whats the diametre of the earth?
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Your answer is here\n\nhttp://geography.about.com/library/faq/blqzdiameter.htm
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The earth is APPROXIMATELY round due to gravitational forces.
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The Earth rotates 360 degrees (2 pi radians) in 23 hours, 56 minutes, and 4.09054 seconds.  In other words, its angular velocity is (2 pi)/(86,164.09054 sec).  You could google the answer this one, since the Earth's angular velocity is a well known constant (7.292115 x 10^-5 rad/sec).\n\nThe equatorial radius is 6,378.137 km.  Your distance from the Earth's rotational pole can be found by multiplying the equatorial radius by the cosine of your latitude.  For example, if you're located at 38 degrees N latitude, your distance from the rotational axis is 6,091.59 km.\n\nYour linear speed is found by multiplying your distance from the Earth's rotational axis by the angular velocity.  For example, at 38 deg N latitude, your velocity would be 444.2 meters/sec.\n\nYou have to know the latitude a person is located at in order to calculate their velocity.  You can find the approximate latitude on any globe.  An online map or a Gazeteer could give you more exact coordinates.  Googling the coordinates for the local airport would also get you a very accurate latitude for your city.
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The earth is round. There are some physical proofs below, assuming you don't trust the pictures of the Earth taken from the various space programs.
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Let's just talk about Earth. The earth's diameter is 12756 km. Its circumference is pi x 12756 = 40074 km. The earth spins 1 round in 24 hours. That's 1700 km/h, or 472 m/s. If it rotates in an OPPOSITE direction, it's like the Earth is rotating at 944 km/s and suddenly stops. What happens? You fly through the air at 944 km/s. All the houses fly through the air at 944 km/s. Whole forests fly at 944 km/s. Even whole mountain ranges and mountain tips fly at 944 km/s. The ocean's waters fly backward at 944 km/s. Talk about a uber tsunami. I don't know what the friction of air against these object would do to them. Can anyone solve that? Even the Earth's crust might become detached with its outer mantle, I think. Lava breaks out everywhere, global earthquakes... In short: All hell breaks loose. Man, that's even worse than the Death Star. Superman actually does that to Earth in one of his movies. He's a major nut!
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The volume of Earth (according to a Google search) is approximately 1,097,509,500,000,000,000,000 cubic meters(meters ^ 3) when you use the equation V = 4/3  x Radius ^ 3 and assume that the Radius is 6.37 x 106 m\n\n1 cubic meters = 264.172051 US gallons\n\n1 097 509 500 000 000 000 000 (cubic meters) = 2.89931336 × 10^23 US gallons
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I feel the question should be what is the circumference of earth -\nIt is -\nThe average radius of the Earth is 3,959 miles (6,374 kilometers).\nThe equitorial diameter of the Earth (distance from one side of the Earth to the other at the equator) is about 7,926 miles.\n\nThe ratio of the circumference to the diameter of a circle (circumference/diameter) \nis written as the symbol pi. \nPi is approximately 3.141592.\n3.14159265\n3.1415926535\n\nTherefore, to determine the circumference from the diameter given above:\nequitorial diameter x 3.141592 = equitorial circumference\n| |\n7,926 x 3.141592 = 24,900\n| |\nThe earth has a circumference of approximately 24,900 miles.\n\n\nMore precisely the circumference of the earth (or distance around earth)\nat the equator is 24,902 mi / 40,076 km. \n\nso the answer is 24,902 miles or 40,076 kms.
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Mean Equatorial Radius\n71,492 km\n(11.209 of Earth's radius)\n\n142,984 km diam *3.14\n\n\n448,969.76 km is the cirumference\n\nif you search for astronomy pic of the day then search jupiter everyting is there.  Plus some relly awesome pictures
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the circumference of the earth at the equator is exactally 24,902 mi (40,076 km)
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The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).
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Equatorial diameter 6,804.9 km (4228.4 Miles)\n(0.533 Earths)\nPolar diameter 6,754.8 km (4197.2 Miles)\n(0.531 Earths)\nOblateness 0.007 36\nSurface area 1.448×108 km2 (55.907 Million Square Miles)\n(0.284 Earths)\n\n\n"Mars-5-inch-thing" Sure... but in which category of questions are we?
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Earth is an oblate spheroid, resembling a sphere flattened at the poles.\n\nThe volume of an oblate spheroid is\n\n    V = 4/3 X 3.14 X a^2 X b\n\nwhere π is the mathematical constant pi, and a and b are the equatorial and polar radii.\n\nSubstituting a = 6,378,135 m and b = 6,356,750 m\n\nThe Huge EarthThe mean radius of the earth is approximately 6.4 million meters (exact = 6.37 x 106 m). Its volume is then:\n\n(4/3) x 3.14 x 64000003 m3\n\nThis comes to 1,097,509,500,000,000,000,000 cubic meters.
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the tilt of the earth and when it revolves around the sun
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Because of the curvature of the earth.
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Earth ranges from 7,926 miles to 7900 miles, depending on your location.\n\nThis is approximately 12,756km
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north ,south, east and west are compass directions\n \ndown is toward the center of the earth\n\nup is toward space
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Measurements. The acceleration of gravity is:\ng = G*m/R^2\nWhere G is the gravitational constant 6.67*10^-11 N*m^2/s^2, m is the mass of the planet, and R is the distance between yourself and the planet. For the surface of the Earth, m and R are approximately:\nMe = 5.97*10^24 kg\nRe = 6.38*10^6 m\nUsing this, you should get about 9.8 m/s^2.