what is the wieght of the earth?

Answer 1

The actual question you want to answer is, "What is the mass of the earth?" since the weight of an object is relative to the gravitational force of the mass pulling against it.

According to Google Calculator:

mass of Earth = 5.9742 × 10^24 kilograms

Answer 2

earth is best measured by mass. weight varies depending on gravity.

Technically, the earth weighs nothing, thanks to that old scientific chestnut that defines weight as a measure of the earth's gravitational pull on another mass.

The real question is: How strongly is the earth and its terrestrial matter attracted to itself -- or, more simply put, what is the earth's own mass? The answer is incomprehensibly huge and impressive enought to toss out with great effect at cocktail parties: 5,972 sextillion metric tons. In pounds, that would be 13,160 followed by 21 zeros.

The figure only came to light a year ago as a bonus factoid while Jens Gundlach, a University of Washington professor of physics, was busy solving a different mathematical conundrum altogether: finding the precise value of the 300-year-old unknown called Newton's Gravitational Constant.
What is the mass of the Earth?
http://library.thinkquest.org/23678/earthmass.html