My robot friend is 6,6 centimeters in height. So I have wondered how strong a planet’s gravity must be to squash a human into this size? 5 times the gravity of the Earth? 6 times? More? Less?
Very strong, probably 20 times
How strong a planet’s gravity must be to squash a human into a size of 7 centimeters in height?
Very strong, probably 20 times
Category: squash |
The theoretical maximum force sustainable by a vertebral body (Fmax) was estimated from dual-energy x-ray absorptiometry (DXA) bone mineral density (BMD) scores. Regression equations were calculated based on graphical results of the maximum force sustained by a vertebral body as a function of BMD (Ebbesen, Thomsen et al. 1999).
Early experiments showed that untrained humans were able to tolerate 17 g eyeballs-in (compared to 12 g eyeballs-out) for several minutes without loss of consciousness or apparent long-term harm.[13] The record for peak experimental horizontal g-force tolerance is held by acceleration pioneer John Stapp, in a series of rocket sled deceleration experiments in which he survived forces up to 46.2 times the force of gravity for less than a second. Stapp suffered lifelong damage to his vision from this test.[14]
Everything in the human body is easily crushed except the bones. But deformation, which begins at about 15 g will only tear soft tissues above 50 g. Princess Diana suffered about 70 g’s in 1 second which severed major arteries and instant death. But she was not crushed.
To actually crush bones into 6 or 7 centimeters would require between 5,000 and 20,000 g’s of acceleration or gravity depending on the density of the bone and the duration of acceleration/gravity.
References :
http://nof.confex.com/nof/2005/techprogram/P314.HTM
http://hypertextbook.com/facts/2004/YuriyRafailov.shtml
http://en.wikipedia.org/wiki/G-force
Very strong, probably 20 times
References :