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. 101 – Swans Chasing Ducks Over Ice
Ep. 100 – You Can Love a Wolf
Ep. 99 – Kidnap Baby Hitler
Ep. 98 – Ninus Mine Degrees
Ep. 97 – The Integrity of the Toga
Ep. 96 – Say It Ain't So, Joe
Ep. 95 – A Magic Carpet Ride of Language and Subtlety
Ep. 94 – The Shiny Keys to the Press
Ep. 93 – Impeach Cobbler
Ep. 92 – Mule Hair
Ep. 91 – An Audience of One
Ep. 90 – Spray it, Pack it, Rub it
Ep. 89 – Carnival Barker
Ep. 88 – Clip the Whisk
Ep. 87 – Broader Rugged Undulations
Ep. 86 – Blue Czechs
Ep. 85 – The Occasional Monkey
Ep. 84 – Lower Mower Stower
Ep. 83 – The Unknowing Knoller
Ep. 82 – I hate polishing silver I stole
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