1. Physics

    What is the reaction of the earth pulling down on a pen that is lying on a table
  2. science

    What moves and picks up rocks and is one slow change to the earth?
  3. Science- Astronomy

    How are Earth and Venus different? I already wrote that they have different atmospheres but I need another reason why are different so can someone help me please?
  4. Physics

    What is the magnitude of the earth's gravitational field at sea level?
  5. earth

    which two rocks are primarily composed of a mineral that bubbles with acid?
  6. Physics

    What is the weight (in Newtons) of an object with a mass of 25 kg on the surface of the Earth?
  7. english

    how would you describe some who is crazy to jump from outer space to earth
  8. social studies

    how many temperature or heat zones the earth has been divided?
  9. science

    what is the main source of energy for all living things on earth
  10. science

    what two factors combine to give a person weight on Earth?
  11. astronomy

    the radius of earth is 4000 miles, how far would you travel in going around the equator?
  12. EARTH SCIENCE

    Identify key characteristics of our star,the Sun.
  13. science

    calculate the mass in kg of an object that weighs 1225 n on earth
  14. Earth Science

    A region of ocean water having the same temperature and salinity throughout is what??
  15. Astronomy

    What are two pieces of evidence that the earth is a highly differentiated body
  16. science

    which hemisphere of the earth contains the greater proportion of ocean surface?
  17. Advance Biology

    What is the relationship between CFCs and the Earth's protective layer?
  18. earth science

    The process to convert seawater into fresh water is known as
  19. science

    how is the earth's magnetism useful It provides a navigation mark for hikers and sailors.
  20. geography

    Approximately what percent of Earth’s species live in rainforests? A. 75% B. 25% C. 50% D. 90% i think its B
  21. eave Earth

    any one object which you would like to sell in market and prepare 5 lines on it
  22. science

    Explain the main factors that affect the Earth’s temperature.
  23. Chemistry

    What does the reaction of alkaline earth metals with water tell you? Thanks in advance.
  24. Earth Science

    How tall in miles would a stack of 4.5 billion pennies be?
  25. 8th grade earth science

    how to find the longitude of meridians
  26. science

    The moon revolves around the____. Just need to know if my answer or right or wrong. Thanks! :) Earth
  27. science

    what would happen to day and night if the Earth rotated faster?
  28. Science

    What parts of the earth did glaciers cover during the ice age.
  29. Science

    How does the sun's gravitational attraction to the earth compare to that of the moon?
  30. Biology

    How does the structure of Earth’s interior affect seismic waves?
  31. physics

    for a sateliite to have a speed of 7400 m/s how far must it be in metres above the earth's surface
  32. physics

    if an object weighs 6 kgs on earth, what will it's weight be on mars
  33. science

    What is the acceleration of a 7kg rocjet if a force of 68.6 kg m/s/s (N) is used to move it away from the earth
  34. 4th grade

    how does the cycle of day and night of our earth work?
  35. science

    The moon revolves around the____. Just need to know if my answer or right or wrong. Thanks! :) earth
  36. physics

    An 80kg astronaut has a weight of 120N. How many radii above the earth is he?
  37. Physics

    At what distance from the earth's surface will a mass of 40.0 kg be just 385.0 in weight?
  38. geography

    What is the Earth System that includes the Continental and Oceanic crust?
  39. physics

    What is the period (in seconds) of a simple pendulum 62.0 cm. long, on the earth?
  40. science

    if something big from outerspace hit earth, then where would it have least human impact?
  41. Physics

    At what distance from the earth's surface with a mass of 5.0kg be just 45.0N in weight. HELP
  42. Ap physics

    Determine the mass of the earth from the known period and the distance of the moon
  43. physics

    What is the weight of a 0.2kg toy on or near the surface of the Earth? (g = 9.8m/s2? in newton
  44. 7th grade

    Why cant petrol driven cars we use on earth be used on moon?
  45. science

    how does the natural greenhouse effect supports life on Earth.
  46. physics

    What is the weight of a 0.2kg toy on or near the surface of the Earth? (g = 9.8m/s2? in newton
  47. earth science

    The area where precipitation and storms occur is a ? syestem.
  48. Science

    Why is water only compound occuring naturally on earth in three states?
  49. Science

    If you weigh 300 N on earth, then what is your mass and weight in mars?
  50. phisecs

    `filling the blanks: sun_________________ than moon. earth is__________________mercury.''.
  51. EARTH SCIENCE

    What would a calendar be like on Venus (for a hypothetical Venusian resident)?
  52. science

    Can you please give examples of the interaction of 4 spheres/subsystems of the earth.
  53. science .. urgent

    what are some conditions on Earth that make it possible to live and survive?
  54. Science

    What role does induction play when lightning strikes Earth?
  55. 9th grade

    what divides the earth into the northern and southren hemispheres
  56. Science

    How does the Sun's rays hitting the Earth affect the seasons?
  57. Physics/Science

    Why would someone using a Foucault Pendulum at the equator say that Earth does not rotate?
  58. Physics

    At what DISTANCE from the earth's surface will a mass of 5.0kg be just 45.0N in weight
  59. Physics

    Could someone explain to me about how live, earth and neutral wires work?
  60. social studies

    what is one of the earth's seven large bodies of land is called what?
  61. Science

    Why does Earth exert a stronger gravitational force than the Moon?
  62. CHEMiSTRY PLEASE HELP

    What is the mass of 4.2 kg of gold when it is transferred to a planet having twice the gravity of earth?
  63. natural science

    What are the structural zones within the Earth? How are they detected scientifically?
  64. Earth science

    how does the temperature of ocean currents affect climate?
  65. science

    if a person weighs 120kg on earth, how much would they weigh in space
  66. earth science

    what are the landscape regions that the hudson river flows through
  67. Orbital Mechanics

    Some help with this exercise please. If you could give an explanation and not only the answers it would be great!!! Besides the 3-2-1 rotation sequence, another very common sequence in spacecraft applications is the 3-1-3 rotation sequence in which the z
  68. french

    Here is my last post for a little bit I have two questions one Mme when ever you reply all the accents on my screen turn weird is there a problem with that? and here are 3 more with english and french Saint-Louis-Du-Ha!-Ha! English If you are going to book
  69. English

    I have to identify the verbs in the sentence and decide if they are linking,transitive, or intransitive. Please check these and let me know if they are correct. 2. She turned her face to the sun. (transitive) 4. The leaves on the tree turn bright red in
  70. physics

    One of the tenets of the pseudoscience (i.e., "false science") of astrology is that, in some mysterious way, the positions of the planets at the time of a person's birth somehow influence the characteristics of that person. To see if this proposition seems
  71. Science

    1. How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together.<<(I think it's this answer) C. They cooled and pulled ice together. D. They began to rotate. 2. What distance was used to define the
  72. physic

    Between the orbits of Mars and Jupiter, several thousand small objects called asteroids move in nearly circular orbits around the Sun. Consider an asteroid that is spherically shaped with radius r and density 3000 kg/m3 . You find yourself on the surface
  73. physics

    Spending a long time in weightlessness is unhealthy. One of the most important negative effects experienced by astronauts is a loss of muscle and bone mass. Since an ordinary scale won’t work for an astronaut in orbit, what is a possible way of
  74. Social Studies

    My most exalted Monarch - Your Majesty Queen Isabella, I am writing this letter most humbly for you to consider my request for three small ships and a crew so that I may sail west and find the shortest route to the East. I promised to chaim land for Spain
  75. science

    the acceleration of gravity on the surface of Mars is m/s squared. if an astronaut in a space suit can jump upward 20cm on the earth's surface, how high could he jump on the surface of Mars? You need to provide a number for the acceleration of gravity on
  76. physics (please help elena)

    Three planets interact with one another through their mutual gravitational forces only; they are isolated in free space and do not interact with any other bodies. They orbit around an axis going through the center-of-mass of the system and perpendicular to
  77. 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
  78. physics

    In one type of mass spectrometer, ions having the same velocity move through a uniform magnetic field. The spectrometer is being used to distinguish 12C+ and 14C+ ions that have the same charge. The 12C+ ions move in a circle of diameter 25 cm. (a) What is
  79. Physics

    The atmosphere of Mars exerts a pressure of only 600 Pa on the surface and has a density of only 0.02 kg/m3. (a) What is the thickness of the Martian atmosphere, assuming the boundary between atmosphere and outer space to be the point where atmospheric
  80. English

    1. I feel painful in the stomach. 1-1. I feel painful on the stomach. (Which one is correct?) 2. The first seed was bigger than the second seed at first. However it was afraid of the cold. So it didn't try to go out. It waited for warm weather. However,
  81. how the earth was made

    Video Guide: How the Earth was Made Section 1: 1. What did James Hutton discover as proof that the Earth was an old Earth? 2. What is the scientific explanation for how the Earth was formed? 3. What did Kelvin not take into account as far as the Earth
  82. English

    I have to identify the verbs in the sentence and decide if they are linking,transitive, or intransitive. Please check these and let me know if they are correct. 2. She turned her face to the sun. (transitive) 4. The leaves on the tree turn bright red in
  83. Physics

    A 0.28-kg stone is held 1.5 m above the top edge of a water well and then dropped into it. The well has a depth of 4.8 m. (a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system before the stone
  84. Physics

    A 0.31-kg stone is held 1.2 m above the top edge of a water well and then dropped into it. The well has a depth of 5.6 m. (a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system before the stone
  85. Physics

    A river flows due south with a speed of 2.00 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.20 m/s due east. The river is 800 m wide. What is the magnitude of his velocity relative to the earth? got it....4.65 m/s
  86. science

    how does running water contributes most to the general wearing of earth's surface?
  87. science

    what is needed need to test the albedo of ice affect Earth’s climate
  88. earth science

    state how the sun generates the energy that it radiates away as its luminosity.
  89. earth science

    why do they call oil and natural gas "fossil" fuels?
  90. Earth Science

    Tomorrow will be sunny with high clouds. What does this statement describe?
  91. sci

    why does the earth cool off at night much more quickly when the sky is clear than cloudy
  92. Language arts

    What are the verbs in this phrase: Hawaii is one of the most beautiful places on earth
  93. SCIENCE

    1. which of earth’s spheres contain most of its mass? A. atmosphere b. hydrosphere c. geosphere d. biosphere
  94. Earth Science

    the magnification of a telescope is changed by changing what? my answer is the eyepiece
  95. science

    Are there any questions on earth that haven't been answered or are to compicated for scientists to get to or understand?
  96. Science

    where can i find a good site that will show me the change's of the earth's atmosphere?
  97. physics

    A man weighs 750.0 N on Earth at what altitude will he weigh 187.5 N?
  98. Physics

    two satellites are launched from earth to the same altitude. One is twice the mass of the other. How will their periods compare?
  99. Science

    If a rock weighs 100 pounds on Jupiter, what will it weigh on earth?
  100. physics

    How many minutes would it take a radio wave to travel from the planet Venus to earth?