If you dig a hole in the center of the earth and throw a pistol down, you can reach the bottom in 42 minutes
American geographers have successfully performed a calculation that calculates how long it would take for a land to fall at the speed of a free fall if it had a hole in the center of the earth.
Different from other calculations, this time scholars took into account both air resistance and possible friction resistance.
Traveling through the center of the earth takes 1.8 years. In other words, according to the calculations of these American geographers, it takes a person so long to cross the center of the earth. Moreover, the deeper the landing position, the greater the gas pressure and the greater the resistance to movement.
It will take almost two years for a human body to fall to the center of the earth, but it cannot return to the surface from another center. If all the parameters known to mankind are not taken into account, and the earth is just such a standard model, and the air filling the entire central tunnel is not taken into account, it can be dropped to the center of the earth in 42 minutes.