Questions Asked in September 2009

Most Popular Questions of September 2009

  1. physics

    A wave of amplitude .30 m interferes with a second wave of amplitude .20 m. What are the largest and smallest displeacements that can occur? What type of interference is demonstrated by each displacement?

    asked by Lee on September 8, 2009
  2. Pre-Algebra

    What do they call the International Hula Hoop Championships?

    asked by Mikayla on September 15, 2009
  3. Physics

    A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28degrees above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively.

    asked by Ashley on September 25, 2009
  4. chem

    Does baking soda and vinegar have a complete ionic equation? HC2H3O2 (aq) + NaHCO3 ===> NaC2H3O2(aq) + H2CO3(aq)----->H2O(l)+CO2(g)+2H2O(l)

    asked by Lou on September 30, 2009
  5. Physics

    Christian is making a Tyrolean traverse. That is, he traverses a chasm by stringing a rope between a tree on one side of the chasm and a tree on the opposite side, 25 m away. The rope must sag sufficiently so it won't break. Assume the rope can provide a

    asked by Precilla on September 23, 2009
  6. Physics

    Two point charges are separated by 6 cm. The attractive force between them is 20 N. Find the force between them when they are separated by 12 cm. (Why can you solve this problem without knowing the magnitudes of the charges?)

    asked by Merideth on September 9, 2009
  7. physics

    you are standing on one side of the river. Figure out the width of the river. All calculations have to be made on the side you are standing on. You cant step into the river or cross it. You may use the 2 laws ( sine and cos ). no guessing allowed. has to

    asked by just wondering on September 12, 2009
  8. math

    Accoring to math teachers, what did the acorn say when it grew up? there is ten questions and 15 boxes

    asked by joy on September 8, 2009
  9. Chemistry

    When 20.5g of methane and 45.0g of chlorine gas undergo a reaction that has a 75.0% yeild, what mass of chloromethane forms?

    asked by Sam on September 29, 2009
  10. science

    a ball is thrown straight upward and returns to the thrower's hand after 3.00s in the air. A second ball is thrown at an angle of 30.0 deg with the horizontal. At what speed must the second ball be thrown so that it reached the same height as the one

    asked by tani on September 8, 2009
  11. chemistry

    A saturated solution was formed when 4.48×10−2 L of argon, at a pressure of 1.0 atm and temperature of 25 C, was dissolved in 1.0 L of water. Calculate the Henry's law constant for argon in mol/atm. I got an answer of 1.4*10^-3, maybe my units are

    asked by RE on September 17, 2009
  12. Chemistry

    Many metals react with oxygen gas to form the metal oxide. For example calcium reacts: 2Ca(s) + O2(g)--> 2CaO(s) Calculate the mass of calcium prepared from 4,20g of Ca and 2.80g of O2. (a) How many moles of CaO can form from the given mass of Ca? (b) How

    asked by Courtney on September 28, 2009
  13. AP Chemistry

    C2H2(g) + 2H2(g) --> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following table: C2H2(g) 226.7 kj/mol C2H6(g) -84.7 kj/mol [the values are the change in enthalpy] a. write the equation for the

    asked by Anonymous on September 27, 2009
  14. Math: Calculus

    The max. weight M that can be supported by a beam is jointly proportional to its width w and the square of its height h, and inversely proportional to its length L. a) write an equation that expresses the proportionality. b) determine the constant of

    asked by Anonymous on September 22, 2009
  15. Math

    What do they call the international hula hoop championships?

    asked by Lauren on September 1, 2009
  16. chem.

    A sample of argon at 300. °C and 50.0 atm pressure is cooled in the same container to a temperature of 0. °C. What is the new pressure? 105 atm 45.5 atm 54.9 atm 23.8 atm 42.7 atm

    asked by Anonymous on September 29, 2009

    Rate of Change You are given the dollar value of a product in 2008 and the rate at which the value of the product is expected to change the nest 5 years. write a linear equation that gives the dollar value V of the product in terms of the yeart.(let t= 0

    asked by kim on September 26, 2009
  18. physics

    The question is a child slides down a slide with a 28 degree incline and at the bottom her speed is precisely half what it would have been if the slide had been frictionless. Calculate the coefficient of the kinetic friction between the slide and the

    asked by perry on September 18, 2009
  19. Chemistry

    At 900 K the following reaction has Kp=0.345; 2 SO2(g) + O2 (g) -> 2 SO3 (g) In an equilibrium mixture the partial pressures of SO2 and O2 are 0.145 atm and 0.455 atm, respectively. What is the equilibrium partial pressure of SO3 in the mixture?

    asked by Anonymous on September 7, 2009
  20. geometry

    In triangle LM equals 5 and m angle K equals 45. find KL. leave your answer in simplest radical form.?

    asked by joana on September 2, 2009
  21. chemistry.

    What amount (in moles) of FeS2(s) are required to produced 64g of SO2(g) according to the following equation? 4FeS2(s) + 110(g)_________2FeO3(s)__8SO2(g)...remember the first long bar is an arrow.

    asked by mary. on September 28, 2009
  22. chemistry.

    Methane, CH4 burns in oxygen gas to form carbon dioxide and water. How many moles of carbon dioxide will be formed from 8.0g of methane?

    asked by Denmark on September 28, 2009
  23. Physics

    From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.00 m/s and angle of 20.0 degrees below the horizontal. It strikes the ground 3.00 s later. (a) If the base of the building is taken to be the

    asked by Vico on September 21, 2009
  24. MATHS

    The recipe for mint chocolate ice cream requires 2 1/4 cups of creams for 5 people. You need ice cream for 8 people. How much cream will you need? Please explain,thanks.

    asked by BRENDON on September 13, 2009
  25. MATH

    1. Find the area of the figure.(The figure is a trinagle with a dotted line directly down the middle with the measurements of 4 by 9 ft) A~18 FT2? 2. Find the area of the figure. Use 3.14 for and round your answer to one decimal place(The figure is a

    asked by A~ on September 20, 2009
  26. AP Physics

    A girl is whirling a ball on a string around her head in a horizontal plane. She wants to let go at precisely the right time so that the ball will hit the target on the other side of the yard. When should she let go of the string?

    asked by Henry on September 24, 2009
  27. math

    an open box contains 80cm^3 and is made from a square piece of tinplate with 3cm squares cut from each of its 4 corners. Find the dimensions of the original piece of tinplate.

    asked by Cynthia on September 20, 2009
  28. Literature- Antigone dialogue

    This is my alternate ending to Antigone please feel free to comment on it, and give me a letter grade. I'm in 10th grade. Does it sound good so far I'll post the other half as soon as you comment Antigone: I deserve to die Polynecies meant everything to me

    asked by Theresa on September 6, 2009
  29. algebra

    why do girls like guys who wear shirts with eight buttons

    asked by hailey on September 17, 2009
  30. physics

    If Vx= 8.00 units and Vy= -6.40 unis, determine (a)the magnitude and (b)direction of ->V(vector) b) theta= ______ degrees below the positive x-axis.

    asked by Physics on September 14, 2009
  31. Physics

    A vector has an x component of -30.0 units and a y component of 49.5 units. Find the magnitude and direction of the vector.

    asked by Anonymous on September 21, 2009
  32. Physics - ice to liquid

    Fifty grams of hot water at 80oC is poured into a cavity in a very large block of ice at 0oC. The final temperature of the water in the cavity is then 0oC. Show that the mass of ice that melts is 50 g. To melt ice to 50g of water, I think that it will

    asked by Ceres on September 24, 2009
  33. Chem

    1) Draw the Lewis structure for CH3NCO, a neutral molecule. 2) Draw the best Lewis structure for NCCH2COCH2CHO, a neutral molecule.

    asked by Glow on September 7, 2009
  34. Elasticity (Physics)

    A tunnel of length L=150m, height H=7.2m, and width w=5.8m (with a flat roof) is to be constructed at a distance d=60m beneath the ground. The tunnel roof is be entirely supported by square steel columns, each with a cross sectional area of 960 cm^2. The

    asked by David on September 9, 2009
  35. Chemistry II

    Is iodine (I2) more soluble in water or carbon disulfide (CS2)? Why?

    asked by pasely on September 9, 2009
  36. Chemistry

    When 0.100 mol of carbon is burned in a close vessel with 8.00g of oxygen, how many grams of carbon dioxide can form? Which reactant is in excess, and how many grams of it remain after the reaction?

    asked by Jasmine on September 27, 2009
  37. Physics

    The question is: A small block of ice at 0oC is subjected to 10 g of 100oC steam and melts completely. Show that the mass of the block of ice can be no more than 80 g. There were no equations in my chapter to use for this question except Q ~ change in T. I

    asked by Mary on September 23, 2009
  38. college--physics

    On vacation, your 1400 kg car pulls a 560 kg trailer away from a stoplight with an acceleration of 2.20. What is the net force exerted by the car on the trailer?What force does the trailer exert on the car? What is the net force acting on the car?

    asked by Mary on September 23, 2009
  39. Physics

    A shot-putter throws the shot (mass = 7.3kg) with an initial speed of 15.0 m/s at a 33.0 degree angle to the horizontal. Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.00m above the ground.

    asked by Jordan on September 12, 2009
  40. Chemistry - pH

    Calculate the pH of each of the following solutions: a) .35 M hydrochloric acid, HCl b) .35 M acetic acid, HC2H3O2 c) .35 M sodium hydroxide, NaOH Can someone please explain to me how to calculate the pH in a way that is easy to understand? I am confused.

    asked by Mandy on September 14, 2009
  41. Calculus

    Hi! My question is: Given that f is a function defined by f(x) = (2x - 2) / (x^2 +x - 2) a) For what values of x is f(x) discontinuous? b) At each point of discontinuity found in part a, determine whether f(x) has a limit and, if so give the value of the

    asked by Hillary on September 24, 2009
  42. Chemistry

    Calculate the mass of each product formed when 43.82g of diborane (B2H6) reacts with excess water: B2H6(g) + H2O(l)--> H3BO3(s) + H2(g)

    asked by TeeJay on September 27, 2009
  43. Goegraphy & Culture

    How do the effects of zero population growth and negative population growth differ? How are they similar?

    asked by Shavaleir on September 30, 2009
  44. High School Physics

    The men's world record for the shot put, 23.12m , was set by Randy Barnes of the United States on May 20, 1990. If the shot was launched from 6.00 f above the ground at an initial angle of 42.0 degrees , what was its initial speed? Someone plz help =-(

    asked by Crying Girl on September 15, 2009
  45. phys

    An airplane is heading due south at a speed of 590 km/h. If a wind begins blowing from the southwest at a speed of 65.0 km/h (average). Calculate magnitude of the plane's velocity, relative to the ground. Calculate direction of the plane's velocity,

    asked by physics on September 15, 2009
  46. Chemistry

    Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?

    asked by Telicia on September 27, 2009
  47. Math

    A farmer with 8000 meters of fencing wants to enclose a rectangular plot that borders on a river. If the farmer does not fence the side along the river, what is the largest area that can be enclosed? Does that mean I have to consider it a triangle?

    asked by muffy on September 12, 2009
  48. stoichiometry

    if 5.00g magnesium is combined with 10.0 g of chlorine, show by calculation which substance is the limiting reactant and calculate the theoretical yield of magnesium chloride for the reaction. Someone PLEASE HELP ME!!!!

    asked by Laura on September 11, 2009

    Hydrogen cyanide, HCN, can be made by a two-step process. First, ammonia is reacted with O2 to give nitric oxide, NO. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) Then nitric oxide is reacted with methane, CH4. 2 NO(g) + 2 CH4(g) → 2 HCN(g) + 2 H2O(g) +

    asked by DAWN on September 27, 2009
  50. physics

    Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at starting line but has

    asked by help on September 27, 2009
  51. Org. Chem.

    what is the precipitate formed when HCl is added? I believe the answer is NaCl, but I am not sure and this precipitate only formed in the first NaOH extract, as precipitate was essentially nonexistent in the 2nd extract? Below is what was done in the

    asked by CM on September 21, 2009
  52. Chemistry

    Methanol (CH3OH) is produced commercially by the catalyzed reaction of carbon monoxide and hydrogen: CO (g) + 2H2 (g) -> CH3OH (g) An equilibrium mixture in a 2.50 L vessel is found to contain 2.62e-2 mol CH3OH, 0.170 mol CO, and 0.303 mol H2 at 500 K.

    asked by Anonymous on September 8, 2009
  53. 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

    asked by CM on September 22, 2009
  54. Org. Chem.

    Is malonic acid polar or nonpolar? and does it hydrogen bond with water? with methyl alcohol? with hexane? I keep getting different results and would like some help please with explanation.

    asked by Chelsea on September 14, 2009
  55. Calculus

    I'm having trouble with the following problem: Find the volume of the solid generated by revolving the region about the given line. The region is in the first quadrant bounded above by the line y= sqrt 2, below by the curve y=secxtanx, and on the left by

    asked by Jenna on September 22, 2009
  56. English - Oedipus Rex

    I have to find evidence to support which character I think it the most guilty for what happens to Oedipus. I was just wondering if anyone knows whether or not Sophocles is trying to point the finger at someone other than Oedipus, who I think is the most

    asked by Karen on September 23, 2009
  57. Spanish #1 (URGENT)

    Can someone please check my work? Look at the words in the vocabulary list and write them in the appropriate column. Items in word bank may be used more than once. las cortinas el armario el espejo el televisor el comedor la cómoda la cama el sofá la

    asked by Larry on September 17, 2009
  58. biology

    create a mnemonic for the 6 kingdoms they maybe in any order but you must have all 6

    asked by amanda on September 24, 2009

    Heat exhaustion caused by a person's exposure to heat can result in weakness or collapse. It usually involves a decrease in blood pressure. Explain why the homeostasis adjustment to heat can cause a drop in blood pressure. ---------- I'm not sure if I'm

    asked by Patrick on September 30, 2009
  60. Physical Science

    Two balloons are filled with an equal volume of air. One is put in the refrigerator for one hour, while the other is heated in a slightly warm oven. Identify which balloon is which, and explain why.

    asked by Nathan on September 27, 2009
  61. Physics

    The speed limit in a school zone is 40 km/h. A driver traveling at this speed sees a child run into the road 23 m ahead of hs car. He applies the brakes, and the car decelerates at a uniform rate of 8.0m/s^2. if the driver's reaction time is .25s, will the

    asked by Anonymous on September 3, 2009
  62. phys

    At t= 0, a particle starts from rest at x= 0, y= 0, and moves in the xy plane with an acceleration ->a = (4.0ihat+ 3.0jhat)m/s^2. Assume t is in seconds. Determine the position of the particle as a function of time t. Express your answer in terms of the

    asked by physics on September 15, 2009
  63. Chemistry

    A sample of sandstone consists of silica, SiO2, and calcite, CaCO3. When the sandstone is heated, calcium carbonate, CaCO3, decomposes into calcium oxide, CaO, and carbon dioxide. CaCO3(s) → CaO(s) + CO2(g) What is the percentage of silica in the

    asked by Amanda on September 29, 2009
  64. Chemistry

    Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.6 L of water upon warming from 25 C to 50 C. Assume that the water is initially saturated with nitrogen and oxygen gas at

    asked by RE on September 17, 2009
  65. physics

    The height of a helicopter above the ground is given by h = 3.40t^3 , where h is in meters and t is in seconds. After 2.05 s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground?

    asked by Anonymous on September 19, 2009
  66. Physics

    Two bicyclists, starting at the same place, are riding toward the same campground by two different routes. One cyclist rides 1490 m due east and then turns due north and travels another 1430 m before reaching the campground. The second cyclist starts out

    asked by RE on September 10, 2009
  67. Physics

    A ball is tied to an elastic string of length 8.0 m and swung in a horizontal circle with a velocity of 0.8 m/s. When a metallic object is tied to a rope of length 2.75 m and swung in a horizontal circle, it makes one revolution in 2.9 s. The ratio of the

    asked by Willie on September 21, 2009
  68. math (challenging)

    If R is the remainder when each of the numbers 1059, 1417, and 2312 is divided by D, where D is an integer greater than 1, compute the value of D-R

    asked by seth on September 30, 2009
  69. algebra

    A square plot of land has a building 60ft long and 40ft wide at one corner. The rest of the land outside the building forms a parking lot. If the parking lot has area 12,000ft^2, what are the dimensions of the entire plot of land? The answer is 120ft by

    asked by Sean on September 2, 2009
  70. Physics

    A sprinter runs at a speed of 3.00 m/s on a circular track that has a radius of 40.00 m. Find the centripetal acceleration of the sprinter.

    asked by Willie on September 21, 2009
  71. chemistry

    Potassium perchlorate has a lattice energy of -599 kj/mol and a heat of hydration of -548 kj/mol. Find the heat of solution for potassium perchlorate when 10.6 g of potassium perchlorate is dissolved with enough water to make 102.7 ml of solution.

    asked by ella on September 18, 2009
  72. Physics

    A small 7.10kg rocket burns fuel that exerts a time-varying upward force on the rocket. This force obeys the equation F = A + Bt^2. Measurements show that at t = 0, the force is 121.0N, and at the end of the first 2.10s , it is 176.0N. Part A Find the net

    asked by Dreskillz89 on September 20, 2009
  73. chemistry

    What atomic or hybrid orbitals make up the sigma bond between As and F in hexafluoroarsenate ion, AsF6- ? orbital on AS:? orbital on F:?

    asked by Jen on September 30, 2009
  74. Math

    A boat, whose speed in still water is 2.80m/s , must cross a 280m wide river and arrive at a point 120m upstream from where it starts. To do so, the pilot must head the boat at a 45.0 degrees upstream angle. What is the speed of the river's current?

    asked by Anne on September 12, 2009
  75. Physics

    A box rests on the back of a truck. The coefficient of static friction between the box and the bed of the truck is 0.300. (a) When the truck accelerates forward, what force accelerates the box? (b) Find the maximum acceleration the truck can have before

    asked by Ingo on September 23, 2009
  76. Physics warming a nail

    2.) Pounding a nail into wood makes the nail warmer. Consider a 5-g steel nail 6 cm long and a hammer that exerts an average force of 500 N on the nail when it is being driven into a piece of wood. The nail becomes hotter. Show that the increase in the

    asked by Mary on September 20, 2009
  77. Chemistry

    At a pressure of 103 kPa and a temperature of 22oC, 52.9 g of a certain gas has a volume of 31.5 L. What is the identity of this gas?

    asked by Brandi on September 14, 2009
  78. art

    Match the artwork with the correct description Woman with Packages Housepainter III First Communion Composition IX Hathor and Sety with Non-Representational B. Representational C. Stylized D. Tromp l'oeil E. Abstract

    asked by mareen on September 13, 2009
  79. Chemistry

    A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 375 mL of a solution that has a concentration of Na^+ ions of 1.10M? I tried multiplying .375 L

    asked by Cory on September 28, 2009
  80. physics

    An ostrich can run at speeds of up to 72 km/h. How long will it take an ostrich to run 1.5 km at this top speed?

    asked by aaron on September 7, 2009
  81. math

    a container is filled with 56 litres of pineapple juice. 8 litres of pineapple juice are extracted and the container is refilled with mango juice. the content of the container is thoroughly mixed and 8 litres of the mixture are extracted and the container

    asked by shahroze on September 27, 2009
  82. physics

    A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

    asked by Mary on September 23, 2009
  83. Chemistry II

    17.5 mL of oxygen gas were collected at room temperature 22C and 100.2 kPa of atmospheric pressure. a. How many moles of oxygen gas were produced? b.What is the molar volume of the oxygen gas at the conditions in the laboratory? note, how do you change kpa

    asked by pasely on September 14, 2009
  84. algebra 1

    Charles wants to build a vegetable garden such that three sides of the garden are fenced and the fourth side of the garden will be the existing back fence. He has 30 feet of fencing available. Find the dimensions of the garden that will produce the maximum

    asked by sridhar on September 13, 2009
  85. algebra

    List all the numbers from the given set that are, a.natural numbers b.whole numbers c.integers d.rational numbers, e.irrational numbers {-9,-4/5,0,0.25,ã3,9.2,ã100}

    asked by Liza on September 1, 2009
  86. Physics

    A 20.0 kg box rests on a table. what is the weight of the box and the normal force acting on it? A 10.0 kg box is set on top of the 20.0kg box. Determine the normal force that the table exerts on the 20.0kg box and the normal force that the 20.0kg box

    asked by claire on September 3, 2009
  87. Chemistry

    Two successive reactions, D-->E and E-->F, have yields of 48% and 73%, respectively, What is the overall percent yield for conversation of D to F?

    asked by Jamie on September 27, 2009
  88. math

    daffynition decoder

    asked by selena on September 17, 2009
  89. physics

    A lead ball is dropped into a lake from a diving board 5.24 m above the water. It hits the water with a certain velocity and then sinks to the bottom with this same constant velocity. It reaches the bottom 4.86 s after it is dropped. (Assume the positive

    asked by Nick on September 7, 2009
  90. literature

    hey, do any of you know.. is the story called "the cask of amontillado" or "the cask of the amontillado"? so is there a 'the' or not.. thanks for ur help!

    asked by naz on September 16, 2009
  91. Chemistry

    A solution is prepared by placing 72.8 g of calcium chloride in 120 g of water at 22C. The vapor pressure of water at 22C is 2.6 kPa. a)What is the boiling point of the solution? b)What is the freezing point of the solution?

    asked by haley on September 16, 2009
  92. math

    Chris wants to make an enclosed rectangular area for a mulch pile. She wants to make the enclosure in such a way as to use a corner of her back yard. She also wants it to be twice as long as it is wide. Since the yard is already fenced, she simply needs to

    asked by sridhar on September 16, 2009
  93. chemistry

    how many protons and nuetrons are contained in the nucleus of each of the following atoms? assuming each atom is uncharged, how many electrons are present? a. 235/92U b. 13/6C c. 57/26Fe d. 208/82Pb e. 86/37Rb f. 41/20Ca

    asked by Corey on September 20, 2009
  94. chemistry

    A 150.0-g sample of metal at 80.0∘C is added to 150.0 g of H2O at 20.0∘C. The temperature raises to 23.3∘C. Assuming that the calorimeter is a perfect insulator, what is the specific heat of the metal? [Special heat of H2O is 4.128 J/(g·∘C).] some

    asked by sara on September 22, 2009
  95. 9th grade

    Wat is square root spiral

    asked by Anonymous on September 12, 2009
  96. Socials

    factors which were responsible for the growing wealth and prosperity of England in the 17th century were: -defeat of Spanish Armada -building of colonies -trade with the colonies -agricultural revolution -technology -government please tell me if this is

    asked by Sara on September 14, 2009
  97. Physics

    The archerfish hunts by dislodging an unsuspecting insect from its resting place with a stream of water expelled from the fish's mouth. Suppose the archerfish squirts water with a speed of 2.45 m/s at an angle of 53.0 degrees above the horizontal, and aims

    asked by Leah on September 15, 2009
  98. physics

    An airplane pilot wishes to fly due west. A wind of 82.0 km/h is blowing toward the south. If the airspeed of the plane (its speed in still air) is 380.0 km/h, in which direction should the pilot head? This is what I did. I let theta = arcsin(82.0/380.0)

    asked by Andre on September 20, 2009
  99. AP Physics (circular motion)

    The moon revolves about the Earth in a trajectory that is very nearly a circle of radius r = 384,401 km, and requires 27.3 days (23.4 x 10^5 seconds) to make a complete revolution. What is the acceleration of the moon toward the Earth?

    asked by perry on September 24, 2009
  100. Physics

    An object is allowed to fall freely near the surface of an unknown planet. The object falls 80 meters from rest in 5.0 seconds. The acceleration due to gravity on that planet is? Would the answer be 16?

    asked by Hannah on September 27, 2009