1. physics

    two boys paul mass 60kg and john mass 40kg are standing on skateboards. They place their hands against each other and push away from each other so that they start to move in opposite direction. (a) if paul moves to the left with velocity of 0.8m/s..

    asked by lebohang on April 18, 2012
  2. Physics

    A child is on a swing whose 4.0 m long chains make a maximum angle of 30 deg with the vertical. What is the child's maximum speed? I've found problems relating to this but include mass or delta(x) in how far from stationary. This problem doesnt include

    asked by Anonymous on February 25, 2016
  3. thermodynamics

    At 2068.44kPaa, 37.8 celcius, 0.142 cubic meter of methane have a total mass of 1.82kg. Using avogadro's principle find the mass of carbong dioxide contained in a 0.85cubic meter tank at 2068.44kPaa,37.8 celsius

    asked by chi on September 17, 2012
  4. Physics

    In the figure, the meterstick's mass is 0.130 kg and the string tension is 2.30 N . The system is in equilibrium. A) Find the unknown mass m. B) Find the upward force the fulcrum exerts on the stick. I found part A and the answer is .634kg but I can not

    asked by Kaitlyn on March 27, 2017
  5. Science-please help

    The gravitational force of the Earth acting on an object with more mass is stronger than the force on a smaller mass object of the same size, yet they both fall at the same rate of increasing speed (i.e. balls of different masses but with similar sizes

    asked by Karen on February 21, 2009
  6. physics

    A thin stick of mass M = 2.0 kg and length L = 2.6 m is hinged at the top. A piece of clay, mass m = 1.0 kg and velocity V = 0.9 m/s hits the stick a distance x = 1.90 m from the hinge and sticks to itWhat is the ratio of the final mechanical energy to the

    asked by anonymus on September 12, 2018
  7. physics

    A blob of mass 5 kg is place on a table top.it is attached to a mass piece of 2kg by a light string that passes over a frictionless pulley.the table top exerts a frictional force of 7 N on the block (a) calculate the tension of the string

    asked by nyove on June 3, 2015
  8. Chemistry

    6Li(s) + N2(g) 2Li3N(s) a) What mass of lithium is required to produce 0.575 g of Li3N in the balanced reaction? b) What mass of nitrogen is required for the reaction? ------------------------------------------- I tried dimensional analysis in a couple

    asked by Brian on March 8, 2015
  9. Chemistry

    Determine the mass of a nonvolatile, nonionizing compound that must be added to 4.68 kg of water to lower the freezing point to 98.70oC. The molar mass of the compound is 50.0 g/mol and the Kf for water is 1.86oC kg/mol. Ignore significant figures for this

    asked by renee on February 22, 2012
  10. Physics

    A bullet of mass 10.6 grams is fired with a speed of 125 meters per second toward a wood block of mass 187 grams initially at rest on a very smooth (assume frictionless) surface. What is the change in momentum of the bullet if it becomes embedded in the

    asked by Matt on October 10, 2013
  11. hw

    A railroad car of mass m = 30000 kg moving at v1 = 2.9 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at v2 = 1.711 m/s. What is the magnitude of the kinetic energy lost in

    asked by larry on October 14, 2014
  12. math

    Scientists are conducting an experiment with a gas in a sealed container. The mass of the gas is measured, and the scientists realize that the gas is leaking over time in a linear way. Six minutes since the experiment started, the gas had a mass of 144

    asked by Lena on February 3, 2016
  13. physics help

    An automobile tire has a radius of 0.280 m, and its center moves forward with a linear speed of v = 18.0 m/s. (a) Determine the angular speed of the wheel. (Assume that there is no slipping of the surfaces in contact during the rolling motion.) rad/s (b)

    asked by john on November 27, 2010
  14. Chemistry

    In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper should be the same as the

    asked by melbell on October 5, 2014
  15. science

    Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its

    asked by jacob on April 11, 2016
  16. Physics

    I calculated tan and sin (theta) for a physics lab experiment -- two-slit interference I had to use this equation y = L tan (theta), with y = 0.25 and L = 2 and tan (theta) came out to be 7.12 in degrees and 0.1243 in radians. I found sin (theta) by using

    asked by Anna on December 8, 2012
  17. Biology/Science

    1. A corn plant over the course of a summer can weigh 500 grams (dry biomass, after removing the water), yet it starts from a seed that weighs less than 1 gram. What is the primary source of this increased mass? What process(es) are responsible for the

    asked by Anonymous on February 1, 2014
  18. Science

    1. A corn plant over the course of a summer can weigh 500 grams (dry biomass, after removing the water), yet it starts from a seed that weighs less than 1 gram. What is the primary source of this increased mass? What process(es) are responsible for the

    asked by Anonymous on February 3, 2014
  19. CHEM_

    if 16.5 of iron (II) sulfide contain 6.02 x 10^23 formula units, how many formula units of iron (II) sulfide are in 1.00 mL of iron (II) sulfide? The density of iron (II) sulfide is 4.84 g/cm^3

    asked by Sienna on March 22, 2010
  20. Physics

    1. A gold atom has a mass of 3.287 • 10-25 kg and is at rest. It emits an alpha particle that has a mass of 6.646 • 10-27 kg. In this process, the gold atom is transformed into an iridium isotope. The alpha particle has a speed of 3.40 • 106 m/s. A.

    asked by Riley on November 14, 2013
  21. English 9

    make separate absolutes for each of the following: Moshe the Beadle- spiritual leader, outsider Elie's father- closest relative, caring Elie's mother- mom, lost in begining of the book Hilda- Elie's sister Gestapo- Officer that took Elie away from his

    asked by Austin on February 13, 2012
  22. science

    water condenses onto the grass in the early morning when the air is clear because? A the air near the ground is warmer than the ground B the air near the ground cools to its dew point( I think this is the answer) C the relative humidity decreases D the

    asked by Helpme i d not know these questions on February 12, 2018
  23. reimbursement methodologies

    you're reviewing reimbursement for a Medicare surgical craniotomy case. the case falls into DRG 1, which has a relative weight of 3,0970 and a geometric mean length of stay of 6.3. the hospitals's current standard reimbursement rate $1500. calculate the

    asked by Karen on September 12, 2010
  24. Physics

    Suppose you are stopped for a traffic light, and an ambulance approaches you from behind with a speed of 19.0 m/s. The siren on the ambulance produces sound with a frequency of 960 Hz as measured when you are at rest relative to the ambulance. The speed of

    asked by Tessa on March 1, 2013
  25. physics homework

    I need help with the following questions: You are driving north on a highway. Then, without changing speed, you round a curve and drive East. What is it that changes when you make this turn? Would it be acceleration, direction, velocity, and distance

    asked by Soly on September 9, 2007
  26. physics

    A 4.85-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.645. What is the maximum horizontal force that can be applied before the 4.85-kg block begins to slip

    asked by zach on November 7, 2011
  27. Physics

    A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.650. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip

    asked by John on November 10, 2014
  28. Chemistry

    What is the empirical distinction between emission and absorption spectra? In general terms, how did Niels Bohr explain each of these spectra? In general terms, emission spectra are obtained when the electron is at a high energy level and it falls to a

    asked by Raj on February 7, 2007
  29. Maths

    3. Ohm’s law states that the current flowing in a circuit varies directly as the applied voltage and inversely as the resistance. In an experiment, the resistance was increased by triple the percentage by which the voltage was increased. A student

    asked by David on November 17, 2012
  30. Organic Chemistry

    I have already calculated the volume of ethyl alcohol need to dissolve 0.300 g of sulfanilamide at 78 degrees Celsius. I got 1.429 mL ethyl alcohol. My question is: how do I calculate how many grams of sulfanilamide will remain dissolved in the mother

    asked by Sasha on September 14, 2015
  31. Physics(Please help)

    The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level â of the louder sound? I am not sure how to start this. Thank you.

    asked by Hannah on June 21, 2012
  32. Calculus

    Hello. I'm having problems with a couple of Calculus questions that involve maximums of geometric shapes. The first one is: 1. Find the dimensions and minimum volume of a right circular cone which can be circumscribed about a sphere of diameter 8. What I

    asked by Alex on January 11, 2007
  33. physics

    A spring has an unstretched length of 20 cm. A 100 g mass hanging from the spring stretches it to an equilateral length of 30 cm. suppose the mass is pulled down to where the spring's length is 40 cm. When it is released, it begins to oscillate. What is

    asked by Marie Barrientos on May 4, 2015
  34. Physics

    A bullet mass 10 g strikes a log with a mass of 25 g suspended from a 3 meter long string. The bullet lodges in the log which swings up through an angle of 30 degrees. Find the speed of the bullet just before it hit the log.

    asked by Mary on April 9, 2012
  35. mechanics

    Sketch a stress-strain curve for which the stress is calculated using the actual cross-sectional area rather than the original cross-sectional area. Explain why this curve differtypical stress-strain curve

    asked by dmkp on February 24, 2013
  36. physics

    A 0.46 kg object connected to a light spring with a spring constant of 18.0 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. unit = cm/s (b) Determine

    asked by :) on March 22, 2011
  37. Chemistry

    The value of delta H for the reaction below is -1107kj. 2Ba (s) + O2 (g) -> 2BaO (s) How many kJ of heat are released when 5.75 g of BaO (s) is produced? Here is how I approached this problem: 1. Converted 5.75 g of BaO to mol: 5.75g x (1mol BaO/153.3g

    asked by Thao on May 23, 2011
  38. Chemistry

    1. If a student forms CaCO3 from the presence of carbon dioxide, but continued with the trial anyway, how would this affect his/her calculations (too high, too low, or no effect)? Explain your answers. a) The volume of NaOH required for the back titration.

    asked by Josh on April 2, 2013
  39. physics

    Question Part Points Submissions Used A thin cylindrical rod of length 3.00 m and mass 1.5 kg has two spheres attached on its ends. The centers of the spheres are 1.50 m from the center of the rod. The mass of each sphere is M = 0.72 kg. The rod and

    asked by HALP!!! on December 2, 2012
  40. Physics

    A man with mass m1 = 59 kg stands at the left end of a uniform boat with mass m2 = 163 kg and a length L = 3.5 m. Let the origin of our coordinate system be the man’s original location as shown in the drawing. Assume there is no friction or drag between

    asked by MUHAMMAD JUNAID on April 3, 2019
  41. Reposting Chemistry Question -Emergency !!

    Saturated solution of Ca(OH)2 in 0.05349 mol/L NaOH. Temperature: 22.1 * C Volume of Ca(OH)2/NaOH aliquot: 25ml Concentration of Standard HCl: 0.1213M Indicator Used: Bromothymol Blue Ksp from previous part I got 3.55x10^-5 - Average volume of HCl added to

    asked by DrBobPleaseHelp on March 19, 2017
  42. chemistry

    TO DR.BOB222 hi i have a question. It's regarding a electrolytic cells. This lab has already been posted but i wanted to show you what i have so maybe you can check it for me. question: what is the mass of tin produced? what is the theoretical mass of tin

    asked by samantha on April 18, 2008
  43. Chemistry

    Hi, I have another question... I need to write a reaction for the preparation of americium by reducing AmF3 with barium vapor at 1100C I'v looked and can't find anything that will help me with this... (I'm preparing for finals, so this might not be my last

    asked by Lacey on June 9, 2007
  44. Physics

    A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. A rope is wound around the cylinder and its free end is attached to a block of mass 54.0 kg that rests on a platform. The cylinder has a mass of 265 kg and a

    asked by Goyle on April 10, 2014
  45. Physics

    A block of mass m1 = 22.0 kg is connected to a block of mass m2 = 40.0 kg by a massless string that passes over a light, frictionless pulley. The 40.0-kg block is connected to a spring that has negligible mass and a force constant of k = 260 N/m as shown

    asked by Anonymous on March 12, 2013
  46. psychology

    Psychologists are interested in people's behavior and their mental processes. Psychologists believe that: behavior is impacted by environment, but not by a person's physical state. behavior is affected by a person's mental and physical state, but rarely by

    asked by karl on October 28, 2010
  47. Physics

    A river flows toward the East at 1.5 m/s. Steve can swim 2.2 m/s in still water. If he wishes to cross the river so that his direction is northward, what direction relative to the water must he swim?

    asked by Al Hasiff on November 28, 2015
  48. physics

    If a truck is moving at 20m/s forward with relative to the ground, and a ball is fired 20m/s backward from the truck, what would be the velocity of the ball with respect to the ground?

    asked by rachel on August 21, 2012
  49. physics

    Vector A points to the north and has length A. Vector B points to the east and has length 2.5A. Find the direction of C= 7.4A+B Express your answer as an angle relative to east.

    asked by anonymous on February 20, 2011
  50. Physics

    My experiment setup was like this: i48.tinypic. com/14n31pl.jpg FYI, there is sandpaper between the ruler and the wall. I calculated the coefficient of friction to be 0.468. Is that correct? A second question asks that as the hanging weight is moved closer

    asked by Jeras on November 30, 2012
  51. General Physics

    Clarification: this is calculus-based physics, so the methodology is not restricted to trigonometry only. I have two questions, so hopefully I can divide them up nice and evenly. Also, if you know where I should copy and paste proper vector notation from,

    asked by Justin on June 23, 2016
  52. physics

    A train with a mass of 120Mg accelerates uniformly on a horizontal track.The resistance to movement is 5N per KN of the mass of the train.the force in the draw bar of locomotive is 80KN..calculate:1force reqqured for constant speed. 2.the force that causes

    asked by mashao on April 7, 2015
  53. AP Physics Momentum...stuck

    A spring loaded 100g dart gun is affixed at rest on a 150g frictionless cart. It fires a 25g dart with a velocity of 30 m/s. What is the final momentum of the system? I'm confused as to whether or not I should use conservation of momentum or center of

    asked by Tyger2020 on September 5, 2017
  54. AP Physics

    Two particles, each of mass m and speed v, travel in opposite directions along parallel lines separated by a distance d. (a) Find an expression for the magnitude L of the angular momentum of the two-particle system around a point midway between the two

    asked by Anonymous on March 20, 2013
  55. Physics

    A 5.8 kg mass, M1 is on a horizontal frictionless table. A horizontal string is attached to M1 and it passes over a pulley at the edge of the table to a 5.6kg mass M2 that is hanging down freely. Initially the two masses are held stationary and then

    asked by Sarah on February 11, 2019
  56. PHYSICS

    As part of a daring rescue attempt, the Millennium Eagle coasts between a pair of twin asteroids, as shown in the figure below where d1 = 2.97 km and d2 = 1.49 km. The mass of the spaceship is 2.57 107 kg and the mass of each asteroid is 3.15 1011 kg. If

    asked by Steve on March 17, 2011
  57. physics

    A shopper pushes a grocery cart 20m at constant speed on level ground against a 35N frictional force. He pushes in a direction 25 degrees below the horizontal. What is the work done on the cart by gravity? I know you can use W=Fdcos(theta) where

    asked by Juliette on October 4, 2010
  58. physics 12

    a certain binary star system consists of two stars of masses m and 3m respectively separated by a distance of 1.5 x 10^12 m, measured between their centres. Theres stars revolve in sync with each other around their common centre of mass like a giant

    asked by James on February 19, 2013
  59. Physics

    An airplane with a mass of 1.20x10^4 kg tows a glider with a mass of 0.60x10^4 kg. if the airplane propellers provide a net forward thrust of 3.60x10^4, what is the acceleration of the glider? I'm thinking that I should add the masses and then solve using

    asked by HiMyNameIsRandy on September 3, 2016
  60. Physics

    A cube of mass m1 = 6.8 kg is sitting on top of another cube of the same size and mass m2 = 0.7 kg while they are both in free-fall. Ignoring any air resistance, what is the magnitude of the normal force with which the bottom cube is acting on the top

    asked by anon on February 23, 2015
  61. Intergated chemistry/physics

    Your teacher bumps into you in the hallway and knocks you down. After he apologizes, he asks you to figure out how fast he was going. By some magical coincidence, you just happened to be wearing a gauge that measured your mass to be 75 kilograms and your

    asked by Laura on October 4, 2012
  62. Physics HELP!

    You are at the controls of a particle accelerator, sending a beam of 3.90×10^7 m/s protons (mass m ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the

    asked by Allison on May 11, 2011
  63. Organic Chemistry

    A 0.160 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.20° in a 1-dm sample container. The molar mass of the compound is 128.0 g/mol. (a) What is the specific rotation of D? (b) What is the observed rotation if this

    asked by Trish on September 29, 2014
  64. Physics

    The mass of a beetle is 0.000004kg. If a beetle's center of mass rises 0.75 mm while it is pushing against the floor and then continues to travel up to a height of 250 mm above the floor, what is the magnitude of the force exerted by the floor on the

    asked by Tyler on October 22, 2015
  65. Chemistry

    Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390% Cu by mass. If a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?

    asked by Melissa on September 11, 2010
  66. physicsssss

    two blocks are connected over a pulley. The mass of block A is 10 kg and the coefficient of kinetic friction between A and the incline is 0.24. Angle èof the incline is 30°. Block A slides down the incline at constant speed. What is the mass of block B?

    asked by ashley on October 3, 2010
  67. Physic

    The maximum speed of a mass attached to a spring is vmax = 0.438 m/s, while the maximum acceleration is 1.53 m/s2. What is the maximum displacement of the mass? (Answer: 0.125m) Answer is provided above. Please show all work on how to get the answer. Thank

    asked by Anonymous on May 22, 2014
  68. physics

    In the figure, two blocks are connected over a pulley. The mass of block A is 7.9 kg and the coefficient of kinetic friction between A and the incline is 0.18. Angle θ of the incline is 41°. Block A slides down the incline at constant speed. What is the

    asked by krals on March 17, 2016
  69. physics

    One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 1.03 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What is the magnitude of the

    asked by Anonymous on August 29, 2012
  70. Physics 12

    Help will be appreciated. In a large department store, a shopper is standing on the "up" escalator, which is travelling at an angle of 40 degree above the horizontal and at a speed of 0.75 m/s. He passes his daughter, who is standing on the identical,

    asked by G on March 29, 2013
  71. Physics

    A plane is headed due west with an air speed of 221 m/s. The wind blows south at 37.5 m/s. Find the velocity of the plane relative to the earth. The question asks for the magnitude which I found is 224 m/s. The question also asks for the

    asked by Lindsey on February 2, 2011
  72. PHYSICS

    An object with a mass of 14kg lies on a frictionless incline. A rope attached to the mass runs parallel to the incline and is connected to a wall at the top of the incline. If the rope is considered to be in static equilibrium what is the tension of the

    asked by MOLLY on October 13, 2012
  73. physics

    Gravitational force of attraction “F” exists between two point masses A and B when a fixed distance separates them. After mass A is doubled and mass B is quartered, the gravitational attraction between the two masses is

    asked by Samantha on April 21, 2010
  74. science

    a sphere A of mass 3.0kg moving at 8.0m/s collides with another sphere B of mass 5.0kg moving in opposite direction to A at 4.0m/s.find the velocities of the spheres immadiately after the impact if e=0.30

    asked by yusuph on August 11, 2018
  75. Science

    Are uniform metre rule of mass 120 grams is 60cm Mark at what point on the metre rule should a mass of 50 grams be suspended for it to balance horizontally

    asked by Allan on April 30, 2019
  76. Physics

    Consider a version of the atwood machine in which the masses are frictionless incline. The mass sliding on incline 1, m1, is 1.5 kg, and the angle of this incline is 62 deg. If the mass on the second incline, m2, is 2.5 kg, what is the angle 2 so that the

    asked by rachel on December 28, 2010
  77. chemistry

    I need help with these questions 1. Calculate the percentage by mass of potassium in potassium sulfate K2 SO4 2. calculate the percentage by mass of nitrogen in ammonium nitrate Nh4 No3

    asked by Victoria on January 25, 2015
  78. Chemistry

    A helium baloon has a volume of 28.9L, what is the mass of helium inside the ballon? what is the mass of the same volume of air it displaces? MM of air = 29.0g/mol, 25C (temperature) and 1 atm.

    asked by Ashley on November 17, 2010
  79. physics

    block a in figure 1 has a mass of 10kg, and block b and the horizontal surface is 0.3. a) what is the mass of block c if block b is moving with an acceleration of 3m/s/s b) what is the tension in each cord when b is moving with a constant velocity?

    asked by flay on January 9, 2013
  80. science

    hydrogen and oxygen combine in the ratio of 1:8 by mass to form water.what mass of oxygen gas would be required to react completely with 3grams of hydrogen gas?

    asked by sai on November 22, 2011
  81. physics

    Block a is moving with a certain acceleration along a frictionless horizontal surface. When a second block B is placed on top of block A, the acceleration of the combined block drops to 1/5 the original value. What is the ratio of the mass of A to the mass

    asked by maihul on November 30, 2012
  82. chemistry

    1.what is the volume of NaCl in cubic cm and cubic nm if the Length is 0.563 nm? 2. the density of NaCl is 2.17 g/cm. What is the Mass? 3. Each repeating unit is composed of 4 NaCl molecules. What is the Mass of 1 NaCl molecule?

    asked by andi on August 20, 2011
  83. physics

    Gravitational force of attraction “F” exists between two point masses A and B when a fixed distance separates them. After mass A is doubled and mass B is quartered, the gravitational attraction between the two masses is

    asked by cham on April 22, 2010
  84. physics

    A truck of mass 1.0 tonne moving at 4.0 m/s catches up and collides with a truck of mass 2.0 tonne moving at 3.0m/s in the same direction. The trucks become coupled together. Calculate their common velocity

    asked by lalala on January 20, 2014
  85. physics

    A force is applied to a 2.6 kg mass and produces 2.7 m/s^2 acceleration. What acceleration would be produced by the same force applied to 14.9 kg mass? Answer in units of m/s^2 Here is my work, but i wanted to make sure if it was right or not:

    asked by alexa on July 2, 2011
  86. physics

    A block of mass m is dropped from the fourth floor of an office building and hits the sidewalk below at speed v. From what floor should the mass be dropped to double that impact speed?

    asked by kevin on February 11, 2011
  87. Chemistry

    Can you help me understand how to review the math definition... what "percentage" means. I need to know what the total mass of the mixture of 42 grams of apples and 96 grams of oranges. ANd what is the percentage of mass the apples are? Thank you.

    asked by Hope on September 9, 2014
  88. Chemistry

    With the mass percent of Fe, oxalate ion, and water; find the mass percent of potassium ion in the complex iron salt difference. Fe= 11.37% H2O= 12.24% oxalate= 28.01%

    asked by Anonymous on November 13, 2012
  89. physics

    truck A of mass 2,5 x 10(4) kg approaches a second truck B of mass 2 x 10(4) kg with a velocity of 12 m.s -1 and collides with it. After collision the two trucks move apart with equal but opposite momenta. Calculate what the velocity of B was before the

    asked by Claudia on February 10, 2011
  90. CHEMISTRY

    CALCULATE THE MASS OF Na3PO3 PRODUCED AFTER 28.0g OF H3PO3 IS TREATED WITH 42.0g OF NaOH, AND ALSO CALCULATE THE MASS REMAINING OF THE EXCESS REAGENT. H3PO3+ 3NaOH = Na3PO3+ 3H2O

    asked by dana on April 19, 2011
  91. math

    Lois wants to send a box of oranges to a friend by mail. The box of oranges cannot exceed a mass of 10 kg. If each orange has a mass of 200g, what is the maximum number she can send?

    asked by rob on April 18, 2012
  92. chemistry

    A 0.682g sample of impure NAHco3 yielded a solid residue consisting of NAc03 and other solid with a mass of 0.467g. What was the mass percent of NAc03 in the sample. The right 85.4% Who help

    asked by Fai on November 23, 2012
  93. Weight Is Force! Science

    A space ship has a mass of 9000kg. the space ship is launched from Earth and lands on a distant planet where it has a mass of 390000 N. What is the acceleration of the gravity on this planet?

    asked by Anonymous on March 3, 2016
  94. Physics

    A 1.0kg mass weighs 9.8 Newton on earth's surface, and the radius of Earth is roughly 6.4 x 10 to the power of 6. The mass of the earth is 6.02 x 10 to the power of 24. Calculate the average density of Earth?

    asked by Rebecca on December 24, 2012
  95. OAKLAND

    Using mass percentages:- The American Dental Association recommends that you should consume 3.0 mg of fluoride a day. If you get your fluoride in the form of sodium fluoride, what mass of sodium fluoride should you ingest?

    asked by Mahnad on September 29, 2015
  96. physics

    A train consists of 40 freight cars, each having a mass of 2.71 × 105 kg. If the engine (which has twice the mass of a freight car) exerts a net force of +1.12 × 105 N, what will be the acceleration of this train?

    asked by tyler on August 24, 2012
  97. CHEM

    Using mass percentages:- The American Dental Association recommends that you should consume 3.0 mg of fluoride a day. If you get your fluoride in the form of sodium fluoride, what mass of sodium fluoride should you ingest?

    asked by Mahnad on September 29, 2015
  98. chemistry

    An isotonic solution contains 0.86% by mass per volume. Calculate the percent mass per volume for an isotonic solution of KCl at 30 degrees C. Assume a van't Hoff factor of 1.9.

    asked by Anonymous on February 3, 2011
  99. volume,mass,weight

    if you travelled to a planet that had twice the force of gravity of earth and you have taken a small mass that is 1kg what is the mass weight and volume of the 1kg object on the new planet compared to earth

    asked by dw on March 4, 2012
  100. chemistry

    if 32kj of energy results in an average weight gain of 1 g of body mass, then how much weight could a person gain after eating 1 cookie. mass of 15.21g of a cookie.

    asked by James on April 7, 2010

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