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problem in revolution of earth due to increasing of mass

 
 
Reply Sat 22 Dec, 2012 10:06 am
Our Earth has a specific mass is approximately 6*10^24 kg and it also have a specific speed of 108,000km/hr but the increased in population also increases the Earth's mass so, does the increase in Earth's mass can effect the time of Earth's Revolution around the sun?
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Type: Question • Score: 2 • Views: 1,167 • Replies: 5
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Zarathustra
 
  0  
Reply Sat 22 Dec, 2012 01:37 pm
@Prithul Mukherjee,
Well you could consider that if that is true and there is an issue we can just get all the people running in one direction or the other (depending on if we want to speed up or slow down rotation).

Or you could consider that since people are made up of things already part of the mass of the Earth then no matter how many people, mass would not increase. In fact taking into account all the waste heat generated in all the “people building” (some of which would be released into space) more people might just reduce the mass of the Earth.

In a more serious light, I have never found any scholarly studies that show if and how much mass the Earth gains or lost on average in a year. Most only try to answer the question of accumulated matter from space but don’t weight that against loss of matter (atmospheric gas) and loss of energy (also mass) as infrared radiation, etc.

I think a bigger problem is that the mass of the Earth is increasing because of the weight of all the many different identities that many individual posters use on web forums. One anonymous identity just never seems to be enough.
roger
 
  2  
Reply Sat 22 Dec, 2012 02:41 pm
@Zarathustra,
Kinda like measuring your walking distance with GPS while doing circuits around your cruise ship. Maybe you finally decide you just can't get there from here, and give up.
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jespah
 
  2  
Reply Sat 22 Dec, 2012 02:45 pm
@Prithul Mukherjee,
Prithul Mukherjee wrote:
... the increased in population also increases the Earth's mass so...


No, it doesn't. People are made up on Earth stuff. Increasing population does not increase the mass of the Earth. The carbon, hydrogen, etc. is just moved more into human bodies than in rocks, earthworms, tiddlywinks or lanolin.
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raprap
 
  1  
Reply Mon 24 Dec, 2012 02:54 am
@Prithul Mukherjee,
1st most mass on the Earth remains constant (the mass of people on the Earth are made of Earthstuff)

2nd if there are 6 billion people on the Earth and Everyone has a mass of 100 kg, that accounts for 6E11 kg. If the mass of the Earth is 6E24 kg as your said the total mass of people on the Earth is 1E-13 of the total mass. that is less then 1 part per trillion.

Rap
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maxdancona
 
  1  
Reply Wed 26 Dec, 2012 11:00 pm
@Prithul Mukherjee,
1. The mass of an object orbiting the Sun has nothing to do with the time it takes to orbit. A pebble with a mass of 1 gram will orbit in exactly the same amount of time that the Earth does. This is a consequence of Kepler's third law.

What matters is the distance from the Sun. Specifically it is the "semi-major axis" which for a circular orbit is the distance of the object from the center of the Sun (orbits can be non-circular meaning that the distance of the sun would change at different points in the orbit).

So an increase in Earth's mass has no effect on the time of the Earths rotation around the Sun.

2. Increasing the population doesn't increase the Earth's mass. The law of conservation of mass says that mass can not be created or destroyed.

People get all of their mass from atoms that make us up. We get the atoms from food we eat, water we drink and air we breath. Having more people means more of the atoms on Earth will be part of people (rather than part of something else), but it doesn't increase the number of atoms on the Earth and it doesn't change the mass of Earth.

The mass on Earth is the same no matter how many people there are.

3. Of course the Mass of the Earth can increase when things from space fall down to Earth, and it can decrease when when matter is sent up to space from Earth. I believe the mass of Earth is increasing on net (not that dramatically) as the Earth get's hit by matter from space.

This still won't affect the orbit no matter how much the mass of Earth increases.
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