied to the combination. What is the equivalent resistance of the parallel circuit? What is the total current in the circuit?

    asked on February 25, 2009
  71. physics

    A 16.0 ohm and a 24.0 ohm resistor are connected in parallel. A difference in potential of 32.0 V is applied to the combination. What is the equivalent resistance of the parallel circuit? What is the total current in the circuit?

    asked on February 25, 2009
  1. Msth

    Kattie80 is right for the 4 question quiz EXCEPT for #4. She said it was 15 or D. She meant 15 or C. Hope this helps

    posted on November 8, 2018
  2. Science

     Phloem actively transports sugars into a part of the phloem called sieve tubes. This active transport (called translocation) requires the cells to do work and use energy and can only be done while alive. Xylem cells on the other hand transport water by

    posted on February 5, 2018
  3. Math


    posted on October 22, 2017
  4. Math

    I don't know the answer to this question. Please help

    posted on January 23, 2017
  5. Math

    A square is cut in half on the diagonal, creating two equal triangles.each triangle has an area of 0.32 square units. What is the lenth, in units, of the original square. HELP ME PLEASEE

    posted on April 28, 2016
  6. physics

    i did and i still don't understand

    posted on November 12, 2015
  7. physics

    ive tried google its all confusing

    posted on November 12, 2015
  8. Chemistry

    Thank you for all your help.

    posted on November 10, 2015
  9. Chemistry

    The mass of the compound is 0.0218g and if I calculate the mass of Fe I get a mass of 0.31g which is more than the mass of the whole compound.

    posted on November 10, 2015
  10. Chemistry

    DRBob222 what do you mean when you say That is done by 0.218 x (atomic [mass Fe/molar mass Fe(NH4)2(SO4)2.6H2O]*100 = ? Could you please explain further?

    posted on November 10, 2015
  11. Math

    i have no idea help

    posted on September 9, 2015
  12. math help

    still don't really quite understand. could you explain your process a bit more?

    posted on August 25, 2015
  13. Math

    Hey! multiply both the numerator and denominator by the conjugate. in this case it's square root a - square root b.

    posted on August 25, 2015
  14. Chemistry


    posted on May 7, 2015
  15. chemistry

    Thank You

    posted on April 27, 2015
  16. chemistry

    methylene blue

    posted on April 26, 2015
  17. fractions

    what fractions are used for 96 cupcakes

    posted on October 8, 2014
  18. 4th grade

    Terrance describes the amount of money made based on the number of hours worked by the function rule y=10h. Given this function, how much money does Terrance earn for each hour worked?

    posted on January 28, 2014
  19. English

    @Ms.Sue Please check 1.B 2.D 3.A

    posted on October 21, 2013
  20. English

    is 3 A

    posted on October 21, 2013
  21. English

    Well then lol could you help me?

    posted on October 21, 2013
  22. Art Please check answers

    Ok were they all right or not very important

    posted on June 2, 2013
  23. question

    oh ok thankyou

    posted on July 24, 2012
  24. algebra rebus puzzle

    negative slope

    posted on May 22, 2012
  25. pyhsics

    I'm actually trying to do this problem right now. I'm a bit stuck on the second part. How do you find the speed of the object at t = 2.0s? Every kinematic equation I've tried to use requires acceleration, and I can't find acceleration with having the final

    posted on March 31, 2011
  26. 8th grade science

    lol i need help so you guys are soooo dumb

    posted on February 27, 2011
  27. reading

    what is the conflict,rising action,and climax in the face on the milk carton

    posted on February 22, 2011
  28. english

    I surpose you could ask: Why did you become an English teacher? Where did you study to become a teacher? Why did you decide to teach? Is teaching English diffecult? Do you regret you choice to teach? What's your favourite book?

    posted on July 30, 2010