1. physics

    juana slides a crate along the floor of the moving van the coefficient of kinetic friction between the crate and van floor is 0.120 the crate has a mass of 56.8 kg and juana pushes with horizontal force of 124 N. if 74.4 J of work are done on crate and the

    asked by Mark on May 11, 2011
  2. physics

    Three forces acting on an object are given by F1 = ( - 1.85i + 2.50j) N, F2 = ( - 5.10i + 3.25j ) N, and F3 = ( - 45.0i + 48.0j ) N. The object experiences an acceleration of magnitude 3.75 m/s2. (a) What is the direction of the acceleration? _________°

    asked by anonymous on March 3, 2010
  3. Physics

    juana slides a crate along the floor of the moving van the coefficient of kinetic friction between the crate and van floor is 0.120 the crate has a mass of 56.8 kg and juana pushes with horizontal force of 124 N. if 74.4 J of work are done on crate and the

    asked by Mark on May 11, 2011
  4. Microeconomics

    Bob and Jane decide to open their own business selling ergonomically correct office furniture that Jane has designed. Assume they operate this business from leased office space near their home. Also assume that they lease their computer equipment and data

    asked by Adam on February 26, 2009
  5. physics

    "The actual value of computed g, assuming no drag, also varies somewhat over the earth's surface due to the earth's spin (which causes a latitude-dependent centrifugal force to get subtracted), lack of a perfect spherical shape of the earth, and the

    asked by physics on August 13, 2009
  6. I need help..

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is

    asked by Morgan Stevenson on January 7, 2013
  7. Science Somebody Help Me Please..I have a deadline

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is

    asked by Morgan S on January 7, 2013
  8. Please guys. Help me out.

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is

    asked by Morgan Stevenson on January 7, 2013
  9. Will somebody help me please?

    1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is

    asked by Morgan Stevenson on January 8, 2013
  10. Physics

    In a skating stunt known as "crack-the-whip", a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 76.7 kg and is 6.18

    asked by Emily on March 29, 2016
  11. Physics help pls

    Pls help me I have a test tmrw A block with mass 5kg slides along a horizontal floor under the action of a force 20N applied upward at an angle θ to the horizontal. The coefficient of kinetic friction between the block and the floor is μk = 0.4. Find the

    asked by Jamila on March 21, 2016
  12. physics

    A baseball bat hits a ball with an average force of 970N that acts for 0.0088s. a) what impulse was given to the ball/ b)What was the change of momentum of the ball? c)The ball was hit back in the same direction that it came from. If its speed before being

    asked by flirtyme on January 13, 2018
  13. physics

    In a skating stunt known as crack-the-whip, a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 80.0 kg and is 5.35 m

    asked by Anonymous on November 6, 2012
  14. Physics

    In a skating stunt known as "crack-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 73.0 kg and is 7.70

    asked by Kara on March 15, 2011
  15. Physics

    A block of mass m lies on a rough plane which is inclined at an angle è to the horizontal. The coefficient of static friction between the block and the plane is ì. A force of magnitude P is now applied to the block in a horizontal direction, towards the

    asked by Anonymous on May 13, 2012
  16. Chem

    What mass of nickel is dissolved in 100. mL of saturated nickel (II) hydroxide? (Ksp = 1.6 X 10^-16) How do I do this? Please don't use different names. It helps us to know what we have already told you in other problems if we have some consistency with

    asked by HELP ME on May 6, 2007
  17. Chemistry

    The standardized NaOH solution was determined to be 120M whereas the mass of the sample of impure tartaric acid was 1.35g. If the initial reading of the buret volume changed from 48 ml to a final reading of 17 ml at the endpoint of the titration of the

    asked by Jonah on February 28, 2013
  18. Science

    Magnesium oxide is not very soluble in water, and is is difficult to titrate directly. It's purity can be determined by use of a back-titration method. 4.06 g of impure magnesium oxide was completely dissolved in an excess of 0.20 mol/L for neutralization.

    asked by Cleopatra on March 31, 2019
  19. chemistry

    A 18.3 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 82.4oC and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/goC) initially at 22.3oC. The final temperature of the water is

    asked by mathew on November 18, 2014
  20. Physics

    A uniform crate with a mass of 16.2 kg rests on a floor with a coefficient of static friction equal to 0.571. The crate is a uniform cube with sides 1.21 m in length. what is the minimum height where the force F can be applied so that the crate begins to

    asked by AfterLife on July 27, 2011
  21. Physics

    A simple pendulum consists of a light string 1.70 m long with a small 0.490 kg mass attached. The pendulum starts out at 45º below the horizontal and is given an initial downward speed of 1.50 m/s. find: At the bottom of the arc, determine the centripetal

    asked by Luis on June 25, 2011
  22. Physics

    You decide to make a simple pendulum by attaching a bowling ball to a very light wire and suspending it from the ceiling in your garage. The length of the wire is 1.75 m and the mass of the bowling ball is 5 kg. If you pull the bowling ball back an angle

    asked by John Smith on July 22, 2013
  23. Physics

    1. A certain playground merry-go-round is essentially an 90-kg iron disk 2.0 m in radius. Two children, each with a mass of 46 kg, are originally standing on opposite sides of the disk near its outer edge. The merry-go-round is turning essentially without

    asked by Jordan on May 6, 2011
  24. PHYSICS

    An object of mass M = 1,284 g is pushed at a constant speed up a frictionless inclined surface which forms an angle θ = 50 degrees with the horizontal. What is the magnitude of the force that is exerted by the inclined surface on the object? (I'm using

    asked by Mar on October 14, 2010
  25. Physics

    A pinball machine uses a spring that is compressed 4.0 cm to launch a ball. If the spring constant is 13 N/m, what is the force on the ball at the moment the spring is released? I don't understand this I guess... Does the ball leave the spring at the

    asked by HELP ME! on May 16, 2009
  26. chemistry

    Calculate the mass of ethanol that must be burnt to increase the temperature of 150g of water by 75 degrees celsius, if exactly 75% of the heat released by this combustion is lost to the surroundings. Also it is given that the heat of combustion of ethanol

    asked by Isabella on February 7, 2015
  27. CHEM

    Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1

    asked by Marrion on October 20, 2009
  28. Chemistry

    A biochemical engineer isolates a bacterial gene fragment and dissolves a 15.1 mg sample of the material in enough water to make 32.7 mL of solution. The osmotic pressure of the solution is 0.340 torr at 25°C. a) What is the molar mass of the gene

    asked by Pooja on February 11, 2015
  29. Physics

    Some insects can walk below a thin rod (such as a twig) by hanging from it. Suppose that such an insect has mass m and hangs from a horizontal rod as shown in the figure, with angle θ = 37°. Its six legs are all under the same tension, and the leg

    asked by Robin on February 17, 2014
  30. Chemistry

    A sample of impure magnesium was analyzed by allowing it to react with excess HCl solution: Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) After 1.27 g of the impure metal was treated with 0.100 L of 0.768 M HCl, 0.0125 mol HCl remained. Assuming the impurities

    asked by James on September 22, 2013
  31. chemistry

    I need to calculate the pressure exerted by the hydrogen in an eudiometer for a weighing by redox lab. mass of Mg: .021 g temp: 295K barometric pressure: 29.87 inches Hg volume of H2 gas: the difference between tiop water level in eudiometer = 322 mm the

    asked by Rebekah on October 25, 2007
  32. chemistry

    I need to calculate the pressure exerted by the hydrogen in an eudiometer for a weighing by redox lab. mass of Mg: .021 g temp: 295K barometric pressure: 29.87 inches Hg volume of H2 gas: the difference between tiop water level in eudiometer = 322 mm the

    asked by Rebekah on October 25, 2007
  33. Physics

    A dockworker applies a constant horizontal force of 73.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 11.5m in a time 5.40s . a.) What is the mass of the block? b.)If

    asked by Mike on February 7, 2014
  34. Physics CENTER OF MASS

    A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00

    asked by Jesse on April 10, 2016
  35. Physics

    A large turntable rotates about a fixed vertical axis, making one revolution in 6.00 s. The moment of inertia of the turntable about this axis is 1200 kg * mg^2. A childe of mass 40.0 kg, initually staning at the center of the turntable, runs out along a

    asked by Sarah on June 25, 2009
  36. physics

    In a skating stunt known as "crack-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 69.0 kg and is 5.50

    asked by heather on February 23, 2011
  37. physics

    An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 68.7 cm long and has a mass of 4.69 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Torque = massball x

    asked by Vishnu on October 11, 2008
  38. Physics

    A large turntable rotates about a fixed vertical axis, making one revolution in 6.00 s. The moment of inertia of the turntable about this axis is 1200 kg * mg^2. A childe of mass 40.0 kg, initually staning at the center of the turntable, runs out along a

    asked by Sarah on June 25, 2009
  39. Physics

    The star has a mass n_1 times that of the planet, which orbits this star. For a person on the planet, the average distance to the center of the star is n_2 times the distance to the center of the planet. In magnitude, what is the ratio of the star's

    asked by Tifani on April 10, 2007
  40. Chemistry

    In the dehydrogenation of ethane two reactions take place: C2H6 => C2H4 + H2 C2H6 + H2 => 2CH4 The mass distribution of the product is: 27% C2H6; 33% C2H4; 13% H2; 27% CH4. 1. What was the conversion of C2H6 to CH4? 2. What was the yield of C2H4 expressed

    asked by Hoang on November 24, 2016
  41. physics

    The magnitude of each force is 283 N, the force on the right is applied at an angle 41 and the mass of the block is 27 kg. The coefficient of friction is 0.283. The acceleration of gravity is 9.8 m/s2 . 27 kg μ = 0.283 283 N 41 degrees 283 N What is the

    asked by james on November 10, 2013
  42. Physics

    Heyy is anybdy good at physics I am stuck on this question ... ... A camper van with a mass of 2500 kg has a maximum driving force of 2650 N. The camper van drives along a straight road at a constant speed of 90 kilomatres per hour. At this speed, air

    asked by Robyn on September 9, 2011
  43. Physics

    A small bead of mass m is free to slide along a long, thin rod without any friction. The rod rotates in a horizontal plane about a vertical axis passing through its end at a constant rate of f revolutions per second. Show that the displacement of the bead

    asked by 0255872 on February 11, 2011
  44. physics

    help me please? I'm lost... A small space probe is put into circular orbit about a newly discovered moon of Saturn. The moon's radius is known to be 550km. If the probe orbits at a height of 1500km above the moon's surface and takes 2.0 earth days to make

    asked by Ricky on December 5, 2017
  45. physics

    A horizontal disc rotating freely about a vertical axis makes 90 revolutions per minute. A small piece of wax of mass “m” falls vertically on the disk & sticks to it at a distance “r” from the axis. If the number of revolutions reduces to 60, then

    asked by hriday on December 30, 2008
  46. Chemistry

    An analytical chemist weighs out 0.225g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with distilled water. He then titrates this solution with 0.0700M NaOHsolution. When the titration reaches the equivalence point, the

    asked by Audrey on November 14, 2016
  47. Physics

    The roller coaster starts with a velocity of 16 m/s. One of the riders is a small girl of mass 26 kg. Find her apparent weight when the roller coaster is at locations B and C. At these two locations, the track is circular, with the radii of curvature

    asked by R on May 8, 2013
  48. Physics GR12

    A bungee jumper of mass 75kg is stadnding on a platform 53m above a river. The length of the unstretched bungee cord is 11m. The spring costant is 65.6N/m. Calculate the jumper's speed at 19m below the platform on his first fall. [Also, please state which

    asked by Sophie on December 4, 2013
  49. Chemistry (Check)

    Completion 1)Metric 2)Five 3)Meter 4) 5)Weight The International System of Units (SI) is a revision of the ___1____ system. There are __2____ SI base units. In SI, the base unit of length is the ___3____. The Space taken up by a cube that is 10cm on each

    asked by Bryan on January 18, 2007
  50. Physics

    A small bead of mass m is free to slide along a long, thin rod without any friction. The rod rotates in a horizontal plane about a vertical axis passing through its end at a constant rate of f revolutions per second. Show that the displacement of the bead

    asked by Roger Cole on February 10, 2011
  51. physics

    help me please? I'm lost... A small space probe is put into circular orbit about a newly discovered moon of Saturn. The moon's radius is known to be 550km. If the probe orbits at a height of 1500km above the moon's surface and takes 2.0 earth days to make

    asked by Ricky on December 5, 2017
  52. College Physics

    A small bead of mass m is free to slide along a long, thin rod without any friction. The rod rotates in a horizontal plane about a vertical axis passing through its end at a constant rate of f revolutions per second. Show that the displacement of the bead

    asked by Roger Cole on February 13, 2011
  53. physics

    A triple beam balance, like the scales we use every week in lab, works using rotational equilibrium. If a 253 g mass is placed on the pan, 1 cm from the pivot, and there are three masses, 1 g, 10 g, and 50 g masses on the other side can be slid back and

    asked by John on October 18, 2014
  54. Math

    Global Telephone charges 30 dollars for monthly phone service, plus a long distance calling rate of 15 cents per minute. After an hour of long distance calling charges,the rate drops to just 5 cents per minute for additional long distance calls. What will

    asked by Kris on August 2, 2011
  55. Physics

    12th grade physics ap question. A baseball with a mass of 120 g is hit 21.8 m into the air. The ball is caught by the third baseman 2.5 m above the ground. What potential energy did the ball develop at its highest point? How much potential energy did it

    asked by Ravin on October 24, 2012
  56. physics- electricity

    An electric car uses a lithium metal hydride battery with a mass of 250 kg. The battery delivers 300v and holds a stored charge q of 70 ampere-hours. Calculate the total energy stored in the battery in kWh. Calculate the number of gallons of gas that would

    asked by Anonymous on February 27, 2013
  57. chemistry

    If 146 g of Pb(NO3)2 reacts stoichiometrically according to the balanced equation, how many grams of solid PbI2 are produced? Pb(NO3)2(aq) + 2NaI(aq) ¡æ PbI2(s) + 2NaNO3(aq) Molar Mass (g/mol) Pb(NO3)2 331.21 PbI2 461.00 Molar Volume (L) 22.4 at STP Gas

    asked by Judy on June 2, 2010
  58. physics

    We release an oil drop of radius r in air. The density of the oil is 640 kg/m3. C1 and C2 for 1 atmosphere air at 20∘ C are 3.90 × 10−4 (kg/m)/sec and 0.73 kg/m3, respectively. How small should the oil drop be so that the drag force is dominated by

    asked by Help, please! on October 15, 2013
  59. Physics

    The figure below shows a standard man intending to do reverse curls in a gym (standing up with Tension up, weight of arm down and force down). He holds his arms straight, using an overhand grip to hold the bar. If the mass of the bar is given as 146 kg,

    asked by Dean on October 2, 2009
  60. chem 101

    60F is 15.55 C 180 F is 82.22C delta T = 82.22-15.55 = 66.67 q = mass x specific heat x delta T q = 100g x 4.184 x 66.67 q = 278,947 = 279 kJ. Burning alcohol (46 g ethanol) provides 1238.43 kJ/mol. We want to know how many g ethanol to burn to provide 279

    asked by Anonymous on April 16, 2012
  61. physics

    We release an oil drop of radius r in air. The density of the oil is 640 kg/m3. C1 and C2 for 1 atmosphere air at 20∘ C are 3.90 × 10−4 (kg/m)/sec and 0.73 kg/m3, respectively. How small should the oil drop be so that the drag force is dominated by

    asked by Help!! on October 15, 2013
  62. woburn

    We consider a man of mass m = 77 kg as shown in the figure below using crutches. The crutches each make an angle of è = 26 with the vertical. Half of the person's weight is supported by the crutches, the other half is supported by the normal forces acting

    asked by shariva on October 4, 2010
  63. chemistry

    a sucrose solution with a volume of B uL has a density of C g/ml. the solution is D % sucrose by mass. if i added x ml of this sucrose to another solution, how many grams sucrose did I add?a sucrose so

    asked by neece on January 24, 2012
  64. someone correct my work please? fun, fun chemistry

    Okay. I'm very, very confused. The initial question is: predict the products of the electrolysis of a 1 mol/L solution sodium chloride. This is my work: The four different possible equations are: 2H2o + 2e- -------> H2 + 2OH- (V= -0.83) O2 + 4H+ + 4e-

    asked by Rienna on January 30, 2007
  65. Physics/Math

    You drop a 1.8 kg textbook to a friend who stands on the ground 9 m below the textbook with outstretched hands 1.50 m above the ground. (a) What is the speed of the textbook when it reaches the hands? m/s (b) If we substituted a second textbook with twice

    asked by Technoboi11 on March 7, 2007
  66. Chemistry

    Lactic acid, a chemical responsible for muscle fatigue, is a monoprotic acid. When 0.578 g of lactic acid is titrated with 0.206 M NaOH, a volume of 31.11 mL of NaOH is used. What is the molar mass of lactic acid? HA + NaOH > NaA + H2O (also does the A

    asked by Naomi on March 3, 2018
  67. physics

    A small block of mass 42 kg slides along a frictionless loop-the-loop track. The radius of the loop is 5 meters. At what height above the bottom of the track should the block be released from so that it just makes it through the loop-the-loop without

    asked by Anonymous on March 7, 2014
  68. Physics

    Cn u plz gv explaination 2 d solutions steps by steps briefly? Cz i really dnt understand hw 2 apply d formula wen i revise it nw. [g=10 ms^-2 ] Two particles P & Q, of masses 0.2 kg & m kg respectively, are attached to the ends of a light inextensible

    asked by LingSpirit on September 29, 2008
  69. Algebra

    Given a line containing the points(1,4), (2,7) and (3,10) determine that slope-intercept form of the equation, provide one additional point on this line, and graph the funtion. Start by putting the first point into point-slope form: y-y1=m(x-x1), so

    asked by delmore on January 7, 2007
  70. physics

    A 2.606 kg block is on a horizontal surface with ìk = 0.160, and is in contact with a lightweight spring with a spring constant of 577 N/m which is compressed. Upon release, the spring does 7.212E-1 J of work while returning to its equilibrium position. I

    asked by help on November 23, 2010
  71. AP Physics - Linear Momentum

    During a Chicago storm, winds can whip horizontally at speeds of 100 km/h. If the air strikes a person at the rate of 40 kg/s per square meter and is brought to rest, estimate the force of the wind on a person. Assume the person is 1.50m high and 0.50m

    asked by Henry on October 16, 2009
  72. math

    1)Find the third iterate x3 of f(x)=x2-4 for an initial value of x0=2 A)-4 B)4 C)12 D)-12 I chose C 2)Use Pascal's triangle to expand:(w-x)5 This ones long so I chose w5-5w4x+10w3x3-10w2x4+5wx4-x5 3)Use the binomial Theorem to find the third term in the

    asked by Jon on December 13, 2007
  73. Physics

    posted this question this morning but I'm not sure of the response Damon provided. I did it once but then I updated it later in this at the bottom- please check booth of my answers. If you were in a rotor style ride and the riders accelerate until the

    asked by Joey on December 7, 2010
  74. Science Chemistry

    A sample of beer is 4.6% by Mass C2H5OH. The density of beer is 0.93 g/mL. What is the molar concentration of C2H5OH in this sample of beer?

    asked by Kay on June 12, 2016
  75. science

    a dog has a moment of 60 kilogram meters per second west. The dog has a velocity 3 meters per second west. What is the mass of the dog ?

    asked by roderick on October 6, 2011
  76. general chemistry II

    Phosphoric Acid is usually obtained at an 85% phosphoric acid solution, by mass. If this solution is 15 M, what is the density of the solution? What is its MOLALITY?

    asked by JL on January 29, 2014
  77. math

    By mass a certain material is 75% sand and another is 30% sand. How many tonnes of each must be mixed in order to have 250 tonnes of material that is 50% sand?

    asked by Mat on April 11, 2015
  78. chemistry

    You have a 12.01 g sample of carbon. The average mass of a carbon atoms is 1.994 x 1023 g. How many carbon atoms are in the sample?

    asked by Sam on March 1, 2011
  79. Science

    The mass of 1 liter of water is approximately 1000g. If you consume 1 liter of water,ow many water molecules did you consume?

    asked by Kelley on April 20, 2015
  80. denstiy

    density is (g/cm^3) when if you have a volume of mL? If you want to find the mass from density and volume, do you have to convert the volume to liters? mL is the same as a cm^3 1 gram/ml= 1 gram/cm^3

    asked by Ky on February 21, 2007
  81. Physics

    The radius of the planet Venus is nearly the same as that of the earth, but its mass is only 80% that of the earth, if an object weighs we on the earth, what does it weighs on Venus?

    asked by Joseph on October 21, 2018
  82. Chemistry

    The molarity of H3PO4 is .01 M. The density of the H3PO4 in the solution is .0009 g/mL. What is the mass percent of H3PO4 in the solution, which has a density of 1.11 g/ml?

    asked by Anonymous on February 18, 2014
  83. chem

    vinegar is 5.0% acetic acid, CH3COOH, by mass. vinegar has a density of 1.02 g/ml what is the madd of acetic acid in 50.0 ml of vinegar?

    asked by Anonymous on October 18, 2010
  84. chemisrty

    Q4) Suppose you prepare 950 mL of a solution by dissolving 100 grams of NaCl in 900 mL of water. Assuming the density of pure water to be 1 g/mL, answer the following questions with regards to this solution: a) What is the mass percent of water in this

    asked by lyan on January 16, 2012
  85. chem

    A hemoglobin molecule (molar mass =65000 g) can bind up to 4 oxygen molecules. In a certain experiment a .085-L solutoin containing 6.0 g of deoxyhemoglobin was reacted with excess of oxygen in a constant-pressure calorimeter of negligible heat capacity.

    asked by Mischa on October 4, 2008
  86. Physics

    A building has a symmetric roof made from two straight sections at an angle of 20‹ above the horizontal. The sides are uniform and have a mass of m = 1800 kg. Find the magnitude of the horizontal force that this roof exerts at the top of the wall,

    asked by Lou-Anne on November 11, 2007
  87. physics

    2 cars of equal mass m collide at an intersection. Driver E traveled eastward and driver N northward. After the collision, 2 cars remain joined together and slide, before coming to a rest. Police measured the skid mark length d to be 9metres. Coefficient

    asked by Kim on May 3, 2007
  88. Physics-is this correct?

    Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will

    asked by Tracy on March 11, 2012
  89. Physics

    In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did

    asked by Kevin on April 19, 2016
  90. chemistry

    Find the mass of water (H2O) needed to react with 150 grams of potassium (K) 2K(s) + 2 H2O (g)-2KOH +H2(g) How do I get the number of moles in H2O? Desperate to understand this. I got K= 150g./39.0983=3.84 mols of K. Then would it be 3.84(2mols H2O/7.68)

    asked by Teresa on October 27, 2014
  91. Physics

    In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did

    asked by Kevin on April 19, 2016
  92. physics

    Consider the system shown in the figure below with m1 = 30.0 kg, m2 = 13.7 kg, R = 0.110 m, and the mass of the pulley M = 5.00 kg. Object m2 is resting on the floor, and object m1 is 4.60 m above the floor when it is released from rest. The pulley axis is

    asked by mimi on May 14, 2011
  93. Chemistry

    Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure

    asked by Emma on January 21, 2013
  94. Physics

    Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will

    asked by Tracy on March 6, 2012
  95. ap chemistry

    Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more complicated, but this is a reasonable first approximation.) The combustion of carbon is described by the equation C(s) + O2(g) −! CO2(g) H◦ = −394 kJ What is the value

    asked by gabriella on October 22, 2013
  96. physics

    A man seeking to set a world record wants to tow a 104,000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 93 kg, and the coefficient of static friction between his shoes and the runway is

    asked by Hanna on November 17, 2013
  97. physics

    A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction

    asked by Bob on December 1, 2013
  98. Physics

    A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: v(t) = a − bt + ct2 Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10*10^-3 m/s2 At a time of

    asked by John on January 2, 2014
  99. science

    A man seeking to set a world record wants to tow a 106,000-kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 77 kg, and the coefficient of static friction between his shoes and the runway is

    asked by Donna on October 4, 2013
  100. Phizzics....

    The Canadian microsatellite MOST (Microvariability and Oscillations of Stars) has a mass of just 52 kg. It travels in an almost circular orbit at an average altitude of 820 km above Earth’s surface. a) Calculate the gravitational force between Earth and

    asked by dreamygirl on May 15, 2012

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