1. Physics

    Which of the following involves a non-zero net force? I. A hockey-puck sliding at a constant speed on ice. II. The earth revolving around the sun at a constant speed. III. An object falling near the surface of the earth. A) I only B) III only C) Both I and
  2. science

    Hi...I am having trouble on one last science question. Which statement supports the fact that Earth rotates about its axis from West to East? a. only one face of the moon is visible from earth b. the moon's phases change every day over the course of 29
  3. Physics

    A rabbit runs in a garden such that the x- and y-components of its displacement as function of times are given by x(t) = −0.44t2 − 6.0t + 73 and y(t)= 0.35t2 + 8.3t + 34. (Both x and y are in meters and t is in seconds.) (a) Calculate the
  4. physics

    the gravity that sun has on the moon is about 2 times more than the gravity from earth so why doesn't moon run away from earth to sun?
  5. science

    The mass of the girl in earth is 24kg. What is her mass and weight in moon if the moon's gravity is 1/6 of the earth' gravity?
  6. Physics

    A spy satellite is in circular orbit around Earth. It makes one revolution in 6.00 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] Please provide a step by step
  7. Math

    The scale for an earth model is 1:40000000. The diameter of the earth is 12,756.32km. a)What is the diameter of the model in cm? b) If the model is cut in half, how many jars of paint would be needed to paint each half if 1 jar covered 10cm^2?
  8. PHY101

    A 1200kg travelling east collides with another 1000kg car travelling north. If they are both travelling at 90km/h and the collision is completely inelastic, find the velocity of the systemafter collision.
  9. Advanced Placement World History

    i need to answer these essays any information will be helpful!!! Change Over Time choose TWO areas listed below and analyze how each area's relationship to global trade patterns changed from 1740 to 1914. Be sure to describe each areas involvement in
  10. american history

    Which of the following statements is true of the Gulf of Tonkin affair? A. Congress was divided and only reluctantly passed the Gulf of Tonkin Resolution. B. The destroyer Maddox was sunk by North Vietnamese gunboats. C. Johnson approved covert amphibious
  11. american history

    which of the following statements is true of the Gulf of Tonkin affair? a. Johnson approved covert amphibious raid on the north Vietnam B. congress was divided and only reluctantly passed the gulf of Tonkin resolution c. the destroyer Maddox was sunk by
  12. geography

    if you travel westward along the 80th parallel north of the equator from the international Date line to 150 degrees East longitude, how far have you gone in both degrees of longitude and miles? Enter these coordinates in this web site and you'll get an
  13. Physics

    A police car is traveling at a velocity of 20.0 m/s due north, when a car zooms by at a constant velocity of 44.0 m/s due north. After a reaction time 0.700 s the policeman begins to pursue the speeder with an acceleration of 6.00 m/s^2. Including the
  14. physics

    A small airplane with a wingspan of 13.5 m is flying due north at a speed of 70.8 m/s over a region where the vertical component of the Earth's magnetic field is 1.20 µT downward. (a) What potential difference is developed between the airplane's wingtips?
  15. physics

    can someone take me through this vector combination question please an airplane is observed to be flying at a speed of 600km/h. The planes nose points west. The winds velcoity is 40km/h 45degrees west of south. Find the air planes velocity relative to the
  16. Physics

    If there was a way to accelerate a spaceship close to the speed of light to go visit some neighboring star system, one would still face the problem that every particle the spaceship finds on its way will be a projectile hitting it with almost the speed of
  17. physics

    A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to
  18. 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
  19. science

    the best explanation of why the Moon appears to change shape throughout the month is •from Earth's perspective, we see varying amounts of the illuminated part of the Moon. • the Moon is revolving around the Earth** • from a bird's eye view, the Moon
  20. earth science

    which of the following is NOT a major component of soil a)mineral matter b)air c)humus d)earth worms 2) a soils texture is determined by a) mineral composition B)type of humans c)water content d)particle size 3)the main source of organic matter in soil is
  21. chemistry

    Which of the statements correctly describes the reactivity of noble gases, according to the octet rule? They have eight electrons in their valence shell, so noble gases are very unreactive. They have eight electrons in their valence shell, so noble gases
  22. physics

    vector A = a displacement of 20 m due east vector B = a displacement of 30 m north find the magnitude and direction of the vector sum a+b
  23. physics

    I neeeeeeeeeed helppp pronto, Measurements show that a honeybee in active flight can acquire an electrostatic charge as great as 93.0 pC a. how many electrons must be transferred to produce this charge? b.suppose 2 bees, each with a charge of 93.0pC, are
  24. Physics

    An ice skater skates 13.3 m southwest, then 26.6 m east, and finally 39.9 m in a direction 51.5◦ north of east. Find the magnitude of the displacement required to bring the skater back to her starting point. Answer in units of m
  25. Physics

    Two hockey players strike a puck of mass 0.168 kg with their sticks simultaneously, exerting forces of 1.16 103 N, directed west, and 9.90 102 N, directed 30.0° east of north. Find the instantaneous acceleration of the puck.
  26. AP Physics

    An ice skater skates 28 m southwest, then 56 m east, and finally 84 m in a direction 50.3 ◦ north of east.Find the magnitude of the displacement required to bring the skater back to her starting point. Answer in units of m
  27. Physics

    An ice skater skates 16.9 m southwest, then 33.8 m east, and finally 50.7 m in a direction 50.9◦ north of east. Find the magnitude of the displacement re- quired to bring the skater back to her starting point. Answer in units of m
  28. physics

    Two hockey players strike a puck of mass 0.159 kg with their sticks simultaneously, exerting forces of 1.30 103 N, directed west, and 9.90 102 N, directed 30.0° east of north. Find the instantaneous acceleration of the puck.
  29. Science help

    India : Duck Australia : Duck South Africa : Duck, Goose Africa : Duck Cat Antarctica: Duck Goose cat If scientist wanted to argue that South Africa, Africa, and Antarctica was once connected, which animals would they use to determine that? Would it be
  30. History

    what did reconstruction fail to do in south carolina? A.readmit the state to the union B.establish the belief in white supremecy among some group C.return control of state politicsto local leaders D.free african americans from slavery? I Got C but im not
  31. geology

    1. What fraction of the Earth is made up of each of the major compositional layers: core, mantle, and crust? 2. What cities lie the same distance from our town as the boundaries of the following layers in the Earth lie from the solid surface? a.Base of
  32. eng

    the primary purpose to al gore's an inconvenient truth is a. to inform the readers that there is environmental hazard in burning fossil fuels b. to entertain readers with stories from his college days and his professor's quotations c. to persuade the
  33. Physics

    Suppose that instead of our sun, our star were a giant star such as Betelgeuse. The mass of Betelgeuse is estimated to be about 20 times that of our sun. With earth in the same orbit? With its same mass, how long would our year be in earth days if we
  34. functions

    A person’s weight, w, on a planet of radius r is given by: w= kr^-2 k < 0 where the constant, k, depends on the masses of the person and the planet.What fraction of the Earth’s radius must an equally massive planet have for a person to weigh ten
  35. physics

    the distance from the earth to the sun is 1.5 times 10 to the 11 power m ( 93 million miles) and the time for one complete orbit of the earth about the sun is one year. how long would it take a planet located at twice this distance from the sun to complete
  36. algerbra 1

    Antartica comprises about 10.5% of the total land area on earth. antartica has a surface area of about 5,400,000 square miles. what is the total land area on earth? write an equation and slove.
  37. Science

    One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from Earth. If you are about 11 years old now, how old will you be when light that is leaving Arcturus today reached Earth? How far, in kilometers, will it have
  38. geometry

    the area of the rectangular playground enclosure at South School is 500 square meters. The length of the playground is 5 meters longer than the width. Find the dimensions of the playground, in meters.
  39. chemestry

    Balance th following equation in acid Solutiong and determind if it is spontaneous under standard conditions. NO3^-1 + Sn^+2 ---> NO + Sn^+4 balanced directed to first post. You need to calculate the E value to determine if it is spontaneous or not.
  40. APChem

    "Part A: Most of the transition metals form brightly colored ionic substances. Which elements located in the first row transition metals cannot form ionic compounds? Explain. Part B: Explain why representative metals do not form colored compounds." I am
  41. Math HELP PLEASE

    find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in
  42. science

    Please help me with these questions I have looked all threw my book but i cant find them. 7. Why are we not sure about the interior of the earth? Do we know for sure why? 12. Some volcanoes are more explosive than others? What makes this diffrence in
  43. Math

    find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in
  44. history

    "Upon what principle is it that the slaves shall be computed in the representation? Are they men? Then make them citizens and let them vote. Are they property? Why then is no other property included" - Gouverneur Morris What is the meaning of this quote?
  45. Earth & Space Science

    Could someone please tell me what do you do in this class. I'm going to be a senior next year [High School] , & thinking of taking this class. And also if someone could tell me where to find notes for that class. THANK YOU!
  46. PHYSICS

    Two satellites A and B are in different circular orbits about the earth. The orbit speed of satellite A is three times that of satellite B. Find the ratio (TA/TB) of the periods of the satellite.
  47. Social Studies

    Which of the following was the provision in the Treaty of Paris in 1763? a. All French land in North America was to be given to England b. All French land in North America was to be given to Spain c. All French lands west of the Mississippi and Louisiana
  48. science - physics

    A plane flies with a velocity of 52 m/s east through a12 m/s cross wind blowing the plane south. Find the magnitude and direction (relative to due east) of the resultant velocity at which it travels.
  49. algebra

    1.) The volume of a rectangular box is 64 ft3. If the width is 3 times longer than the height, and the length is 9 times longer than the height, find the dimensions of the box. Define your variables then show all work using the equation editor. Write a
  50. College Algebra

    The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 44 years.
  51. Earth Science

    Unlike most road maps, topographic maps can be used to find 1: the best route to a town 20 km away. 2: the temperature at any place on the map 3:the elevation above sea level. 4:the distance between two locations
  52. Math

    A40m deep wellwith radius 3.5m is dug and the earth taken out is evenly spread to form a plat form ofdimensions 28mby 22m. find the height of the platform.
  53. English

    Thank you very much for your corrections. I still have a few alternatives for you to check. 1) The demand for new clothes created the necessity (better: caused the development of new machinery?) to invent machinery for cloth-making. 2) New factories were
  54. algebra 2

    A commercial freight carrier is flying at a constant speed of 400mi/h and is traveling 4 mi east for every 3 mi north. A private plane is observed to be 210 mi due east to the commercial carrier, traveling 12 mi north for every for 5 mi west. a.If it is
  55. Physics

    The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo
  56. physics

    . The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's
  57. physics

    The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.
  58. physics

    The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.
  59. Science

    If you are one mile off the beach in the Atlantic Ocean, how deep is the ocean? Thanks for your help. Which beach? Is it in Europe, North America, Africa, South America or Antarctica? We'll try to research your question if we know the exact location of
  60. Science

    What are the building blocks of minerals? A. Rocks B. Elements C. Isotopes D. Electrons I believe the answer is A.
  61. Physical Science

    Explain why a neutral atom cannot haveone proton, one neutron and two electrons?
  62. chemistry

    calculate the velocities of electrons with de Broglie wavelengths of 1.0x10^2nm and 1.0nm
  63. chemistry

    State the number of valence electrons for a chloride ion in an ionic bond.
  64. Biology

    What role do high-energy electrons play in the electron transport chain?
  65. Physics

    The discreteness of the energy levels of electrons about the atomic nucleus is best understood by considering the electron to be a .....?
  66. Physics

    Can someone explain why electrons cannot exist in orbitals and why we need to describe their location in terms of probabilities.
  67. chemistry

    State the number of valence electrons for an iron(II) ion in an ionic bond.
  68. physics

    What is the charge of a bare Magnesium nucleus (no electrons, just the protons and neutrons) in Coulombs?
  69. chemistry

    State the number of valence electrons for an iron(II) ion in an ionic bond.
  70. College Chemistry

    Do odd electrons make a weak or strong repulsion axis?
  71. chemistry

    What is composed of atoms in fixed proportions? A. mixtures B. compounds C. electrons D. elements
  72. Physics

    How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.0 ìC?
  73. Chemisty

    Write the symbols of the family of elements that have seven electrons in their outermost energy level.
  74. physics

    How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.1 µC?
  75. Physics

    How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?
  76. Chemistry (electron transfer)

    Li^+(aq) + Zn(s) → Li(s) + Zn^2+(aq) How many electrons are transferred in the balanced equation? I came up with an answer of 2, is this correct?
  77. Physics

    How much work must be done to bring three electrons from a great distance apart to 1.0 * 10^(-10)m from one another (at the corners of an equilateral triangle)?
  78. biology

    an atom that gains for loses electrons has an electrical charge and is called an _____.
  79. Chemistry

    Give the maximum number of electrons in an atom that can have the following set of quantum numbers. (a) n=4 (b) n = 5, ml = 1, (c) n = 5, ms = 1/2
  80. physics

    a small pith ball carries a charge of -1.3 uc. how many excess electrons does this represent?
  81. chemistry

    if 4.4 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?
  82. chemistry

    What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.5*10^{15}Hz?
  83. atoms, eassy peazzy, cant remember!!

    Oxygen has #16 so it has 16 electrons. By subtracting is the same as the atomic number.
  84. physics

    At what distance would the repulsive force between two electrons have a magnitude of 8.50 N? I have no idea how to do this problem... can someone help me please... 3x10^-4/8.50?
  85. science

    Draw and label a diagram of a nitrogen atom. It should have 7 protons,7 neutrons, and 7 electrons
  86. science

    What is all matter made up of? Are you searching for atoms, electrons and/or protons? I hope this helps. Thanks for asking.
  87. Ivy Tech

    The source of magnetism is A)polarization B)magnetic monopoles C)electrons D)protons
  88. Chemistry

    Given the following three electron configurations: 1s2 2s2 2p5 How many core electrons does this element have? A. 4 B. 5 C. 9 D. 2
  89. Chemistry

    Determine the maximum number of electrons that can have each of the following designations. 2f,1Py,2Pz,5dyz,6f
  90. Chemistry

    What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.7×10^{15} Hz?
  91. Science

    state the number of electrons either lost or gained in forming each ion. Br- As3-
  92. chemistry

    how many unpaired electrons are in this configuration 1s2 2s2 2p6 3s2 3p3
  93. chem

    How can the energy levels of electrons be determined by measuring the light emitted from the atom?
  94. chemisrty

    how can you calculate the net charge of an ion if you know the number of protons, neutrons, and electrons it contains?
  95. Chemistry 101

    List 15 sets of quantum numbers (n,L,mL,ms) that could be used to describe all the electrons in phosphorous?
  96. chem

    1. Why can't you have 3 electrons in one orbital? 2. Why does Indium break the left to right trend for ionization energy?
  97. Bio

    why does pH of the matrix increase when electrons flow along the electron transport chains of mitochondria?
  98. Chemistry

    How do valence electrons play a part in the physical or chemical charactersitics of an element?
  99. physics

    how many electrons must be removed from an electrically neutral silver dollar to give a charge of +2.8 uc
  100. Physics

    Two electrons exert a force of repulsion of 0.96 N on each other. How far apart are they? The elemental charge is 1.602 × 10 −19 C .