1. science

    A certain mass of water gains 1,673 J of thermal energy when it's temperature increases by 2.0 degrees Celsius. What is the mass of the water?

    asked by Mary on November 11, 2014
  2. calculus(work)

    a rectangular water tank has a length 20 ft, width 10 ft , and depth 15 ft . if the tank is full , how much work does it take to pump all the water out (using calculus)?

    asked by tony on April 2, 2011
  3. physics

    Water waves in a lake travel 5.23 m in 1.52 s. The period of oscillation is 0.84 s. What is the speed of the water waves? Answer in units of m/s. what is the wavelength?

    asked by josh on March 17, 2015
  4. Physics

    An outdoor swimming pool contains 100000 kilogram of water how much energy is needed yo heat water from 15 celius to 20 celius

    asked by Anonymous on March 2, 2015
  5. Math

    write an inequality representing the temperature t of the ocean water during the formation of the hurricane if the ocean water is above 80 degrees farenheit

    asked by Angelina on March 9, 2015
  6. Math -Calculus

    A cylinder with radius of 20 ft is being filled with water at a rate of 2000 ft^3/hour. Find the rate at which the height of the water is increasing.

    asked by Puja on November 20, 2012
  7. math

    the building supply store sells one liter bottles of water for $1.09 approximately how many 8 ounce servings of water in 1 liter

    asked by chris on July 11, 2016
  8. Physics

    If an oil tank that if 15ft tall which is holding oil and water, the water being 8 ft, how much pressure will have when I is opened and begins to flow?

    asked by Melissa on November 28, 2014
  9. Chemistry

    What volume of water would be required to dissolve 1 g of BaF2? mass of BaF2 is 1.31 g and it dissolves in 1 L of water. The answer is 0.763. Can someone please explain how they got this?

    asked by Kev on June 11, 2011
  10. Math

    Hank's fish bowl holds 9/10 gallon of water. It is now 2/3 full. How much water is in the bowl? I subtracted and my answer is 7/30. Is this correct?

    asked by Alice on March 4, 2015
  11. Physics

    Why is it that when water is in a bucket and spinning around in a circular motion and then upside down the water in the bucket does not move or spill? Am not sure on what terms to use to explain why this happens

    asked by Angie on November 5, 2009
  12. Chemistry

    The following reaction represents the decomposition for water: 2H2O - 2H + O How many molecules of hydrogen are produced from the decomposition of 12.2 grams of water into its elements?

    asked by Stacey on March 26, 2010
  13. Physics

    A 755 N diver is standing on a platform 10.0 m above the surface of the water. What is the diver's speed when he hits the water? (disregard friction)

    asked by Einna on February 28, 2015
  14. college

    a 200 L electric water heater uses 15 kW of electric power. If the herter is 90% efficient, how long does it take to heat the water in the tank from 16 C to 61 C?

    asked by Bill on December 18, 2009
  15. General Science

    Would you expect to find more dissolved oxygen in ocean water around the North Pole or in ocean water nearer the equator?Why?

    asked by Jen on February 20, 2008
  16. Physics

    What would the gauge pressure be on a diver in atmospheres if she could dive to a depth of one km in sea water? One atmosphere is 1.01 X 10^5 N/m2. The density of sea water is 1.03 X 10^3 kg/m3.

    asked by Alex on December 1, 2010
  17. Chemistry

    12.00 g of sugar is dissolved in some water in a cylinder of diameter 7.00 cm. To what height should the cylinder be filled (with more water) to produce a solution with concentration 11.00 g/dm^3?

    asked by Henry on January 20, 2011
  18. physics

    A fountain sends water to a height of 149 m. What is the difference between the pressure of the water just before it is released upward and the atmospheric pressure?

    asked by melisa on October 25, 2011
  19. math

    a cylindrical tank with diameter 2.0m and height 3.2m is to be filled with water. how many litres of water are needed to fill the tank? 100cm3 = 1L

    asked by laf on January 13, 2013
  20. physics

    Five identical resistors, each of resistance R, are connected in series to a battery, and a total current of 9.74 A flows in the circuit. i. Now, another resistor of resistance R is added to the circuit, in series with the rest of the resistors. Find the

    asked by kelly on October 9, 2014
  21. chemistry

    If the atmospheric pressure is not corrected for vapor pressure of water, what effect will this have on number of moles of oxygen calculated? Use numbers from your experiment and determine the percent deviation caused by this omission. Is this a

    asked by Anonymous on September 3, 2010
  22. Physics

    A 50kg by runs up the steps to the third floor of height 10.5m in 45s.While at the third floor,the boy drops a 0.25kg ball and strike the ground 1)Calculate the rate of work done. 2)By using work-energy theorem,calculate the speed of the ball just before

    asked by Anonymous on October 4, 2017
  23. statistics

    In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: Fifteen (15) lung cancer deaths occurred among

    asked by DANIELLE on April 10, 2008
  24. statistics

    In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: • Fifteen (15) lung cancer deaths occurred

    asked by DANIELLE on April 10, 2008
  25. Chemistry

    A 67gr mass of solid iron is heated by a flame until the temp of the iron equals the temp of the flame. The solid iron is then dropped into 250gr of liquid water at 26 degrees C. After 5 mins, the iron and the water are both at 47 degrees C. Specific heat:

    asked by Lacey on March 31, 2009
  26. Science

    1. Use the image below to answer the following question. An image shows a diver crouching on a diving board labeled 1. The diver launching off the board is labeled 2. The diver just about to enter the water is labeled 3 The diver in the water feet above

    asked by Luna on December 6, 2018
  27. geometry.

    use midpoint formula to calculate the midpoint of AB. Name it point M and plot it in the graph. Calculate lengths AB, AM, MB. thanks for help.

    asked by robin on April 6, 2015
  28. Physical Science

    How do you calculate the mass and volume of an irregular solid object and calculate the density of that object?

    asked by Alex on January 26, 2009
  29. Math - Probability Statistics

    P(E)=.4, P(F)=.5 and P(E[intersect]F)=.1 , Calculate P(F|E)=? Using conditional probability, I got .2 as the answer, using: P(E[interstect F)/P(F) = .1/.5 = .2 Calculate P(E|F) is .25 using: P(E[intersect F)/P(E) = .1/.4 =.25 Is this now correct?

    asked by Dee on August 31, 2009
  30. geometry

    In the following figure given a circle C(o,3) Bp=AB and BA^N = 30 a) Calculate AP,BN and AN b)Calculate AQ and BQ c) Show That M is the mid point of (AP) d)Show that (OM)is perpendicular to (A)

    asked by Nour on April 16, 2010
  31. chemistry

    % recovery: how do i calculate it? we're doing a recrystallization in chem class we used 0.1 g and we recovered 0.3 g how do i calculate the percent recovery?

    asked by jessie on February 9, 2011
  32. chemistry - decomposition of water(help)

    Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of

    asked by Farah on March 3, 2011
  33. chemistry - decomposition of water(help)

    Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of

    asked by Farah on March 3, 2011
  34. Chemistry

    At 298 K, deltaGo = - 6.36 kJ for the reaction: 2N2O(g) + 3O2(g) ↔ 2N2O4(g) Calculate deltaG (in kJ) at 298 K when PN2O = 3.12 atm, PO2 = 0.0081 atm, and PN2O4= 0.515 Calculate deltaG (in kJ) at 298 K for some solid ZnF2, 0.025 M Zn2+ and 0.038 M F-(aq).

    asked by Anonymous on April 3, 2013
  35. Physics

    The archerfish hunts by dislodging an unsuspecting insect from its resting place with a stream of water expelled from the fish's mouth. Suppose the archerfish squirts water with a speed of 2.45 m/s at an angle of 53.0 degrees above the horizontal, and aims

    asked by Leah on September 15, 2009
  36. English

    Can you check these sentences about summer holidays? Thank you. 1) When I was at the seaside, I usually bathed twice in the mornings. (went for swims). 2) I pushed my child on a swing and I watch him going on a slide. When I was at the swimming pool, I

    asked by Henry2 on September 12, 2011
  37. earth science

    Which item in the list below is most responsible for storm surge during a hurricane? A. Water mounding caused by a hurricane's low pressure center B. The strong horizontal surface winds in the hurricane push water ashore C. Heavy precipitation in the

    asked by Alz on October 1, 2018
  38. Chemistry

    So we're doing oxidation-reduction reactions and batteries and voltages. We did a lab where we would take two metals, put it in a mixture (bleach/water/vinegar/salt) and used a voltmeter to see the DC voltage. Now we're supposed to 'calculate the potential

    asked by Ari on May 5, 2013
  39. College Chem

    A 1000 g sample of metal with a specific heat of 0.50 J/goC is heated to 100.0oC and then placed in a 50.0 g sample of water at 20.0oC. (Hint: Specific heat of water at 20.0oC is 4.182 J/goC). What is the final temperature of the metal and the water? Write

    asked by nia on February 18, 2017
  40. physics

    a mercury column in a simple barometer at a height of 75.9cm. An amount of pure water is introduced into the barometer column and form a 1.20cm layer on top of mercury. The mercury column now stand at height of 78.08cm . what is the pressure in the space

    asked by temi on June 22, 2018
  41. Physics

    A hostess wants to cool her 100g of soup which is currently at 50Celsius, and it's specific heat is 0.8 cal/g celsius, by adding water (specific heat = 1 cal/ g celsius) at a temperature of 5Celsius, how much water should she add, assuming that all the

    asked by Mad on March 2, 2016
  42. Physics

    i'm really lost here. please show me how to solve this A 0.10 kg piece of copper at an initial temperature of 94 degrees C is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The water and calorimeter are initially at 15 degrees

    asked by teamjakeward on February 15, 2009
  43. chemistry

    Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3·x H2O, where x is the number of moles of

    asked by allison on May 16, 2012
  44. chemistry

    Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3·x H2O, where x is the number of moles of

    asked by allison on May 16, 2012
  45. chemistry

    A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound? Below is what I tried, but don't know what to do next. Please

    asked by Anonymous on October 11, 2013
  46. chemistry

    A student determined the chloride content of a commercial salt by using the Mohr method. A 0.5324 -g sample of the salt was dissolved in distilled water and diluted to a final volume of 250. mL. A 25.-mL aliquot of the analyte solution was then titrated

    asked by tara on April 4, 2011
  47. physics

    Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest known spot in the Earth's oceans, at 10.922 km below sea level. Taking density of seawater at atmospheric pressure (p0 = 101.3 kPa) to be 1024 kg/m3 and its bulk modulus to be B(p)

    asked by Anonymous on April 16, 2011
  48. Physics

    1. Calculate the kinetic energy of a 5.2kg object moving at 2.4 m/s 7. Calculate the potential energy of a 5.2kg object positioned 5.8m above the ground 21. Calculate the speed of a 5.2 kg object that possesses 26.1 J of kinetic energy.

    asked by Mary on February 13, 2017
  49. chemistry

    Given that the specific heat capacities of ice and steam are 2.06 J/g degrees celsius and 2.03 J/g degrees celsius, respectively, and considering the information about water given, calculate the total quantity of heat evolved when 10.0g of steam at

    asked by Anonymous on April 16, 2012
  50. physics

    An open vertical tube is filled with water and a tuning fork vibrates over the top near the open end. As the water level is lowered in the tube, the first resonance is heard when the water level is at 31 cm from the top of the tube. What is the frequency

    asked by Leslie on September 6, 2011
  51. pr calc 11

    The path of the stream of water coming out of a fire hose can be approximated using function h(x0=-0.09x^2+x+1.2=0, where h is the height of the water stream and x is the horizontal distance from the fire-fighter holding the nozzle in metres. At what

    asked by AMANSANDHUWILLDIE!!! on April 1, 2016
  52. Physics

    You are working as a summer intern for the Illinois Department of Natural Resources (DNR) and are assigned to some initial work on water resources project. The department will be overseeing the construction of a dam to create a large fresh water lake that

    asked by jesse on May 1, 2010
  53. chemistry

    what mass of AgBr is produced when 100.0 mL of 0.150 M AgNO3 is added to 20.0 mL of 1.00 M NaBr?

    asked by paul on January 27, 2015
  54. Chem

    What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

    asked by IH on November 29, 2010
  55. Math

    isn't 3 added to 5, 5 + 3? i know it doesn't matter, but when it sais to multiply the first number, i must know wether it's 3 or 5.

    asked by Ricky on January 23, 2008
  56. science

    when phenolphthalein is added to ammonium hydroxide the color of the final solution is pink?

    asked by kleanface on October 31, 2012
  57. chemistry

    How many milliliters of 0.246 M HNO3 should be added to 213 mL of 0.00666M 2,2'-bipyridine to give a pH of 4.19?

    asked by amit on May 26, 2010
  58. science

    if .38 kJ of heat is added to 19.6 grams of ice at -12.0 degrees celsius, what will be the final temperature?

    asked by Sydney on January 10, 2015
  59. Algebra 1

    What value could be added to 2/15 to make the sum greater than 1/2. A. 1/15 B. 8/30 C. 5/15 D. 8/15 2. Which set of mixed numbers had a difference less than 1?

    asked by Malcolm on September 24, 2015
  60. math

    What value could be added to 2/15 to make the sum greater than 1/2. A. 1/15 B. 8/30 C. 5/15 D. 8/15 2. Which set of mixed numbers had a difference less than 1? A. 1 2/9,1 1/9 B. 3 4/7,2 1/7 C. 2 4/5,1 1/3 D. 2 7/9,1 1/3 1. A 2. A Thanks

    asked by Skylar on September 14, 2015
  61. math help me please!!!!!!!!!!!!!!!!

    luke added 429+699+314 and got 950 is this sum reasonable?

    asked by esha on October 18, 2011
  62. chemistry-organic

    what happens when sodium benzoate is added to dichloromethane? what is the organic and aqueous layer of this product?

    asked by Nancy on April 1, 2009
  63. Chemistry

    3.5 liters of H2O are added to 500 mL of a 2.0 M HNO3 solution. What is the resulting molarity?

    asked by Riley on March 26, 2010
  64. AP Chemistry

    To have a buffer with a pH of 2.50, what volume of 0.510 M NaOH must be added to 100. mL of 0.230M H3PO4?

    asked by Shannon on March 16, 2015
  65. Chem

    What is the percent by mass of a solution if 45 grams of acetic acid is added to 90 g of H2O? Thanks.

    asked by Jenny on March 21, 2011
  66. Graph Theory

    Let S be a sequence of exactly one positive integers, n. what is the least number of 1s needed to be added to make it graphical?

    asked by Bruce on October 29, 2016
  67. Chemistry: Salt of weak acids and bases

    If 25 mL of 0.20M NaOH is added to 20 mL of 0.25M boric acid, what is the pH of the resultant solution?

    asked by Wen on April 10, 2016
  68. home insurance

    The U.S congress added disability insurance to the social security act in 19___. A.35 B.54 C.65 D.72 i got A

    asked by Ciara on October 18, 2011
  69. analytical chemistry

    How much ammonium sulfate should be added to 500mL of .30M ammonia to make a buffer with a pH 9.0?

    asked by joey on November 20, 2010
  70. Chemistry

    how many grams of potassium hydroxide would need to be added to 400 mL of 0.150M HNO3 to raise its pH to 2.5

    asked by Ruth on March 17, 2015
  71. science: chemistry

    How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa

    asked by Julie on July 23, 2015
  72. finace

    How much total interest would Justin pay over the seven years, and what would be a justification for this added cost

    asked by hakeem on August 17, 2015
  73. General Chemistry

    How many milliliters of 0.5M NaOH must be added to 200 mL of 0.1M NaH2PO4 to make a buffer solution with a pH of 6.9?

    asked by Joanna on January 31, 2013
  74. Chem

    What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

    asked by IH on November 29, 2010
  75. Algebra

    X/3 - 10 = -12 I need help on this... I got half of it done. I added ten to both sides and got X/3 = -2 I’m stuck on this part. Can someone help me and explain the process? Thanks.

    asked by Maths person on February 1, 2018
  76. Math

    What is the final price of a textbook that costs $107.20 with an added tax rate of 6%?

    asked by Leah on February 5, 2016
  77. Science

    Why does a toy car go faster and further when it is added weight onto it and is put on a ramp at 45 degrees?

    asked by Megan on September 25, 2011
  78. math

    Find all pairs of numbers such that when they are added they equal 100, and when they are multiplied they are at least 2000.

    asked by Omar on February 13, 2013
  79. home economics

    How many eggs should be added in to a standard chocolate cake recipe? :) k cool thankss

    asked by Emileebabee on April 15, 2011
  80. chemistry

    How many liters of 0.50M NaOH must be added to 125 mL of 0.75M HCL to neutralize it

    asked by KJ on May 20, 2013
  81. math test review

    7. Given that w=7r+6r+5r+4r+3r. Which of the terms listed below may be added to w to the resulting sum will be divisible by 7 for every positive integer r? A.7r B.6r C.5r D.4r E.3r

    asked by vincent on August 6, 2014
  82. science

    To an element x(at.no=70)y(at.no=120)is added,if the ratio of atoms should be 1:10E7,then how many gr of y is required to 100gr of x?

    asked by Komali on August 2, 2011
  83. chemistry

    how is the endpoint estimated using potentiometric if no chemical indicator is added to the analyte solution?

    asked by e on March 3, 2008
  84. math

    write the algebraic equation for "after 7 is added to a number, the sum is divided by 4 and the result is 12"

    asked by ji on May 14, 2013
  85. chemistry

    To 50 mL of this buffer, 10.0 mL 0.76 M soium hydroxide was added, what is the pH of the resulting solution after equilibrium has been re-established

    asked by cel on June 15, 2014
  86. Chemistry

    What would happen to the color of a dilute solution containing FeCL4 if you added concentrated HCl?

    asked by Christina on April 27, 2010
  87. algebra

    $16 added to an amount of money saved,s, then spent equally on 3 items what does the expression mean?

    asked by Bobby on September 20, 2012
  88. physical science

    what is the freezing point depression when 153g of bromide is added to 1000g of benzene?

    asked by melanie on August 19, 2011
  89. physical science

    what is the freezing point depression when 153g of bromine is added to 1000g of benzene?

    asked by melanie on August 19, 2011
  90. AP Chem

    What is the ph of a .05 L solution containing .075 mol NH3 and 6.80 g of NH4+ when .025 L of 2 M is added to it? Kb= 1.8 x10^-5

    asked by Lola on March 9, 2015
  91. Math

    I need to make a formula showing that I added 100 to the 99th Triangular Number.. Anyone know how I can do that?

    asked by Bob on January 31, 2008
  92. Chemistry

    What is the [CrO4] in a 2.5 L saturated solution of lead (II) chromate to which 0.05 mol Pb(NO3)2 is added?

    asked by Josh on April 29, 2012
  93. Chemistry

    What is the pH of a one liter auqueous solution to which has been added 0.2 moles of acetic acid (CH3COOH)?

    asked by Chris on January 23, 2011
  94. Chemistry

    CO(h20)6 2+ + 4Cl- CoCl4 2- + 6H20 What would AgNO3 do when added to this? What is the equilibrium expression?

    asked by Kharris on March 9, 2010
  95. Chemistry

    CO(h20)6 2+ + 4Cl- CoCl4 2- + 6H20 What would AgNO3 do when added to this? What is the equilibrium expression?

    asked by Kharris on March 9, 2010
  96. math

    If 6 is added to the numerator and denominator of the fraction 7/9,what will be the value increase or decrease ?by how much ?i need solution answer

    asked by sheirra on September 17, 2016
  97. chemistry

    Which of the following is a possible set of n, l, ml, and ms quantum numbers for the last electron added to form an As3+ ion? (a) 3, 1, -1, ½ (b) 4, 0, 0, -½ (c) 3, 2, 0, ½ (d) 4, 1, -1, ½ (e) 5, 0, 0, ½

    asked by bob segar on September 29, 2011
  98. Chemistry

    What volume (mL) of .20 M HCL needs to be added to 1.23 L of .10 M acetic acid to reduce percent ionization to 1.00%?

    asked by Molly on March 3, 2015
  99. history

    What books are collected in the Hebrew? The Torah, the Prophets, and Writings that were added later. Is this accurate?

    asked by Reed on October 7, 2010
  100. Math

    What is the final price of a $24 sweatshirt if there is a 20% discount applied and then a 7% sales tax added?

    asked by Julie on February 6, 2016