1. Chem

    Given that 277J of heat are absorbed when 1.12g of sodium nitrate are dissolved in water, calculate the heat of reaction.

    asked by Shirley on July 15, 2012
  2. physics

    A 225-kg box is pushed horizontally with a force of 620N. If the coefficient of friction is 0.20, calculate the acceleration of the box.

    asked by john on April 23, 2014
  3. statistics

    Calculate SS, variance, and standard deviation for the following population of N _ 7 scores: 8, 1, 4, 3, 5, 3, 4. (Note: The definitional formula works well with these scores.)

    asked by Liz on June 22, 2011
  4. paul

    A stock will provide a rate of return of either –20% or +28% . 1. If both possibilities are equally likely, calculate the expected return and standard deviation.

    asked by john on April 23, 2010
  5. statistics

    Calculate SS, variance, and standard deviation for the following sample of n _ 4 scores: 3, 1, 1, 1. (Note: The computational formula works well with these scores.)

    asked by Liz on June 22, 2011
  6. Science

    A pump is used to lift 500 kg of water from a depth of 80 m in 10 seconds.Calculate the power rating of the pump if it's efficiency is 40% . Take g=10 m/ s*s.

    asked by Swati on February 7, 2017
  7. science

    An automobile is pulled by a horizontal tow line, with a force of 900 N. If its acceleration is 1.0 m/s2, calculate the mass of the automobile.

    asked by tash on January 30, 2013
  8. chemistry

    How do you calculate deltaHf using the # of moles from a balanced equation? How do you connect the Law of Conservation of Energy to a Thermochemical Equation? Thanks so much!

    asked by K on April 29, 2013
  9. science

    Calculate the EMF of the cell CR|Cr3+(0.1M)||Fe2+(0.1M)|Fe Cell reaction- 2Cr(s)+3Fe2+(aq)->2Cr3+(aq)+3Fe(s)

    asked by Rasilu on April 26, 2016
  10. maths /science

    A body calling from rest has a velocity of 25m/s at given instant. Calculate 1 the distance the body has fallen 2 the time taken

    asked by christina on September 28, 2016
  11. physics

    A 250-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.

    asked by das on October 18, 2010
  12. chemistry

    a. Determine the density of a cube of copper with a length of 5.00 cm and a mass of 1,112.50 g. b. Calculate the number of atoms in the cube

    asked by Mike on July 20, 2014
  13. math

    the total surface of rectangular solid is 130cm^2 .if the solid is 7cm long nd 5cmwide. calculate the height

    asked by timi on May 9, 2019
  14. Chem

    A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 4.3cm . Its mass is 1.2kg . Calculate the density of the metal.

    asked by Cf on September 16, 2013
  15. chemistry

    Help me solve it. Step by step please The value of kp at 20°c for the reaction 2NO(g) +Cl2(g) 2NOCl(g) is 1.9x10^3 atm-1 calculate the value of KC at the same temperature.

    asked by john on December 6, 2015
  16. math

    Andrew borrows $79,500 for 5 months on 6.30% interest rate in his saving account. Calculate the simple interest?

    asked by Anonymous on April 2, 2014
  17. chemistry

    When irradiated with a radiation of wavelength 58.4 nm the electron of H atom was ejected with kinetic energy 7.6 eV. Calculate the ionization energy.

    asked by kamila t arakkal on April 26, 2016
  18. engineering

    If faucet is dripping at a rate of one drop per second and each drop contains 0.150 milliliters. Calculate how much water will be lost in 1 year.

    asked by Maria on January 14, 2011
  19. physics

    calculate the total pressure at an ocean depth of 6000 m (the depth at which the wreck of the titanic was found) in both pascals & lb/in^2

    asked by john on March 20, 2010
  20. Physics

    d1 = 2.53 cm +/- .05 cm d2 = 1.753 m +/- .001 m 0 = 23.5 degrees +/- .5 degrees v1 = 1.55 m/s +/- .15 m/s Using the measured quantities above, calculate the following. Express the uncertainty calculated value. d1 (tan (0))

    asked by Joy on November 11, 2013
  21. Chemistry

    Calculate the longest wavelength of light that can break a H-O bond. The bond enthalpy of formation is 463 kj/mol

    asked by Angelina on April 8, 2011
  22. chemistry

    Calculate the energy in joules per photon of red light having a wavelength 655 nm. What is the energy of 1 mol of these photons?

    asked by ashley b on June 23, 2011
  23. Calculus (Motion with Vector functions)

    1. What are the magnitude and direction angle for the vector u= 2. Calculate the speed of a particle in the xy-plane with positive vector r(t)=(4-t^2, 6t) at the point (0,12).

    asked by Angela on January 22, 2018
  24. Science

    A projectile has a range of 50m and reaches a maximum height of 10m. Calculate the angle at which the projectile is fired.

    asked by Gash on February 6, 2019
  25. Chem

    A block of metal has a width of 3.2 cm , a length of 17.1 cm , and height of 5.2cm . Its mass is 1.2kg . Calculate the density of the metal

    asked by Jillian on September 12, 2013
  26. physics

    The surface area and the average depth of the Pacific Ocean are 1.8 x 10 8 km 2 and 3.9 x 10 3 m, respectively. Calculate the volume of water in the ocean in liters.

    asked by Latrese on September 25, 2011
  27. chemistry

    QUESTION 9 The number of moles of the reagent in excess can be used to calculate the moles of the products of the reaction. TRUE FALSE

    asked by Anonymous on July 11, 2016
  28. chemistry

    The heat of vaporization of bromine at its boiling point (59.6 °C) at 1.00 atm is 29.54 kJ/mol. Calculate the vapor pressure of bromine at 37.8 °C.

    asked by WLP on January 22, 2012
  29. Chemistry

    Calculate the mass percent composition of carbon in each the following carbon compounds. C2H2 C3H6 C2H6 C2H6O

    asked by Amee on March 4, 2013
  30. SS

    How often do banks calculate interests on accounts with simple interest? daily weekly monthly yearly yearly?

    asked by Anonymous on January 31, 2014
  31. Biochemistry

    Two molecules of DNA are the same size, but differ in base composition. One molecule contains 20 % (A + T) while the other contains 60 % (A + T). Which molecule has the higher T m? Why?(The m is a subscript of T) I'm not sure what T m is..or how to

    asked by student on September 17, 2009
  32. Physics

    Four equal charges Q=2*10^-8coulumb are placed at the corners of a square of side 60cm.calculate the potential at the centre of the square.

    asked by Ayodele on April 8, 2010
  33. Chemistry

    Given that KH for CO gas at 25 OC is 9.71 x10-4 mol.L-1.atm-1. Calculate the mass of CO that would dissolve in 1.00 L of H2O if the partial pressure of CO is 1.38 atm.

    asked by Chelsea on February 15, 2011
  34. geography

    Calculate the gradient of a road (4km) intervals from a given roundabout the different height between the two end point the road is 400mm?

    asked by jamilu abubakar sadiq on April 23, 2016
  35. Chemistry

    calculate the bond energy for diatomic oxygen O2 given that standard enthalpy of atomization of oxygen (ΔH) = 249.17KJ

    asked by Solomon on February 29, 2016
  36. Chemistry

    A 0.22-caliber handgun fires a 27-{\rm g} bullet at a velocity of 765 {\rm m}/{\rm s}. Part A Calculate the de Broglie wavelength of the bullet.

    asked by Anonymous on June 30, 2012
  37. Statistics(Please check)

    calculate the probability of the following: A four, three, or spade from a single draw from a 52 card deck. there are 4 4's so 4/52, 4 3's so 4/52 and then 13/52 spades so 21/52 but and one 4 and one 3 are from spades so minus 2 = 19/52 Is this correct?

    asked by Hannah on July 23, 2011
  38. Please Help! Calculus

    Calculate the speed of a particle traveling in the xy-plane with position vector r(t)=(4-t^2,6t) at the point (0,12). a)2(sqrt13) b)6 c)4(sqrt13) d)52 e)sqrt2

    asked by Tony on January 22, 2018
  39. chemistry

    calculate the specific heat (j/g C ) for each of the following: -an 18.5-g sample of tin that absorbs 183 J when its temperature inceases from 35.0 degrees C to 78.6 degrees C

    asked by kelly on September 14, 2010
  40. physic

    Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 4.5000 kg when weighed in air.

    asked by Ash on August 8, 2010
  41. physics

    A reistance thermometer has a resistance of 20w at 0°c and 85w at 100°c if it resistance is 52w in medium calculate the corresponding temperature?

    asked by poppy on April 26, 2019
  42. physics

    the mass of the boy is 70kg. calculate the force in newtons acting on the boy due to his deceleration. how do i work this out

    asked by evie on March 31, 2012
  43. chemistry

    Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 4 state to the n = 3 state.

    asked by Tanisha on March 23, 2010
  44. maths

    The diagonal of a parallelogram 6cm and 8cm long and they intersect at an angle of 55 degrees. calculate the area of the parallelogram

    asked by Riliwan on November 22, 2016
  45. statistics

    the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

    asked by skitter on November 29, 2010
  46. Physics

    A car moves along a circular track at 60 kmph. If the radius of the track is 300 m, calculate the acceleration towards the centre

    asked by Aditya on August 11, 2011
  47. Chemistry

    Calculate the pH when 39.0mL of 0.321 of HA is mixed with 39.0mL of 0.321M NaOH where HA is a monoprotic weak acid with Ka= 7.5x10^-5 M ?

    asked by Jematormal91 on March 24, 2012
  48. chemistry

    A system performs 120J work with no heat supplied to it. Calculate the change in internal energy of the system.

    asked by jaycab on January 23, 2011
  49. Physics

    Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate the net force on the left charge due to the other two.

    asked by Mary on January 31, 2015
  50. Chem.

    N2+3H2 2NH3, The equilibrium constant for the chemical equation is Kp = 0.143 at 225 °C. Calculate the value of the Kc for the reaction at 225 °C.

    asked by Anonymous!! on March 19, 2014
  51. Physics

    Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 1.6000kg when weighed in air.

    asked by Melissa on November 10, 2012
  52. Chemistry - equm acid base

    Calculate [H3O+] 0.100 M NaNO2 and 5.00×10−2 M HNO2 so there's no Ka value for NaNO2, it can be ignored 5.6x10^-4 = x^2 / 5.00x10^-2 x = 5.3x10^-3 the answer is incorrect why? Thanks

    asked by X on March 8, 2018
  53. Statistics

    1. Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the z-score for x =72.7 from a sample of size 45. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?

    asked by jane on October 25, 2011
  54. community umuokpu. Chemistry

    if 50cm3 of co3 were put in 40cm3 of O2. Determine the gas that would be in excess and calculate the volume of gas that would be unused

    asked by Tessy on February 9, 2013
  55. finance

    You purchase a stock at a price of $73, and a year later the price increases to $85. You also received a dividend of $2.50. Calculate the rate of return.

    asked by Anonymous on August 1, 2011
  56. chemistry

    Trying to calculate atoms of O in 2.00 moles of H3PO4.I used 2.00 mol h3po4÷4atoms O then × by 6.022 avrogados# My answer 3.011×10^23

    asked by jackson on March 25, 2015
  57. stats - URGENT!!!!

    the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

    asked by skitter on November 30, 2010
  58. algebra

    you invest $2800 in an account that pays an interest of 5.5%, compounded continuously. calculate the balance of your account after 12 years.

    asked by heidi on August 6, 2013
  59. Chemistry

    For the reaction N2O4(g)=2NO2(g), the value of K at 25 degrees XCelsius is 7.19*10^-3. Calculate N2O4 at equilibrium when NO2 =2.20 *10^122 mol/L?

    asked by Amy on July 14, 2012
  60. chemistry

    130cm3 of a gas excarts a pressure 750mmhg . calculate it pressure if its volume is increase to 150cm3 at 35oc

    asked by whiskey on August 9, 2017
  61. statistics

    Consider a population with µ=93.3 and σ=5.27. (A) Calculate the z-score for x=94.9 from a sample of size 12. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?

    asked by Dawn on October 17, 2012
  62. Statistics

    Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the z-score for x =72.7 from a sample of size 45. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?

    asked by jane on October 24, 2011
  63. chem 1046

    Calculate the boiling point a. 10.5 g FeCl3 in 2.11 102 g water b.4.6% KCl by mass (in water) c.0.140 m MgF2

    asked by Anonymous on July 6, 2012
  64. Astronomy

    Calculate the approximate circumference of Earths orbit around sun, assuming that orbit is a circle with radius of 1.5 X 10 to the eighth.

    asked by Kandice on June 11, 2014
  65. Chemistry

    the question says: Calculate the mass of soap (NaC17H35COO) which contains 1.25 grams of Carbon. Do I use the percentage composition of soap and the mole?

    asked by Lauren on June 14, 2016
  66. physics

    A constant force of 48.7 N, directed at 34.1° from horizontal, pulls a mass of 15.1 kg horizontally a distance of 2.77 m. Calculate the work done by the force.

    asked by help on November 21, 2010
  67. Calculus

    Consider the region in the plane consisting of points (x, y) satisfying x > 0, y > 0, and lying between the curves y=x^2 +1and y=2x^2 −2. (b) Calculate the area of this region.

    asked by Mary on May 16, 2016
  68. college chem 2

    The enthalpy of vaporization of liquid diethyl ether is 26.0kJ/mol at 35'C calculate the deltaS' for vapor to liquid

    asked by shel on March 24, 2014
  69. Chemistry

    Calculate the mass in grams for a gold sample that absorbs 245J to change its temperature from 19 degrees to 49 degrees

    asked by Wendy on March 5, 2011
  70. Maths

    the acute angles of a rhombus are 76 degrees if the shorter diagonal is of length 8 cm calculate of the sides of the rhombus to the nearest mm

    asked by Anita on January 9, 2016
  71. honors chem high school

    The topic is Changes in energy Level Calculations. calculate energy value for levels n=1 to n=7; given En=-Rh/n2 R=2.180 x 10 -18 J E=hv h=6.626 x 10 -34 J.s I then need to plot them -- I cannot get started.

    asked by kate on October 3, 2012
  72. statistics

    For a normal distribution, explain why we calculate the probability of a range of numbers instead of the probability of a single number on the lines below?

    asked by rehena on June 9, 2014
  73. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

    asked by Ariel on February 27, 2011
  74. Physics

    calculate the work required to launch a satellite from the surface of the earth (radius6380km) to orbit 6000 km above the surface

    asked by Henry on February 16, 2014
  75. Chemistry

    3NO2 + H2O -> 2HNO3 + NO Calculate the percent yield for the following reaction if 76.8 g of H2O reacted and 125 g of NO were produced.

    asked by Amanda on November 25, 2014
  76. Physics

    A car requires velocity of 36 km /h in 10 sec just after the start . It takes 20 sec to stop . Calculate the acceleration in both the cases

    asked by Srishti on May 31, 2016
  77. phyics-universal gravity

    Calculate the force of gravity on a spacecraft 6400 km (1 earth radii) above the Earth's surface if its mass is 1600 kg.

    asked by DJ on November 3, 2009
  78. chemistry

    when one gram of water solidifies to ice 333.33 j of heat is evolved. calculate enthalpy of fusion of ice?

    asked by gopal on July 30, 2013
  79. stats - URGENT!!!!

    the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

    asked by skitter on November 30, 2010
  80. chemistry

    The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.

    asked by Ciaria on March 13, 2015
  81. physics

    calculate the acceleration of a 2000kg single -engine airplane just before takeoff when the thrust of the airplane ia 500N Using the G.U.E.S.S. method

    asked by jim on November 2, 2009
  82. stats - URGENT!!!!

    the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

    asked by skitter on November 30, 2010
  83. chemistry

    A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1817 miles per hour.

    asked by brianna on November 1, 2013
  84. physics

    two lead spheres whose diameters are 20 cm and 2 cm are placed with centres 100 cm apart. Calculate the force of gravitation between them.(density of lead =11500 kg/m^3

    asked by Dhananjay on May 15, 2013
  85. Physics

    Calculate the thermal energy required to convert 5kg of ice at 0 Celsius to steam at 100 Celsius

    asked by Lina on February 19, 2016
  86. Math

    A sequence {an} is given by a1=root(3), a n+1 = root(3+an). show that {an} is monotonic and bounded, and calculate lim (n->infinity) an, if it exists. Could someone just tell me what answer they get?

    asked by Hannah on July 11, 2009
  87. algebra

    On average a family of four consums 247.2 gallons of water per day. Calculate the quarterly bill for family of four

    asked by Anonymous on October 24, 2016
  88. math

    How do I calculate value of pi upto 200 decimal places ? Please email me the answer to my email address homework@live.in .

    asked by I want homework help on December 17, 2007
  89. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

    asked by Ariel on February 27, 2011
  90. Business Math

    Marcus invests $8,000, at 8% interest, compounded annually for 15 years. Calculate the compound interest for his investment.

    asked by Jasmine on March 16, 2019
  91. chemistry

    Consider the galvanic cell constructed from the following metals and their corresponding metal ions: E degrees (V) M^3+^ + 3e^-^ ----> M 0.29 N^2+^ + 2e^-^ ----> N 0.61 calculate the value of K for the cell reaction at 25C

    asked by eric on July 13, 2012
  92. calc

    a rectangle is inscribed in the upper half of the circle x^2+y^2=a^2 calculate the area of the largest such rectangle. So A=2xy y=sqrt(a^2-x^2)A what do I do from there?

    asked by hannah on August 20, 2014
  93. Math

    The surface area of the moon is 37 832 330 km squared. Calculate the side length of a square with the same area.

    asked by KimY on October 1, 2011
  94. ctu math

    calculate the interest charge on a $5.000 balance with the visa student card annual interest rate of 10.8%

    asked by simone on August 3, 2013
  95. chemistry

    Calculate the mass percent composition of carbon in each the following carbon compounds. a) C_4H_10 b) C_6H_10 c) CCl_2F_2 d) C_8H_13O_5N

    asked by Mely on September 11, 2010
  96. chemistry

    Calculate the mass percent composition of carbon in the following carbon compound. C_8H_13O_5N I got 0.4729 as an answer but it's wrong. Please help me.

    asked by Mely on September 11, 2010
  97. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

    asked by Ariel on February 27, 2011
  98. stats - URGENT!!!!

    the following sample observations were randomly selected: x: 2,5,6,8,9,11,15 y: 22,23,16,18,19,13,12 a)calculate the correlation coefficient, r b) determine the regression equation c) determine the value of Y when X=20

    asked by skitter on November 30, 2010
  99. Math

    The angles of depression of two stones one mile apart on the same side of a tower are 30° and 45° .calculate height of the tower.

    asked by Nisha on March 19, 2017
  100. Chemistry

    A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 5.8cm . Its mass is 1.5kg . Calculate the density of the metal.

    asked by Jenn on September 2, 2013

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