You sould try to have very light pressure on your feet when you sprint. But some people are just heavier on their feet then others. What takes the most pressure is the heal of the foot because it usually hits the ground first. If you want to do sprinting then make sure you get a shoe with good support in the heals. When it comes to running shoes I've found you do get what you pay for.
Depends on the size of the foot - a child's food will take far less pressure to crush than an adult man's foot.
about 2 psi. (0.5 psi / foot of depth)
40 pounds
The blood to the foot is temporarily blocked and that takes the control of the muscles away, as soon as blood flow is reurned, the muscles have control again.
it takes 76 lbs of pressure to collapse/crush one's windpipe
a gallon or so
it takes 400 dollars
None at all.
approximately 12 psi when standing on all fours
fibula tibula
usually a lot of pressure but it depends on the bone. Example: It takes 12-16 pounds of pressure to break a knee.
An inch is a unit of length. A foot pound is a unit of pressure. The two units are therefore incompatible.