7 ms·

Undersea by rail. Ninety minutes from New York to Paris: 5600 km

by jafo 5y ago

bluGill 5y ago
Too bad we can't pull it off with current technology.
- jafo 5y ago
  Guess we will just fantasize about it in song then: https://www.youtube.com/watch?v=Ueivjr3f8xg https://www.youtube.com/watch?v=Ueivjr3f8xg The future is bright: wheels in space, underwater trains, and everyone gets a spandex jacket.
xpe 5y ago
According to "How long would it take to fall through the center of the Earth?" [1], it would take 2 * 42 min = 84 min, ignoring air resistance, and, (probably) survival of the passengers. [1] https://www.physicscentral.com/explore/poster-earth.cfm https://www.physicscentral.com/explore/poster-earth.cfm This approximation accounts for this fact: "As you fall there is less and less mass between you and the center so there is less and less to pull you down"
- xpe 5y ago
  More (interesting!) flaws of the 42 minute calculation are shown here: https://www.livescience.com/50312-how-long-to-fall-through-earth.html https://www.livescience.com/50312-how-long-to-fall-through-e... This approximation accounts for non-uniform density of the earth: > Klotz based his calculations on the internal structure of the planet as determined from seismic data. While the Earth's crust has a density less than about 187 lbs. per cubic foot (3 grams per cubic centimeter), Earth's center has a density of about 811 lbs. per cubic foot (13 grams per cubic centimeter). The density of the planet does not rise in a straightforward manner the farther down one goes — there is a sharp 50 percent increase in density at the boundary of the planet's mantle and its outer core about 1,800 miles (2,900 km) below Earth's surface. > Now, using a more realistic model of the Earth, Klotz finds the fall would take only about 38 minutes and 11 seconds, about 4 minutes faster than thought.
- el_nahual 5y ago
  Why wouldn't the passengers survive? Even though they will reach terrifying speeds, at no point will their acceleration exceed a relatively gentle 9.8ms^-2
  - throwaway98797 5y ago
    it gets quite warm down there.
ffhhj 5y ago
Enters The Ever Given.

Undersea by rail. Ninety minutes from New York to Paris: 5600 km

by jafo 5y ago

Undersea by rail. Ninety minutes from New York to Paris: 5600 km

bluGill 5y ago

Too bad we can't pull it off with current technology.

jafo 5y ago
Guess we will just fantasize about it in song then: https://www.youtube.com/watch?v=Ueivjr3f8xg https://www.youtube.com/watch?v=Ueivjr3f8xg The future is bright: wheels in space, underwater trains, and everyone gets a spandex jacket.

xpe 5y ago

According to "How long would it take to fall through the center of the Earth?" [1], it would take 2 * 42 min = 84 min, ignoring air resistance, and, (probably) survival of the passengers. [1] https://www.physicscentral.com/explore/poster-earth.cfm https://www.physicscentral.com/explore/poster-earth.cfm This approximation accounts for this fact: "As you fall there is less and less mass between you and the center so there is less and less to pull you down"

xpe 5y ago
More (interesting!) flaws of the 42 minute calculation are shown here: https://www.livescience.com/50312-how-long-to-fall-through-earth.html https://www.livescience.com/50312-how-long-to-fall-through-e... This approximation accounts for non-uniform density of the earth: > Klotz based his calculations on the internal structure of the planet as determined from seismic data. While the Earth's crust has a density less than about 187 lbs. per cubic foot (3 grams per cubic centimeter), Earth's center has a density of about 811 lbs. per cubic foot (13 grams per cubic centimeter). The density of the planet does not rise in a straightforward manner the farther down one goes — there is a sharp 50 percent increase in density at the boundary of the planet's mantle and its outer core about 1,800 miles (2,900 km) below Earth's surface. > Now, using a more realistic model of the Earth, Klotz finds the fall would take only about 38 minutes and 11 seconds, about 4 minutes faster than thought.
el_nahual 5y ago
Why wouldn't the passengers survive? Even though they will reach terrifying speeds, at no point will their acceleration exceed a relatively gentle 9.8ms^-2
- throwaway98797 5y ago
  it gets quite warm down there.

ffhhj 5y ago

Enters The Ever Given.