– Raw product weight vs Earth weight

Question

Lets suppose the Earth weighs 100,000 lbs. (just follow along).

I want to build a car from raw materials. The car will weigh 4000 lbs.

Does the the weight of the Earth change at that point or do the materials of the car equal the final weight of the car?

Same with humans. A baby weighs 10lbs at birth but when grown is 250lbs.

I suppose my question is that is the Earth’s weight a set weight or does is fluxuate barring any meteors an space junk.

In: 1

Answer 1

In your example, the car weighs a considerable percentage of the earth’s weight. In reality, all the products of the world weigh 0.00000001% of the earth’s mass, and because the earth’s mass is only known with 99.9% accuracy, it won’t affect the mass that we observe.