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. 183 – It's Not That Lemony!
Ep. 182 – A Dozen Decent Docents
Ep. 181 – Manipulation Under Anesthesia
Ep. 180 – Jean-Claude Swan Dam
Ep. 179 – Porcinematic
Ep. 178 – Louisianimal
Ep. 177 – The Apocalypse and Raking: The Quixotic Relationship Between Leaves and the Human Race
Ep. 176 – Take the Cannoli
Ep. 175 – I Love A Good Conversion
Ep. 174 – Whizzes and Clicks
Ep. 173 – Clam the Hammer Down
Ep. 172 – Encore Chicken
Ep. 171 – Use Your Nose Horn
Ep. 170 – Coconut Grass
Ep. 169 – Needle in the Neck
Ep. 168 – Treachery Not in the Age of Electronics
Ep. 167 – Window Pain
Ep. 166 – Independents' Day
Ep. 165 – Early Ankle Digestion
Ep. 164 – Dancing with the Fishes
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