1. math

    A pole 12 feet tall casts a shadow 9 feet long. How tall is a tree that casts a shadow 54 feet long?
  2. Physics

    A 19000 kg sailboat experiences an eastward force 16400 N due to the tide pushing its hull while the wind pushes the sails with a force of 55200 N directed toward the northwest (45 ◦ westward of North or 45 ◦ northward of West). What is the
  3. english

    what should be capitalized? The ceiling of the sistine chapel in rome contains a painting 133 foot long and 45 feet wide. The names of specific buildings and cities are some of the items that are considered proper nouns and whose first letters need
  4. physics

    An evacuated spherical diving bell containing a camera is in the ocean at a depth of 107 m. It has a flat, transparent, circular port with a diameter of 10.5 cm. Find the magnitude of the total force on the port. For the density of seawater use 1025 kg/m3.
  5. Chemistry (Electrons in Atoms)

    True or False. 1)Electrons give off light as they drop to lower energy levels. 2)Electrons travel around the nucleus as waves. 3)A photon of low frequency light has more energy than a photon of high frequency light. 4)Orbitals with equal energy levels each
  6. physics

    A delivery truck travels 19 blocks north, 14 blocks west and 15 blocks south. What is its final displacement from the origin?
  7. Physics

    A car travels 20km due north and then 35km in a direction 60 degree west of north. Find the magnitude and direction of the resultant.
  8. Social Studies

    I have this assignment for ss that is due on monday. Here it is (the assignment paper) LETTER TO QUEEN ISABELLA In 1492, Queen Isabella of Spain provided an Italian explorer and navigator, Christopher Columbus with 3 small ships the Nine, The Pinta, and
  9. Geography

    Where on Earth? You work for a company that specializes in environmental cleanup. Your company has been approached by representatives of several Eastern European governments. They want to clean up the Danube River and are asking companies in the United
  10. physics

    a plane flys 350 km south along a straight path with an average velocity of 125 km/h to the south. the plane has a 30 minute layover and then travels 220 km south with an average velocity of 115 km/h to the south. what is the average velocity of the trip
  11. Math - Please check!

    1. Find the circumference of a circle with a diameter of 11 cm to the nearest hundredth. Measurement formula C = pi x diameter a. 34.54 cm *** b. 17.27 cm c. 5.5 cm d. 33 cm 2. Which of the following is an irrational number? a. square root 144 b. 0.25 c.
  12. physics

    A tennis ball has a mass of 58 g and a diameter of 8 cm. Find the moment of inertia about its diameter. Assume that the ball is a thin spherical shell.
  13. history

    Which of the following caused a rapid increase in the demand for coal and other fossil fuels in the late 1800s? HOME HEATING IN THE NORTH NEW SHIPS USING STEAM POWER COTTON PRODUCTION IN THE SOUTH MANUFACTURING IN THE NORTHEAST
  14. Geography

    4. All of the following are examples of historical forced migration, except....... A. The Atlantic Slave Trade B. Stalin's displacement of people of the former USSR C. The Trail of Tears D. British convicts sent to Australia E. Minority Migrations from the
  15. social studies

    i dun get this. ulysses s grant lost his popularity with voters as a result of a. desire for reconciliation between north and south b.lack of work to the reconstruction c.presidency scandals d. dissatisfaction with the republican party.
  16. social studies 9

    Charles's support came from the north and west of england, while par;iament's came form the south and east. what influence did economic conditions have on the outcome of the civil war PLEZZZ HELP I REALLY NEED TO ANSWER THIS BUT I DON'T NO HOW TO
  17. History

    What was the primary purpose of the Constitutional convention of 1787? A. Outlaw slavery In both the north and south B. Place taxes on the imports and exports C. Revise the articles of confederation D. Reduce the power of the federal government
  18. Physics

    An automobile leaves the store, first going south at 88 km/h for 2 hours, and then turns on a road heading 20 degrees east of north at 55 km/h for 1.5 hours. Calculate the (x,y) components of the net displacement of the automobile from the starting
  19. Science

    1. Where is the Earth's equator located today? Describe the climatic conditions. 2. Compare and contrast the climatic conditions existed during this time today. 3. Answer: What types of fossils would you expect to find here? Explain why based on the
  20. physics

    A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the
  21. Physics

    A satellite moves on a circular earth orbit that has a radius of 6.4 106 m. A model airplane is flying on a 23-m guideline in a horizontal circle. The guideline is parallel to the ground. Find the speed of the plane such that the plane and the satellite
  22. physics

    A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the
  23. physics

    A satellite moves on a circular earth orbit that has a radius of 6.68E+6 m. A model airplane is flying on a 16.3 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the
  24. Math

    A person travels 8 mi, due north, 3 mi, due west and 7 mi due south how far are they from were they started?
  25. Physics Homework

    1. You push a heavy car by hand. The car, in turn, pushes back with an opposite but equal force on you. Doesn’t this mean the forces cancel one another, making acceleration impossible? Why or why not? -No, because of the system that is involved. The
  26. Science

    How do I determine the amount of electrons in highest occupied energy level? Thanks The elements in Carbon-12, Atomic Number =6, Neutron 6, Electron=6, and Proton= 6. How would I find the electrons in highest occupied energy level?
  27. Physics

    A delivery truck travels 21 blocks north, 17 blocks east, and 27 blocks south. What is its final displacement from the origin (direction)?
  28. US History

    Why were yeoman farmers often called "the backbone of the South" in the period from 1820 to 1850? A) When government officials wanted to oversee how Southern land was cultivated, yeoman farmers challenged the idea. B)Yeoman farmers grew vegetables, raised
  29. Science

    What is the main method of heat transfer from the core to the crust of earth? A. Conduction B. Convection C. Radiation
  30. Science-Chemistry

    How would I figure out how far the distance in kilometers between the sun and earth be if it takes 8.3 minutes for light to travel?
  31. physics

    If there were no air drag, how fast would drops fall from a cloud 2.4 kilometer above the Earth's surface? Answer in m/s.
  32. physics

    in what specific way does light from distant stars and galaxies tell astronomers that atoms throughout the universe have the same properties as those on earth?
  33. science

    Which sequence shows the correct order of Earth’s geologic time intervals from oldest to youngest?
  34. Physics

    What is the magnitude of the momentum of the 0.057-kg tennis ball when it travels at a speed of 29 m/s? Earth is the frame of reference.
  35. science

    What is the gravitational potential energy of a 2kg ball on planet earth raised 15 meters in the air?
  36. astronomy/physics

    determine the mass of the earth from the known period (365.25 days) and the distance of the moon (3.84X10^3 km)
  37. PHYSICS

    What's the total mechanical energy of a 300kg satellite in circular orbit 1400km above Earth's surface?
  38. Biology

    Explain how life on earth is dependent on both polarity of covalent chemical bonds and hydrogen bonding.
  39. earth science

    Which one of the following is not left in the land as a result of continental glaciers? A. Erratics B. Drumlins C. Loess D. Eskers
  40. PHYSICS

    'if diametre of earth is reduced to half mass remains constant what is then duration of day and night'
  41. physics

    Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 5400km.
  42. science

    1.where is most freshwater found on earth? A.lakes and rivers B.oceans and seas C.Underground D.icecaps and glaciers
  43. Chemistry

    Gas particles are not found in which layer of Earth's atmosphere? A. exosphere B. mesosphere C. thermosphere D. magnetosphere I know it's not A.
  44. SCIENCE

    The smallest of the earth's oceans is the _______ Ocean a) Pacific b) arctic c) indian d) atlantic e)lagon B
  45. meteogology

    Does the equator receive perpendicular sun rays to the Earth's surface most of the 365 day year.
  46. earth science

    what is the process that binds sediments into sedimentary rocks? i think it is deposition, compaction, and cementation. am i correct???
  47. earth science

    astonomer think planets formed from interstellar dust and gased that clumped together in a process is called what?
  48. science

    whether a stone thrown upword with very high speed fall to the same point to the ground? If yes then why even the earth is in motion?
  49. Earth Science

    Please help me out with this question!: Explain how hurricanes form. http://en.wikipedia.org/wiki/Hurricane
  50. marketing

    What challenges do specialized magazines such as Mother Earth News face hen trying to entice advertisers?
  51. PHYSICS

    What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.
  52. physics

    Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 4800 km.
  53. physical/earth science

    what important nonmetal is in brilliant yellow acrylic paint that contains titanium dioxide
  54. science

    The______ is the center of the moon's shadow where the sun's light is completely blocked from view on earth.
  55. earth

    ¿EN QUE PUNTO DE GRAVEDAD SE PUEDE RETORNAR UN SATELITE ARTIFICIAL HACIA LA TIERRA? ¿EN EL PERIGEO O EN EL APOGEO?
  56. Physics

    The earth has a radius of 6380 km and turns around once every 24 hours. What is the average speed of a person resting at the equator?
  57. physics

    Using Kepler's constant (9.84 X 10^-14), calculate the orbital radius of an artificial satellite whose period of revolution around the Earth is 1.43 X 10^4s(3.64 h).
  58. PHYSICS

    What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.
  59. earth

    About how fast will it be traveling on average? Assume that its trajectory is close to a straight line. Give your answer in {\rm AU/yr} and in {\rm km/hr}.
  60. Science

    How long would a day be in seconds if the Earth were rotating so fast that objects at the equator were apparently weightless?
  61. Science

    Does the energy move from Earth’s surface and atmosphere out to space through radiation, conduction, or convection? Explain.
  62. Physics

    Your friend doesn't believe you when you tell her that the acceleration due to gravity on earth is the same for both light and heavy objects. How could you convince her?
  63. earth

    On the windward side of the mountain, should the relative humidity of the parcel change as it rises from 2000 m to 4000 m?
  64. world geography

    the word aborigine comes from the latin ab orgine and means: A)"the people" B)**"from the beginning" c)"out of the earth" D)"to the end"
  65. Physics

    The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s Thanks in advance
  66. Physics

    An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?
  67. physics

    1. At what distance above the Earth (mass of 5.97 x 1024 kg and radius of 6.38 x 106 m) would a satellite have a period of 125 min?
  68. science

    which of earth's spheres extends into all others? i think it would be the Biosphere because overlaps virtually the entire hydrosphere and portions of the atmosphere
  69. Science

    Give two reasons why so little is known about organisms from the Precambrian time, even though it was the longest period and early earth's history?
  70. SCIENCE

    The earth is a______.It has four different layers, some thicker than others.? a) spiral b) rotunda c) sphere d) globule Just need to know if my answer or right or wrong. Thanks! :) C
  71. science

    using the numerical scale, one foot on the map would equal how many miles on earth's surface? show how you got your answer?
  72. Science

    I am doing my homework and I need to know "Why is the angle of rays of sunlight so important in determining the amount of energy collected by the earth?"
  73. 10th grade

    A metroid entering Earth's atmosphere has a speed of 70.0 km/s and a kinetic energry of 2.56 X 10^15 J. What is the mass of the meteroid?
  74. physics

    the earth is approximately sphere of radius 6.37*10^6 meter.what is its surface area in square km? what is its volume in cubic km?
  75. Physics

    Calculate the earth's orbital angular speed in radians/sec due to its motion around th sun.
  76. physics

    Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 3.004km.
  77. math

    what is the linear velocity of a point in Sydney, Australia which is at latitude 33deg 55'S. Radius of earth is 6370km.
  78. science

    A type of igenous rock forming from the cooling of magma within the earth's crust is called_____. intrusive
  79. physics

    estimate the rotational kinetic energy of earth, assuming it to be a solid sphere of uniform density
  80. physics

    A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
  81. earth science

    Astonomers think planets formed from interstellar dust and gases that clumped together in a process called
  82. Geology

    Winds blow whenever there are: cold temperatures, pressure inequalities in the atmosphere, or the earth rotates on its axis
  83. Physical Science

    Energy from the sun reaches Earth mostly by A. conduction. B. convection. C. radiation. D. thermal expansion. I think it's A.
  84. earth science

    Which of the following is a biotic factor in an ecosystem? a.trees b.wind c.Precipitation amount d.sun light
  85. science -- urgent

    can you pleaseee list all the things that Earth needs to provide us with life?? like energy, carbon, and so on.. THANKS A LOT!
  86. PEOPLE, SCIENCE, AND THE ENVIRONMENT

    . If all life ceased on Earth, how quickly would the atmosphere become like that of Venus and Mars? Explain.
  87. SCIENCE

    Suppose an astronomer oberserves a huge solar flare. Predict its effect on Earth in the next day or so
  88. Natural science

    What might happen to earth if the temperature in the atmosphere rises by 5degrees and if the water in the ocean gets colder?
  89. Biology

    Which of the following biomes covers the largest area of earth? tundra marine-----> My answer grassland forest
  90. SCIENCE

    Suppose an astronomer oberserves a huge solar flare. Predict its effect on Earth in the next day or so
  91. Earth Science

    a sample of magma flows very quickly. Would you expect it to contain high or low amounts of silica? Why? please help
  92. Science

    If Earth's axis had no tilt, we'd only have spring and fall for seasons, right? But which hemisphere would get the vernal equinox and which would get the autumnal?
  93. Advance Biology

    I need help writting exactly 25 words to describe the relationship between CFCs and the Earth's protective ozone layer.
  94. algerbra 2

    3. Write the function R that models the total number of components that reenter the atmosphere around the earth each year.
  95. Science

    How will precession of the Earth's rotation axis affect the month when the Sun will be in the current constellation in the future?
  96. science

    what site would i go to to summerize the climate changes that have accured from the past to the present and predict what you think the Earth will look like into the 21st. century????
  97. science

    Would you say,as a whole,we who live on the earth,are living sustainable or unstainable lifestyles.Why? Also in what ways might we be wasting our natural capital?
  98. physics

    If the Sun shrank to the size of a black hole without losing any mass, what would happen to Earth's orbit?
  99. social studies

    Scientists think adding CO2 to the atmosphere will affect the earth's climate. What effect is predicted?
  100. Physics

    Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.