How much does the Earth Weigh?

Answer 1

It is really really heavy.

Answer 2

It would be more proper to ask, "What is the mass of planet Earth?"1 The quick answer to that is: approximately 6,000,000,000,000,000,000,000,000 (6E+24) kilograms.

The interesting sub-question is, "How did anyone figure that out?" It's not like the planet steps onto the scale each morning before it takes a shower. The measurement of the planet's weight is derived from the gravitational attraction that the Earth has for objects near it.

It turns out that any two masses have a gravitational attraction for one another. If you put two bowling balls near each other, they will attract one another gravitationally. The attraction is extremely slight, but if your instruments are sensitive enough you can measure the gravitational attraction that two bowling balls have on one another. From that measurement, you could determine the mass of the two objects. The same is true for two golf balls, but the attraction is even slighter because the amount of gravitational force depends on mass of the objects.

Newton showed that, for spherical objects, you can make the simplifying assumption that all of the object's mass is concentrated at the center of the sphere. The following equation expresses the gravitational attraction that two spherical objects have on one another:

F = G * M1 * M2 / R2
R is the distance separating the two objects.
G is a constant that is 6.67259x10-11m3/s2 kg.
M1 and M2 are the two masses that are attracting each other.
F is the force of attraction between them.
Assume that Earth is one of the masses (M1) and a 1-kg sphere is the other (M2). The force between them is 9.8 kg*m/s2 -- we can calculate this force by dropping the 1-kg sphere and measuring the acceleration that the Earth's gravitational field applies to it (9.8 m/s2).

The radius of the Earth is 6,400,000 meters (6,999,125 yards). If you plug all of these values in and solve for M1, you find that the mass of the Earth is 6,000,000,000,000,000,000,000,000 kilograms (6E+24 kilograms / 1.3E+25 pounds).

1 It is "more proper" to ask about mass rather than weight because weight is a force that requires a gravitational field to determine. You can take a bowling ball and weigh it on the Earth and on the moon. The weight on the moon will be one-sixth that on the Earth, but the amount of mass is the same in both places. To weigh the Earth, we would need to know in which object's gravitational field we want to calculate the weight. The mass of the Earth, on the other hand, is a constant.

Answer 3

To answer your question, you'd have to supply an exact day and time. If there are 2000 airplanes in the air and a billion birds flying around, then it would be lighter weight than it would be when they all land, and weigh the earth down more. Give me a precise time and date and I'll give you an exact weight. Oh, and are you talking about weighing it on a pound scale? If so, I'll run out and buy one.
Shoot, LaineeTheCat spoiled my answer. Where did she come from?

Answer 4

technically the earth has no weight because weight is a measurement based on the earth's pull on an object. it does have a weight in relation to say the sun, but this measurement would be meaningless to us because we don't live on the sun, and its gravitational pull is much greater than the earth's.

Answer 5

if I can borrow the scale from you so i can tell you how much this earth weigh

Answer 6

earth:
Volume 1.083 207 3×1012 km³
Mass 5.9742×1024 kg
Density 5,515.3 kg/m³

Answer 7

I think I know answer from a source.
Volume: 1,083,230,000,000 cubic km
Density: 5.52
Mass: 5,980,000,000,000,000,000,000 metric tonnes