1. chemistry

    An unknown mixture containing KClO3 was added to an ignition tube weighting 41.960g, The tube and mixture was then found to weight 43.772g. After the first heating, the tube and its contents weighed 43.621g. After the second and third heatings, it weighed
  2. Physics

    A physics student of mass mm = 100 kg gets a summer job painting houses. On his first project, he builds a platform using large pine board with a mass of mb = 60 kg The board has an overall length of L = 8.5 meters and set on two 1 meter tall saw horses so
  3. Trig

    Use linear velocity to find out how many miles per hour Jethro's truck is going. In 15 seconds, Jethro's truck's 24-inch diameter tires rotated 101 times.
  4. Physics

    A sphere of radius 2.84 cm and a cylinder of radius 8.97 cm are rolling without slipping along the same floor. The two objects have the same mass. If they are to have the same total kinetic energy, what should the ratio of the sphere\'s angular speed to
  5. Math

    when 4^101+6^101 is divided by 25, the remainder is: (A)20 (B)10 (C)5 (D)0
  6. physics

    A girl sits on a tire that is attached to an overhanging tree limb by a rope 2.13 m in length. The girl’s father pushes her with a tangential speed of 2.92 m/s. Besides the force opposing the girl’s weight, the magnitude of the force that maintains her
  7. Physics

    A 784 Newton astronaunt travels to Neptune's largest moon, Triton, with a simple bathroom scale. While standing on the surface of the moon, he finds that he now weighs only 62 Newtons. What is g, acceleration due to gravity, on Triton? g=weight/mass Is
  8. Chemistry

    I'm having a problem with a simple conversion question! "What is the molarity of 30.0 g of NH3 in 70.0 g of water? The desnity of the solution is 0.982 g/mL, and the molecular weight of ammonia is 17.0 g/mol" 1.76 mol NH3 Vsolution = mass/density V=
  9. physics

    In the figure, the radius of the submerged cylinder is 10 cm. The height is 25 cm. The cylinder is made of Aluminum whose density is the water density is What is the buoyant force on the cylinder? Repeat the calculation if the object were inside Glycerin (
  10. Physics

    A uniform solid cylinder of mass M = 2 kg is rolling without slipping along a horizontal surface. The velocity of its center of mass is 27.6 m/s. Calculate its energy. I got 761.76 Joules but I think it's wrong.
  11. Chemistry(Please help!!)

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass
  12. Chemistry

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass
  13. math

    A right cylinder has a total surface area of 471 square centimeters. The radius of the cylinder is 5 centimeters. What is the height in centimeters of the cylinder?
  14. math

    The volume of a cylinder (think about the volume of a can) is given by V = £kr2h where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 100 cubic centimeters. a)
  15. Science

    help fastwhich of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record
  16. Math - Averages

    Six dogs have an average(arithmetic mean) weight of 55 pounds. If the heaviest dog weighs 100 pounds, the lightest dog weighs 5 pounds, and the second-lightest dog weighs 30 pounds, what is the average weight of the other 3 dogs in pounds?
  17. chem

    a gas mixture is comprised of 32% oxygen and the rest is nitrogen. If the scuba tank is pressurized to a total pressure of 132 atm what are the partial pressures of the oxygen and nitrogen inside the tank? I'm having trouble understanding how to find
  18. Chemistry

    when 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at a constant pressure and temperature, 78.0 kj of heat is given off. write a thermodynamic equation for this reaction.I don't know how to set up the
  19. Science check answer quick!

    I really do not understand Number 7 Which of these does Newton's law of universal gravitation imply? (Points : 1) The force of gravity between two objects is inversely proportional to the product of the two masses. <-- Earth's gravity acts on people
  20. Chemistry

    When 0.40 g of impure zinc reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10 degress C The external pressure was 737.7 Torr. a) What volume would the dry hydrogen occupy at 1.00 atm and 298 K ? b) What amount
  21. Chemistry

    Suppose you have to prepare 1.00 L of the solution ( KH2 PO4 and Na2 HPO4 pH=7.31) and that this solution must be isotonic with blood (have the same osmotic pressure as blood). What mass of KH2 PO4 would you use? b) What mass of Na2 HPO4 . 12 H2O would you
  22. physics

    A chandelier of mass 250 kg is hung vertically from a ceiling using a 1.25 m long brass rod of square cross-section of sides 0.4 cm each. How much will the rod stretch when the chandelier is hung? By what factor is the minimum breaking load greater than
  23. Statics

    I have a structure that is constructed of circular rod that has a mass of 7 kg per meter of length. I must determine the moment Mo about O caused by the weight of the structure. From the origin (O), the structure is 2m tall (z direction), branches outward
  24. physics

    A chandelier of mass 250 kg is hung vertically from a ceiling using a 1.25 m long brass rod of square cross-section of sides 0.4 cm each. How much will the rod stretch when the chandelier is hung? By what factor is the minimum breaking load greater than
  25. physics

    A model airplane of mass 0.7 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.6 m, making 1.6 revolutions every 7 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the
  26. physics

    A model airplane of mass 1.5 kg is attached to a horizontal string and flies in a horizontal circle of radius 5.8 m, making 2 revolutions every 8 s. (The weight of the plane is balanced by the upward “lift” force of the air on the wings of the
  27. chemistry HELP!!

    Reaction Rate = -(1/2) [d(H2O2)/dt] = [d(O2)/ dt] Using 25 mL of a 0.2 M hydrogen peroxide solution, the following results are obtained from the equation above: 8.62 mL of gas is collected in 120 seconds. (Assume 760 Torr = 1 atm) Room temperature is 25
  28. PHYSICS-please help! :)

    If deep-sea divers rise to the surface too quickly, nitrogen bubbles in their blood can expand and prove fatal. This phenomenon is known as the bends. If a scuba diver rises quickly from a depth of 25.0 m in Lake Michigan (which is fresh water), what will
  29. Physics

    A 0.60-kg basketball is dropped out of the window that is 6.1 m above the ground. The ball is caught by a person whose hands are 1.2 m above the ground. (a) How much work is done on the ball by its weight? (b) What is the gravitational potential energy of
  30. Chemistry

    A driving bell is a container open at the bottom. As the bell descends, the water level inside changes so that the pressure inside equals the pressure outside. Intially the volume of air is 8.58m^3 at 1.020 atm and 20 degrees C. What is the volume at 1.584
  31. Chem Lab Help

    Trial #1 Trial #2 Trial #3 Mass: gelatin capsule (g) .123 .118 .122 Mass: whole alka-seltzer tablet (g) 3.230 3.230 3.230 Mass: capsule + alka-seltzer sample (g) .822 .882 .677 Mass: system before reaction (g) 23.109 23.110 22.735 Mass system after
  32. chemistry - enthalpy change and finiding volume of

    29. Consider the following chemical equations and their enthalpy changes. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) ΔH = −8.0 × 102 kJ CaO(s) + H2O(_) → Ca(OH)2(aq) ΔH = −65 kJ What volume of methane, at 20°C and 100 kPa, would
  33. Chem

    When 0.10 g of insulin is dissolved in 0.200 L of water, the osmotic pressure is 2.30 Torr at 20°C. What is the molar mass of insulin? I tried using the van't hoff equation, converting Torr into atm; but not sure how to do it. my teacher didn't really
  34. physics

    An 849 g mass is attached to a pulley and a 9 N weight is attached to a thin massless cord, as shown below. .5 849 g 9 N T What is the tension T? The pulley is massless and frictionless. The acceleration of gravity is 9.8 m/s 2 . Answer in units of N
  35. Chem

    if the pressure was increased in this reaction : 2NO(g)+ O2 =====> 2NO2 <==== wouldnt the product side be favored? Please tell me if I'm right or wrong There are three volumes on the left, two on the right. If pressure is increased, the reaction to
  36. Chemistry AP

    At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution.
  37. physics

    A bicycle wheel has a diameter of 57.7 cm and a mass of 2.66 kg. The bicycle is placed on a stationary stand and a resistive force of 156 N is applied tangent to the rim of the tire. Assume that the wheel is a hoop with all of the mass concentrated on the
  38. Physics

    The space shuttle has a weight 2.00 x 10^7 N. The shuttle is accelerated upward at a rate of 5.50 m/s^2. What is the mass of the shuttle? What is the thrust (force) of the combined engines? What is the magnitude of the net force applied to the space
  39. physics

    A Helicopter lifts a Gorrila With Weight 50000kg on String a and on String B a Bunch of Bananas Mass 2000kg , Calculate the Acceleration of the Bunch of Bananas. The helicopter accelerates upwards 1m.s^-2
  40. Chemistry

    To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.7-L bulb, then filled it with the gas at 1.30atm and 30.0 ∘C and weighed it again. The difference in mass was 3.9g . Identify the gas.
  41. chemistry

    To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 3.4-L bulb, then filled it with the gas at 1.40atm and 25.0 ∘C and weighed it again. The difference in mass was 5.5g . Identify the gas.
  42. chemistry

    To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.8-L bulb, then filled it with the gas at 1.20atm and 22.0 ∘C and weighed it again. The difference in mass was 3.9g . Identify the gas.
  43. chemisty

    To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 1.00-L bulb, then filled it with the gas at 1.10 atm and 23.0 C and weighed it again. The difference in mass was 1.27 g . Identify the gas.
  44. chem

    To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 4.3-L bulb, then filled it with the gas at 1.90 atm and 21.0 C and weighed it again. The difference in mass was 9.5 g . Identify the gas.
  45. Chemistry

    A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My
  46. PE

    1. True or False The number of calories consumed must equal the numbers of calories burned A.True B.False 2.Which of the following factors that contribute to your weight do you have the least amount of control over? A. Activity level B. Peers c. Body
  47. history

    1. True or False The number of calories consumed must equal the numbers of calories burned A.True B.False 2.Which of the following factors that contribute to your weight do you have the least amount of control over? A. Activity level B. Peers c. Body
  48. science

    1) The force of gravity on the moon is 1/6 the force of gravity on earth. If you had a 1 kg box of cereal on earth which had a weight of 2.4 N, what would its mass be on the moon? why? 2) what is the volume of a textbook with dimensions 21.3 cm, 27.5 cm,
  49. math

    Mario plays basketball for 30min on Monday,60 min on Tuesday, 90min on Wednesday, 120 min on Thursday,150 min each on Friday and Saturday, and rests on Sunday. How many hours does he spend playing basketball in 1 week?
  50. Algebra 1 (Ms. Sue)

    1). Solve each equation. 17 = w - 4 2/3s = -6 1/3y + 1/4 = 5/12 x/8 - 1/2 = 6 5/6x - 1/3 = 5/2 2). In 1668, the Hope diamond was reduced from its original weight by about 45 carats, resulting in a diamond weighing about 67 carats. Write and solve an
  51. Physics

    A beaker of mass 5kg containing oil of mass 17.4 kg and density 8.5 x102kg/m3 rests on the scale A block of iron of mass 6.7kg is suspended from the spring scale and completely submerged in the oil as shown in Figure below. Determine the equilibrium
  52. Math

    1)The sum of a number and 17 more than twice the same number is 101. Find the number. 17+2n=101 17-17 101-17 2n=84 n=42(answer) 2)Evaluate: 5-/a+5b/ if a=-12 and b=2. 5-/-12+5(2)/ 5-/-12+10/ 5-/-2/ 5-2 3(answer)
  53. Chemistry

    We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true
  54. Chemistry

    We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true
  55. chemistry

    To identify a diatomic gas (), a researcher carried out the following experiment: She weighed an empty 2.4- bulb, then filled it with the gas at 1.70 and 28.0 and weighed it again. The difference in mass was 4.7 . Identify the gas.
  56. CHEM

    To identify a diatomic gas (), a researcher carried out the following experiment: She weighed an empty 1.00- bulb, then filled it with the gas at 1.10 and 23.0 and weighed it again. The difference in mass was 1.27 . Identify the gas.
  57. physics- Electromagnetic waves

    A long hollow non-conducting cylinder of radius 0.060 m and length 0.70 m carries a uniform charge per unit area of 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration of 40
  58. physics- Electromagnetic waves

    A long hollow non-conducting cylinder of radius 0.060 m and length 0.70 m carries a uniform charge per unit area of 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration of 40
  59. Pharmacy Math

    A prescription calls for 250ml of a 0.1N hydrochloric acid HCL solution. How many ml of concentrated hydrochloric acid are needed to make this solution? The specific gravity hydrochloric acid is 1.18 the molecular weight is 36.46 and the concentration is
  60. science

    calculate the amount of heat evolved in the complete oxidation of 8.17g of Al at 25 degrees C and 1 atm pressure. change in H for Al2O3 is -1676kJ/mol. 4Al(s) + 3O2(g)--> 2Al2O3(s) please giv me the steps to solving this thanx. delta H = -1676 kJ/mol
  61. physics

    An airplane is moving through the air at a velocity v=200m/s. Streamlines just over the top of the wing are compressed to 80% of their original area, and those under the wing are not compressed at all. a) Determine the velocity of the air just over the
  62. chem

    The solubility of nitrogen in water is 8.21 E-4 mol/L at 0°C when the nitrogen pressure above water is 0.790 atm. Calculate the solubility of nitrogen in water when the partial pressure of nitrogen above water is 9.55 atm at 0°C?
  63. Algebra

    The question A granite cube is 10 times that of another granite cube. The pressure exerted by the larger cube on its base is how many times more the pressure exerted by the smaller cube on its base?
  64. chemistry

    Phosgene (COCl2) is an extremely poisonous gas that was used extensively in World War I as a chemical warfare agent. At 300oC, phosgene decomposes to carbon monoxide and chlorine with a Kp = 6.8 x 10-2. Calculate the pressure in the vessel at equilibrium
  65. accounting -annual amount

    The exhaust-gas temperature leaving a continuously operating furnace is 260°C, and a proposal is being considered to install a heat exchanger in the exhaust-gas stream to generate low-pressure steam at 105°C. the question to be investigate is whether it
  66. accounting -annual amount

    The exhaust-gas temperature leaving a continuously operating furnace is 260°C, and a proposal is being considered to install a heat exchanger in the exhaust-gas stream to generate low-pressure steam at 105°C. the question to be investigate is whether it
  67. CHEM

    To identify a diatomic gas (), a researcher carried out the following experiment: She weighed an empty 1.00- bulb, then filled it with the gas at 1.10 and 23.0 and weighed it again. The difference in mass was 1.27 . Identify the gas. Express your answer as
  68. physics

    The space shuttle has a mass of 2.0 × 106 kg. At lift-off the engines generate an upward force of 30 × 106 N. a. What is the weight of the shuttle? b. What is the acceleration of the shuttle when launched? c. The average acceleration of the shuttle
  69. Chemistry-DrBob222

    A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My
  70. Chemistry-DrBob222

    A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My
  71. Org. Chem.

    Is there a correlation between the values of the distribution coefficients and the polarities of the three compounds? Explain. Place 0.050 g of one of the solids (benzoic acid, succinic acid, or sodium benzoate) in a vial and add 2 mL of methylene chloride
  72. Chemistry

    A 5.00L steel cylinder is filled with water vapor at 650mmHg and 100C. Calculate the density of the gas.
  73. Math

    The air pressure in a tire is 800.000kPa.The internal surface area of the tire is 550.000cm^2. Determine the total force applied by the air to the tire. (Round to 3 decimal places). ANS = 44.000kN Force = Pressure x Area = 800.000kPa x 550.000 =
  74. Math

    Students in Mr.Tandoc's shop class made a circular railroad crossing sign for a school play. The diameter of the sign was about 4 feet. How does the diameter compare to the circumference of the sign? A.The diameter is about 1/3 of the circumference B.The
  75. Math

    Students in Mr. Tandoc's shop class made a circular railroad crossing sign for a school play. The diameter of the sign was about 4 feet. How does the diameter compare to the circumference of the sign? A. The diameter is about 1/3 of the circumference B.The
  76. Physics

    A ladder of mass M and length 6 m rests against a frictionless wall at an angle of 50 degrees to the horizontal. The coefficient of static friction between the ladder and the floor is 0.5. What is the maximum distance along the ladder a person of mass 11M
  77. Physics

    A ladder of mass M and length 2 m rests against a frictionless wall at an angle of 47 degrees to the horizontal. The coefficient of static friction between the ladder and the floor is 0.5. What is the maximum distance along the ladder a person of mass 13M
  78. Chemistry

    A gas at 65 degrees Celsius occupies 4.22L. At what Celsius temperature will the volume 3.87L, assuming the same pressure? -kay so ive tried this one like a million times & i cant seem to get the right answer so pls talk me through the steps. like i know
  79. Chemistry/Equilibrium calculations

    At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)-> <- 2CO(g)+ O2(g) is about 1 E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at
  80. Chemistry

    An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) has a partial pressure of 217.0 torr, 13.2 torr, and 13.2 torr, respectively. A quantity of Cl2(g) is injected into the mixture, and the total pressure jumps to 263.0 torr. The appropriate chemical
  81. Physics

    A) On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.00 m away from your sailboat in the horizontal direction. When you are 2.20 m below the surface, the top of the sailboat mast appears to you to be in a direction 36.0° from
  82. physics

    A 100-cm3 container has 4 g of ideal gas in it at 250 kPa. If the volume is changed to 50 cm3 and the temperature remains constant, what is its new density? Answer 400 kg/m3 250 kg/m3 80 kg/m3 50 kg/m3
  83. Solution Preparation

    I need help with Writing a Report Purpose: Preparing 0.2 M 250 ml NaOH solution? Equipments and Materials: Equipments: -Balance -Beaker(250ml) -Graduated cylinder Materials: -Pure water -NaOH Procedure: 1)Calculate the required amount of NaOH in gr.
  84. Geometry

    The main tank at an aquarium is a cylinder with diameter 203 ft and height 25 ft. Using 3.14 for pi, find the volume of the tank to the nearest cubic foot.
  85. Geometry

    CAN SOME ONE JUST HELP ME HOW TO START IT OF PLEASE.. The foundation for a cylindrical water tank is a cylinder 27 ft in diameter and 3 ft high. How many cubic ft of concrete are needed to build the foundation?
  86. Chemistry

    In a 100g sample of water, determine the amount of weight that is attributed to Hydrogen and to Oxygen. i found the mass ratio which is 2:16 & then reduced its 1:8. then i set up my equation. 1x+8x=100g 9x=100g x=11.11111111 or 100/9 then i have to
  87. Chemistry

    In a 100g sample of water, determine the amount of weight that is attributed to Hydrogen and to Oxygen. i found the mass ratio which is 2:16 & then reduced its 1:8. then i set up my equation. 1x+8x=100g 9x=100g x=11.11111111 or 100/9 then i have to
  88. physics

    A plank 2.00 cm thick and 16.3 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. A man of mass 87.6 kg is forced to stand on the very end. If the end of the board
  89. SCIENCE HELP!

    Carl crumpled a piece of paper before throwing it into the trash can. Which is true about the paper after it was crumpled? 1. Its weight changed. 2. Its mass changed. 3. Its form changed. 4. Its density changed.
  90. Physics

    A bunch of grapes is placed in a spring scale at a supermarket. The grapes oscillate up and down with a period of 0.41 s, and the spring in the scale has a force constant of 640 N/m. What is the mass of the grapes? What is the weight of the grapes?
  91. Physics _ Please please help

    A hollow brass cylinder is weighed on a pan balance (kitchen scale) which read in kg. The scale reading is 5.56 kg. The brass cylinder is now removed from the scale and is replaced by a beaker of liquid density 1.56 * 10^3 kg/m^3; the scale now reads 17.50
  92. chemistry

    Which of the answer choices correctly describes an action that will increase the solubility of a solid solute in water? cool the solution increase the pressure heat the solution decrease the pressure Examine the statement. The energy required to break the
  93. Chemistry

    In 2.00 min, 28.4 mL of He effused through a small hole. under the same pressure and temperature, 9.69 mL of a mixture CO and CO2 effused trough the hole in the same amount of time using the following mathematical formula relating rate of effusion to molar
  94. science

    what is the weight of the balloon with air
  95. weight

    why is having abdominal fat a serious concern
  96. Geography

    What is the weight of air called?
  97. statistics

    Is weight an example of a discrete variable?
  98. science

    does density affect weight?
  99. chemistry

    what is the weight in kg of 3*10 22 molecules of NaOH
  100. chemistry

    How do you figure out the molecular weight?