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. 163 – Scored Some Lunkers
Ep. 162 – Not Worth a Bucket of Spit
Ep. 161 – Life is good, albeit out of focus
Ep. 160 – Man To Your Right Shuffles
Ep. 159 – The Hustle is Multidimensional
Ep. 158 – The Beer is the Same; It's You That's Different
Ep. 157 – Sandy on the Way Home
Ep. 156 – Peastone Cowboy
Ep. 155 – Whistlethon
Ep. 154 – Smirk to Irk
Ep. 153 – The Sustainable Choice
Ep. 152 – Overwhelmed by the Joy
Ep. 151 – 82º of Kevin Bacon
Ep. 150 – I Had a Synapse
Ep. 149 – She was a good sport about it, and then we drove home
Ep. 148 – Two Legs Ain't No Picnic
Ep. 147 – Trout Jitsu
Ep. 146 – Down Where The Rats Ran
Ep. 145 – A Family of Sweepers
Ep. 144 – Don't hesitate. Lubricate.
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