1. History

    What negative impact did gold and silver mining have in the West? A. Tent cities near the mines fostered criminals as long-term residents. B. Ghost towns were left behind after the mines stopped producing. C. Mining camps were sources of many contagious

    asked by Anonymous on February 12, 2019
  2. Chemistry--Quick Question

    Which of the following are LAWS according to the Scientific Method? It is possible for more than one answer. a. The volume of a gas is inversely proportional to its pressure. b. A solid has a mass of 100.0 grams and a volume of 11.1 mL. c. When a piece of

    asked by Kathryn on January 18, 2011
  3. American History

    what negative impact did gold and silver mining have in the west A) Tent cities near the mines fostered criminals as long-term residents B) Ghost towns were left behind after the mines stopped producing C) Mining camps were sources of many contagious

    asked by yogirlsman on January 24, 2018
  4. physics

    A spring is resting vertically on a table. A small box is dropped onto the top of the spring and compresses it. Suppose the spring has a spring constant of 450 N/m and the box has a mass of 1.5 kg. The speed of the box just before it makes contact with the

    asked by Anonymous on June 19, 2011
  5. Physics

    A 4 kg block resting on a frictionless horizontal ledge is attached to a string that passes over a pulley and is attached to a hanging 2 kg block. The pulley is a uniform disk of radius 9 cm and mass 0.2 kg. a. Find the speed of the 2 kg block after it

    asked by MUHAMMAD JUNAID on April 9, 2019
  6. Physics Magnetic Field

    In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction

    asked by Matt Damon on March 16, 2016
  7. Physics - Repost because of no response

    In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction

    asked by Matt Damon on March 16, 2016
  8. Physics

    A child riding a bicycle has a total mass of 40kg. The child approaches the top of a hill that is 10m high and 100m long at 5m/s. If the force of friction between the bicycle and the hill is 20N, what is the child's velocity at the bottom of the hill?

    asked by Monique on November 15, 2009
  9. science

    a car of mass 1360 kg descends from a hill of height 86 m at a constant speed of 20 km/h. assuming that all the potential/kinetic energy of the car goes into heat in the brakes, find the rise in temperature of the brakes (use the heat capacity (C) of the

    asked by kelsee on April 26, 2008
  10. Physics

    A 6-kg bowling ball with a radius of 14 cm is spinning about a vertical axis (with its center of mass motionless) at an initial rate of 3 turns per second. Friction with the floor, however, causes the bowling ball to rotate more and more slowly until it

    asked by Jordan on February 22, 2011
  11. Physics

    A body of mass 2kg falls freely from rest through a height of 50m and comes to rest having penetrated 5.0cm of sand. Calculate. (I) The velocity with which the ball hits the sand. (II) The time taken in falling. (III) The average force exerted by the sand

    asked by Anonymous on January 25, 2019
  12. Physics - Repost because of no response

    In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction

    asked by Matt Damon on March 16, 2016
  13. English

    So for English we're doing poetry. With a partner we both wrote our own poems and compared them. We had to find one word that fits into both poems and we got the word "Change". Now we have to be able to read our poems while not boring the class by doing

    asked by Brian on May 17, 2009
  14. chem

    Ammonia reacts with oxygen to form nitrogen dioxide and water according to the following equation: 4NH3(g) + 7O2(g) ® 4NO2(g) + 6H2O(g) You react ammonia and oxygen, and at the end of the experiment you find that you produced 27.0 g of water, and have

    asked by mich on November 2, 2009
  15. Physics (Magnetism)

    In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction

    asked by Kim Tuan on February 16, 2017
  16. physics

    luke skywalker must swing princess leia across a large chasm in order to escape the storm troopers. IF luke and leia's combined mass is 145 kg calculate the tension in the rope just before luke and leia start their swing when the pair makes an angle of

    asked by confuseedd and do not like physics on October 11, 2007
  17. Physics

    Sam, whose mass is 80kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 220N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 8.0s. a) What is Sam's top speed? b) How

    asked by Anonymous on October 1, 2012
  18. Astronomy - Physics

    Now let us consider the length of time that the Sun is visible. Wait until the planet is at the summer solstice (12:00am). a) How many hours of daylight are there on the summer solstice with the inclination at 45 degrees? To estimate the length of day,

    asked by Amy on March 9, 2013
  19. Math- Geometric solutions and problems RIA

    A. -x^3 and x^11 ; 3 B. 0.6 and -0.002025; 2 C. x^2,x^6,x^10.... (A sub 20) * sorry for the sub :D but I guess that's already clear? Hehe. D. a^2/2 , a^4/4, a^6/8.... (A sub 10) E. X+1, 2x^2 + 2x, 4x^3 + 4x^2 (A sub 6) F. 32y^2, 16y^2, 8y^2 (A sub 8) *

    asked by Ria on August 18, 2016
  20. Algebra 2

    I am trying to factor a 4th degree polynomial that does not have any rational roots. I need to somehow get it factored into two quadratics. Anyone know of a method to use. 3x^4 - 8x^3 - 5x^2 + 16x - 5 Two of the irrational roots are 1.135.. and 0.382.. but

    asked by Brenda on March 9, 2007
  21. Com 155

    I would appreciate if someone could look at the assignment I have to complete. I have included the rules I am to follow and the paragraph that I have written • Read two of the five paragraphs on the second page of this appendix. Write a brief paragraph

    asked by Debbie on April 22, 2011
  22. Physics

    An object of mass m travels halfway around a circle at a constant speed v. The magnitude of the total work done on the object by the net force acting on it (not counting starting and stopping at the beginning and end of the path) is a. equal to mv b. equal

    asked by Ramsey on June 3, 2011
  23. Physics

    A child on a sled is sliding at a speed of 4m/s across level ice. if the total mass of the sled + child is 50kg and the sled has steel runners, how long will it take the sled to come to a halt? what force will be required to start it moving again? If this

    asked by Roisin on December 15, 2015
  24. Physics

    A proton with mass 1.67×10−27 kg and charge 1.60×10−19 C accelerates from rest in a uniform electric field of strength 500 N/C. (a) What is the magnitude of the acceleration of the proton? (b) How long does it take the proton to reach a speed of

    asked by Jane on July 10, 2014
  25. Physics

    A dock worker applies a constant horizontal force of 80.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. the block starts from rest and moves 11.0 m in the first 5.00s what is the mass of the block of ice?

    asked by Sarah on June 10, 2009
  26. PHysics

    A chain consisting of five links, each of mass 0.150 kg, is lifted vertically with a constant acceleration of a = 2.2 m/s2. Find the magnitude of the force that link 3 exerts on link 2. What is the magnitude of the force F that must be exerted on the top

    asked by Steve on February 21, 2012
  27. physics

    A hammer head of mass 600g produces a force of 360N when it strikes the head of a nail. Explain how it is possible for a hammer to drive tie na4l into a piece of wood, yet a weight of 360N resting on the head of the nail would not

    asked by Anonymous on April 21, 2019
  28. Physics

    A dock worker applies a constant horizontal force of 80.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 10.0m in the first 6.00s. What is the mass of the block of ice?

    asked by Shelby on October 2, 2013
  29. College Physics

    A cable attached to a block of mass 16.35 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 9.36 N, what is the coefficient of kinetic friction between the block and the floor? not sure how to do this one

    asked by Anon on September 12, 2011
  30. physics

    a 2390 kg car traveling to the west at 22.4 m/s slows down uniformly under a force of 8740 N to the east. (a) How much force would be required to cause the same acceleration on a car of mass 3140 kg? Answer in units N (b) How far would the car move before

    asked by Bob on February 9, 2009
  31. physics

    A cherry bomb explodes into three pieces of equal mass. One piece has an initial velocity of 12m/sx^. Another piece has an initial velocity of 7.0m/sx^−5.0m/sy^. Part A What is the velocity of the third piece? Enter the x and y components of the velocity

    asked by bety on March 3, 2014
  32. Mechanics, Waves and Optics

    A crate with a total mass of 18.0 kg is pulled by a person along the floor at a constant speed by a rope. The rope is inclined at 20 degree above the horizontal, and the crate moves 20.0 m on a horizontal surface. The coefficient of kinetic friction

    asked by Anonymous on August 7, 2013
  33. Physics 203

    A 5m long diving board of negligible mass is supported by two pillars. One pillar is at the end of left of the diving board, the other is 1.50m away. Find the forces exerted by the pillars when a 90kg diver stands at the far end of the board.

    asked by ash on April 9, 2013
  34. science

    A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15

    asked by Oscar on March 30, 2015
  35. Physic

    Assume all temperatures to be exact. An aluminum spoon at 84 degree C is placed in a Styrofoam cup containing 0.180 kg of water at 12 degree C. If the final equilibrium temperature is 21 degree C and no heat is lost to the cup itself or the environment,

    asked by Alice on May 6, 2011
  36. Physics

    A puck of mass 0.165 kg, initially resting on ice, is hit by a stick to gain a speed of 32.0 m/s and then slides 25.0 m to lose 5.00% of its kinetic energy. (a) What is the work done on the puck by the stick? (b) What is the kinetic friction coefficient

    asked by Will on October 11, 2014
  37. College-Chemistry

    NaOH(s)+ H2SO4(aq)=Na2SO4(aq) + H2O(l) Consider the unbalanced equation above.A 0.900 g sample of impure NaOH was dissolved in water and required 37.0 mL of 0.145 M H2SO4 solution to react with the NaOH in the sample. What was the mass percent of NaOH in

    asked by Tiffany on February 26, 2010
  38. Biomechanics

    A pitched ball with a mass of 1 kg reaches a catcher's glove traveling at a velocity of 28 m/s. How much momentum does the ball have? how much impulse is required to stop the ball? If the ball is in contact with the catcher's glove for 0.5 s during the

    asked by Walter on November 21, 2010
  39. Physics Help

    It starts saying that impulse is related to velocity in a certain way. What is that relationship? I just said impulse = force x time and momentum = mass x velocity So would that be a correct answer to what they're wanting? Also, it says there is a

    asked by Eiban on March 27, 2014
  40. Physics

    The equation of a transverse wave travelling wave on a string is: Y=3 cos[3.14(0.5x-200t)] Where x and y in cm and t is in second. a)find the amplitude, wave length,frequency period,velocity of propagation. b)if the mass per unit length of the string is

    asked by Megha on March 3, 2016
  41. Physics

    a sled mass 50 kg is pulled along snow-covered, flat group. the static friction coefficent is 0.30, and the sliding friction coefficient is .10. what force is need to get the sled moving? then, what force is needed to keep the sled moving at a constant

    asked by Alex on November 28, 2010
  42. Math

    There was a sample of 550 milligrams of a radioactive substance to start a study. Since then, the sample has decayed by 5.2% each year. Let t be the number of years since the start of the study. Let y be the mass of the sample in milligrams. Write an

    asked by Anonymous on March 19, 2017
  43. chemistry

    Calculate the following quantities. (See the periodic table.) (a) mass, in grams, of 2.54 10-2 mol of CdS g (b) number of moles of NH4Cl in 90.0 g of this substance mol (c) number of molecules in 5.081 10-2 mol C6H6 molecules (d) number of O atoms in 4.72

    asked by Anonymous on August 2, 2012
  44. Chemistry 20

    A student was experimentally checking the stoichiometry of a reaction. The student correctly predicted that the reaction should produce 1.82 g of al2(so4)3(s). When the student dried and weighed the al2(so4)3(s) produced, its mass was 1.94 g. The percent

    asked by Tala on November 20, 2016
  45. Physics

    What must the charge (sign and magnitude) of a particle of mass 1.48g be for it to remain stationary when placed in a downward-directed electric field of magnitude 670N/C ? What is the magnitude of an electric field in which the electric force on a proton

    asked by Wayne on September 3, 2013
  46. Physics

    A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4  106 m, mass = 6.0  1024 kg)

    asked by Annie on November 18, 2012
  47. Chemistry 1201

    When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)->CaO(s)+CO2(g) What is the mass of calcium carbonate needed to produce 53 L of carbon dioxide at STP?

    asked by John on April 15, 2012
  48. Physics

    A car of mass 422 kg is moving 36.0° North of East at a speed of 15.4 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction). What is the east-west component of the momentum of the car? I already figured out

    asked by Emily on March 15, 2016
  49. physics

    A girl pulls a toy train with a horizontal force of 10N The tention between the locomotive and the carrdge is 3N the friction on the carrydgers in and the mass of the locomotive and carrydge are 2 kg and 1kg respectively now calculate the acceleration of

    asked by Anonymous on February 2, 2011
  50. physics

    At t = 0 a block with mass M = 5 kg moves with a velocity v = 2 m/s at position xo = -.33 m from the equilibrium position of the spring. The block is attached to a massless spring of spring constant k = 61.2 N/m and slides on a frictionless surface. At

    asked by stewart on December 1, 2014
  51. Physics

    A lamp hangs vertically from a cord in a descending elevator with a constant deceleration a. If the tension in the cord is T0, answer the following. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What is the lamp's

    asked by Rachel on February 11, 2013
  52. physics help

    The distance between the midponts of two metal balls.P and Q,respectively of masses 55 kg and 70 kg is 80 cm calculate the gravitational force that P exerts on Q7 (b)give only the magnitude of the force that Q exerts on P (c)if Q Is now replaced by a ball

    asked by kem on October 12, 2015
  53. physics

    In a circus performance, a monkey on a sled is given an initial speed of 3.9 m/s up a 17 ◦ incline. The combined mass of the monkey and the sled is 18.1 kg, and the coefficient of kinetic friction between the sled and the incline is 0.34. The

    asked by Anonymous on December 17, 2012
  54. chemistry

    Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps

    asked by anonymous on February 17, 2010
  55. Chemistry

    Consider titrating an unknown chloride sample with 0.10 +/- 0.01M AgNO3 and the following data: Initial Buret reading-0.19 +/- 0.02mL Final Buret reading- 9.26 +/- 0.03mL Unknown sample mass- 95.0 +/- 0.2mg Find the weight 5 of Cl- in the sample.

    asked by Stephanie on February 12, 2013
  56. physics (work shown)

    A 0.63-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstrained length quadruples. What is the mass of the second block? My work

    asked by Sarah on November 17, 2010
  57. chemistry

    Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 x 10-3

    asked by charles on May 26, 2014
  58. Physics - fluids

    A solid cylinder (radius = 0.170 m, height = 0.150 m) has a mass of 7.00 kg. This cylinder is floating in water. Then oil (ñ = 0.866 kg/m3) is poured on top of the water until the situation shown in the drawing results. How much of the height of the

    asked by Erin on November 24, 2009
  59. chemistry

    The mass percentage of chloride ion in a 29.00 sample of seawater was determined by titrating the sample with silver nitrate, precipitating silver chloride. It took 42.42 of 0.2998 silver nitrate solution to reach the equivalence point in the titration.

    asked by Cecelia on October 4, 2011
  60. physics

    Determine what the theoretical slope of the graph is (for example the slope of a distance vs. time graph is velocity); be sure to show all work. So, I had to make a weight vs. mass graph which i did, and i also found its numeric value for the slope. I

    asked by Anonymous on October 20, 2011
  61. Physics

    A solid cylinder (radius = 0.150 m, height = 0.120 m) has a mass of 7.00 kg. This cylinder is floating in water. Then oil ( = 725 kg/m3) is poured on top of the water until the situation shown in the drawing results. How much of the height of the cylinder

    asked by mark on November 6, 2007
  62. Pre-calculus

    Initially 600 milligrams of a radioactive substance was present. After 7 hours the mass had decreased by 3%. Construct an exponential model A(t) = A0ekt for the amount remaining of the decaying substance after t hours. Find the amount remaining after 24

    asked by Kim on November 23, 2015
  63. Physics

    A father skating pushes a baby in a cart over a distance of 100m. The father starts from rest and wants to reach a speed of 5.0m/s, How hard does the father need to push in the direction of the motion? The cart has a mass of 10.0kg and the baby is 8.0kg.

    asked by Anonymous on October 31, 2018
  64. Physics

    A harmonic wave in a wire has amplitude A = 7.6 mm, wavelength λ = 0.679 m and frequency f = 543 Hz. What is the propagation speed of the wave? Answer in units of m/s. The wire has linear mass density of 5.04 g/m. Determine the wire’s tension. Answer in

    asked by Aj on October 21, 2012
  65. physics

    A thin 2.82 m long copper rod in a uniform magnetic field has a mass of 44.2 g. When the rod carries a current of 0.238 A, it floats in the magnetic field. The acceleration of gravity is 9.81 m/s2 . What is the field strength of the magnetic field? Answer

    asked by maria on April 19, 2011
  66. Chemistry

    For the reaction 2H2 + 1O2 à 2H2O, there are 8.08 grams of H2 available. 2. Use the ratio of stoichiometric coefficients in the reaction above to determine how many moles of H2O can be produced from the H2 available. Then, use molar mass to convert the

    asked by Feather on September 13, 2014
  67. PHYSICS

    A thin 2.82 m long copper rod in a uniform magnetic field has a mass of 44.2 g. When the rod carries a current of 0.238 A, it floats in the magnetic field. The acceleration of gravity is 9.81 m/s2 . What is the field strength of the magnetic field? Answer

    asked by Leslie on April 19, 2011
  68. Chemistry

    Which statement is true for the cell as it discharges? Zn | Zn2+(1 .0 M) || Sn2+(1.0 M) | Sn (A) Oxidation occurs at the tin electrode. (B) Electrons will flow from the tin electrode to the zinc electrode. (C) The concentration of Zn2+ will increase. (D)

    asked by LT on May 12, 2008
  69. British lit

    I need help with a few questions. They need to be answered to help me write an essay on Neoclassicism. Please help me. Thank you! 1. Throughout his career, critics accused John Dryden of catering to people in political power. Does Annus Mirabilis fit this

    asked by Alexis on June 17, 2015
  70. Physics

    A car with a mass of 100 kg, with initial v = 1 m/s, has 60 Joules of energy added for 50 m. What is the final velocty? I'm using KE = 1/2 mv^2 to find initial KE. Then add 600 J to this for the final KE. Thus, W = KFf - KEi; KEf = W + KEi and KEf =

    asked by Jack on January 17, 2010
  71. Physics

    A train has a mass of 5.22 multiplied by 106 kg and is moving at 70.0 km/h. The engineer applies the brakes, which results in a net backward force of 1.87 multiplied by 106 N on the train. The brakes are held on for 37.0 s. (a) What is the new speed of the

    asked by Seth on October 2, 2011
  72. Science

    A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15

    asked by Callie on November 6, 2014
  73. Chemistry

    Vitamin K is involved in normal blood clotting. When 2.40 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 8.05 °C. The freezing point and Kf constant for camphor can be found here. Calculate the molar

    asked by Shardai on October 16, 2013
  74. Chemistry

    Three samples of an unknown acid are titrated with 0.4901 M NaOH. The average equivalent weight of the acid using the data below is g/equiv mass of unknown vol NaOH trial 1: 1.02 27.72 trial 2: .522 14.22 trial 3: .742 20.02

    asked by confused on April 2, 2008
  75. physics

    Q: A block A of mass 0.5 kg can slide on a frictionless incline of angle 30o and length 0.8 m kept inside an elevator going up with uniform velocity 2m/s. Find the time taken by the block to slide down the length of the incline if it is released from the

    asked by mohit on August 5, 2015
  76. Chemistry

    Having obtained the voume of the flask, she emptied the flask, dried it and filled it with an unknown whose density she wished to determine. The mass of the stoppered flask when completely filled with liquid was 56.796g. Find the density of the liquid.

    asked by Anonymous on August 22, 2013
  77. Chemistry

    When 3.10 g of a nonelectrolyte solute is dissolved in water to make 755 mL of solution at 26 °C, the solution exerts an osmotic pressure of 821 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is

    asked by LLamaboy on February 4, 2014
  78. PHYSICS

    A 2.5 g ice flake is released from the edge of a hemispherical bowl whose radius r is 40.0 cm. The flake-bowl contact is frictionless. (a) What is the speed of the flake when it reaches the bottom of the bowl? (b) If a second flake with twice the mass was

    asked by Anonymous on October 21, 2011
  79. Physics

    A heavy rainstorm dumps 1.0 cm of rain on a city 8 km wide and 9 km long in a 2 hour period. How many metric tons (1 metric ton = 10^3 kg) of water fell on the city? (1 cm^3 of water has a mass of 1g = 10^-3 kg) What I have thus far: 72 km^2 x (1E^10

    asked by Anonymous on August 26, 2016
  80. Physics

    A sled and rider, gliding over horizontal, frictionless ice at 4.9{\rm m/s} , have a combined mass of 86{\rm kg} . The sled then slides over a rough spot in the ice, slowing down to 2.1{\rm m/s} What impulse was delivered to the sled by the friction force

    asked by Cassie on November 13, 2012
  81. Chemistry

    A 255mL gas sample contains argon and nitrogen at a temperature of 65 degrees celsius. The total pressure of the sample is 725mmHg and the partial pressure of argon is 231 mmHg. what mass of nitrogen is present in the sample?

    asked by Mark on October 17, 2015
  82. simple harmonic motion

    A 50-g mass is attached to a spring and undergoes simple harmonic motion. Its maximum acceleration is 15m/s2 and its maximum speed is 3.5m/s . Determine the angular frequency. Determine the spring constant. Determine the amplitude of the motion.

    asked by little wayne on December 4, 2014
  83. Science HELP

    A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15

    asked by Callie on November 6, 2014
  84. Chemistry

    Vitamin K is involved in normal blood clotting. When 2.32 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 7.78 °C. The freezing point and Kf constant for camphor can be found here. Calculate the molar

    asked by Abdul on December 7, 2014
  85. chemistry

    A 50.00-mL sample of groundwater is titrated with 0.0900 M EDTA. Assume that Ca2 accounts for all of the hardness in the groundwater. If 11.40 mL of EDTA is required to titrate the 50.00-mL sample, what is the hardness of the groundwater in molarity and in

    asked by Ashley on April 4, 2013
  86. PHYSICS

    1kg of fat is equal to 30MJ of energy.the efficiceny of converting fat to energy is 20%. suppose you life a mass of 12kg 2.0m vertically,500 times, how much work do you do? if all the energy used to do the work comes from the burning fat how much fat is

    asked by Riana on April 1, 2013
  87. chemistry

    A sample of nickel is heated to 95.0°C and placed in a coffee-cup calorimeter. If the 50.0 g of water in the calorimeter is initially 22.3°C and warms to 25.4°C, what mass of nickel was heated? (The specific heat of nickel is 0.444 J/°C g and water is

    asked by Morgan on December 10, 2014
  88. physics

    A flag of mass 2.2 kg is supported by a single rope as shown in the figure below. A strong horizontal wind exerts a force of 10 N on the flag. Find the tension in the rope and the angle θ the rope makes with the horizontal. Tension = N θ = °

    asked by kj on February 21, 2009
  89. physics

    the speed of the fastest pitched baseball was 45 m/s, and the ball's mass was 145 g. (a) What was the magnitude of the momentum of this ball, and how many joules of kinetic energy did it have? (b) How fast would a 57 gram ball have to travel to have the

    asked by sarah on October 28, 2009
  90. physics

    In the simulation above the motion continues for 3 seconds. If the object travels a distance of 21.3 m in that time determine: (a) the acceleration of the object during the 3 second period, (b) the maximum speed of the object during the 3 second period.

    asked by Sam on October 11, 2010
  91. chemistry

    You have a solution that contains 0.25g grams of oxalic acid dissolved in 100 mL of water. This solution is placed in a separating funnel, and the 100 mL of butanol is added to the solution. calculate the mass of oxalic acid in the organic solvent

    asked by Grace on June 16, 2016
  92. Analytical Chem

    Describe the preparation of 100 mL 0.50 M solution of Fe(NO3)3 from a stock solutiion that is 60%(w/w)Fe(NO3)3 solution with a specific gravity of 1.110 g/ml. Calculate the molar NO3 concentration in the resulting solution. Molar Mass of Fe(NO3)3: 241.86

    asked by BabyMikee on April 18, 2012
  93. Chemistry

    When 3.15 g of a nonelectrolyte solute is dissolved in water to make 135 mL of solution at 21 °C, the solution exerts an osmotic pressure of 869 torr. What is the molar mass of the solute? What is the molar concentration of the solution? How many moles of

    asked by Tsomo on July 6, 2014
  94. physics

    A satellite has a mass of 5850kg and is in a circular orbit 4.1*10^5m above the surface of a planet. The period of the orbit is two hours. the radius of the planet is 4.15*10^6m.What is the true weight of the satellite when it is at rest on the planet's

    asked by ajo on December 2, 2007
  95. Physics

    While sliding horizontal on a frictionless surface at a speed of 30 m/s, a hockey puck of mass 0.16 kg is struck by a hockey stick. After leaving the stick, the puck has a speed of 22 m/s in the opposite direction. The magnitude of the impulse given to the

    asked by Samiboo711 on February 2, 2015
  96. Science 8R - Homework Qs. Check

    If an object has mass of 70.5g and a volume of 64 cm(3), what is its Density? Will it sink or float and why? Answer - The Density of this object is 4512g/cm(3). It will sink because the amount of grams is a lot. Is the answer correct and good???? I

    asked by Laruen on October 15, 2012
  97. Chem 2

    When 3.89 g of a nonelectrolyte solute is dissolved in water to make 835 mL of solution at 26 °C, the solution exerts an osmotic pressure of 825 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is

    asked by Bri on February 20, 2014
  98. Physics

    A construction hoist does 2.74x10⁴J of work in lifting a load of bricks from the street to the roof of a building. The roof is 9.46m above the street. Calculate the mass of a load of bricks. The load is moving at a constant rate

    asked by physics on October 30, 2018
  99. Chemistry Science

    A piece of iron with a mass of 35 g is heated to 1305oC and then placed in a calorimeter containing 600 g of water. The temperature of the water increases from 25oc to 33oC. The specific heat of water is 4.184 J/g X C. Calculate the specific heat of the

    asked by vvfrn on May 27, 2012
  100. astronomy

    A body has four times the mass of the Earth but its radius is two times larger. What is the acceleration of gravity on the surface of this planet? If you were on this planet, should you be able to jump (on average) farther distances, shorter distances or

    asked by Gail on March 6, 2012

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