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. 122 – If you're thirsty, don't drink Scotch
Ep. 121 – Dental Nipple Clips
Ep. 120 – The Quick and the Dead
Ep. 119 – Let's Get Stinko
Ep. 118 – The Goldilocks of Office Life
Ep. 117 – Celestial, but also Practical and Useful
Ep. 116 – Two Fish with One Worm
Ep. 115 – Overwhelming Insidious Lack of Control
Ep. 114 – A Web of Spiders
Ep. 113 – He slapped him with a black snake
Ep. 112 – Elemeno, my dear Watson
Ep. 111 – Writ Large on the Tablets of Time
Ep. 110 – Plan B Better Be Better
Ep. 109 – Double Trunked Tree
Ep. 108 – Time is a Sequence of Atoms...and Eves
Ep. 107 – Square Cavage
Ep. 106 – Clack – Clack – Clack
Ep. 105 – Dead Squirrel Brine
Ep. 104 – Synoptic Truck Rest
Ep. 103 – The Corner Cracked Off
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