In reality, there are two reasons gravity trains do not exist. First, a lengthy transit distance would pierce the Earth’s mantle and traverse a region where rock is more fluid than solid. No materials are known that would withstand the tremendous heat and pressure in the inner core. Temperature is estimated as 5,700 K (5,430 °C; 9,800 °F), and pressure as high as about 330 to 360 gigapascals (3,300,000 to 3,600,000 atm). Secondly, frictional losses would be significant. Rolling friction losses could be reduced by using a magnetically levitated train. However, unless all air is evacuated from the tunnel, frictional losses due to air resistance would render the gravity train unusable. Evacuating the atmosphere to make it a vactrain would eliminate this drag but would require additional power. Such objections would not apply for solid planets and moons that do not have an atmosphere.
Ep. 143 – Conjuring God
Ep. 142 – A Shiver of Sharks
Ep. 141 – The Young Puppy Saloon
Ep. 140 – The Fulcrum Rope
Ep. 139 – Give Peas a Chance
Ep. 138 – Surf the Ridge
Ep. 137 – The Environmental Colossus
Ep. 136 – Sun, Surf, Music, and Beer
Ep. 135 – The Symphonic Ballet of Leaf Blowers
Ep. 134 – Born to be Tiled
Ep. 133 – Duck Blood Soup
Ep. 132 – Neighbor's Son's Unfallen Testicles
Ep. 131 – Charlene, the two legged donkey
Ep. 130 – Unspeakable Goo On Ice
Ep. 129 – How Now, Brown Trout?
Ep. 127 – Visiotherapist
Ep. 126 – Wolves of Irrelevancy
Ep. 125 – Tex-Mex Messaging
Ep. 124 – Tinkering and Thinkering
Ep. 123 – Dumpstergate
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