If everything in the universe, at the same time, shrunk to half its size...how would you know?

Answer 1

You'd have to take into consideration physical constants, such as speed of light or gravitational constant, before you could jump into the conclusion that "nobody would tell the difference". If you adjusted all the constants and masses, then, yes, nobody could tell the difference. But it's far from obvious on just how to adust all the necessary constants, and there may be more that we don't even know about.

This is not a silly question at all, but a very important one in physics. For this reason, I'm giving this one a star.

Answer 2

Using the speed of light as a measuring instrument perhaps? Or gravitational acceleration as well, which is not a linear relationship between the distances between to bodies of masses, its an inverse square. Basically, if the earth changes in size (mass and volume), gravity doesn't change in a linear manner, so the gravitational acceleration wouldn't be the same for us

Answer 3

Based on Newton's Law that matter is neither created nor destroyed, then everything would have to have greater density. That means that you'd be about twice the weight you are now, I believe. You'd feel a lot heavier, and it'd probably be harder to move around. Everything would be denser/thicker.

Answer 4

You wouldn't. Because there is nothing you can compare to htat you've really shrunk.

Answer 5

if you spoke or listened to someone familiar their voice would be higher in pitch because of the smaller larynx

Answer 6

yobigmamma would bez 220 poundz

Answer 7

You wouldn't know. . Relativity can shrink things without them knowing.

Answer 8

unless the shriking included units of measurement, all you'd have to do is measure yourself.

Answer 9

You wouldn't because it would all be relative.