Re: What would happen if everyone in China jumped and landed at the same time?

well let's do some math and guesstimations:

~1,321,851,888 people in China (according to July 2007 estimates)

Now the mean weight of a white adult male American in the 21st century is 193 lbs, and female is 161 lbs. Now obviously most Chinese people are not as well fed as Americans, so let's be conservative and use the mean weight of Americans from 10-15 years ago, which is 183 lbs for men and 151 lbs for women.

So that makes the average for all people 167 lbs, 75.75 kg (assuming a 50/50 sex split). So the population of China would weight approximately 220,749,265,296 kg or around 221 million metric tons. So the force exerted by all of the Chinese population jumping, then landing (due to gravity) would be 2,163,342,799,901 Newtons.

Now considering that the Earth's oceans alone have a mass of 1.4 × 10^21 kg, which is only about 0.023% of the Earth's total mass, then the idea of a mass shift of only 2.2 x 10^11 probably won't make much of a difference to anything, be it the earth's tectonic plates or anything else.

Re: What would happen if everyone in China jumped and landed at the same time?

Quote:

Originally Posted by kwajo

well let's do some math and guesstimations:

~1,321,851,888 people in China (according to July 2007 estimates)

Now the mean weight of a white adult male American in the 21st century is 193 lbs, and female is 161 lbs. Now obviously most Chinese people are not as well fed as Americans, so let's be conservative and use the mean weight of Americans from 10-15 years ago, which is 183 lbs for men and 151 lbs for women.

So that makes the average for all people 167 lbs, 75.75 kg (assuming a 50/50 sex split). So the population of China would weight approximately 220,749,265,296 kg or around 221 million metric tons. So the force exerted by all of the Chinese population jumping, then landing (due to gravity) would be 2,163,342,799,901 Newtons.

Now considering that the Earth's oceans alone have a mass of 1.4 × 10^21 kg, which is only about 0.023% of the Earth's total mass, then the idea of a mass shift of only 2.2 x 10^11 probably won't make much of a difference to anything, be it the earth's tectonic plates or anything else.

Hope the numbers are true, but besides that, good work! I like responses like this. Puts PLANET EARTH in perspective!