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| Re: New Jersey Claims that Reefed Subway Cars Not Living Up to Expectations (741568) | |||
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Re: New Jersey Claims that Reefed Subway Cars Not Living Up to Expectations |
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Posted by JohnL on Sat Feb 7 22:03:10 2009, in response to Re: New Jersey Claims that Reefed Subway Cars Not Living Up to Expectations, posted by GP38/R42 Chris on Sat Feb 7 17:34:39 2009. If a car lands upside down and another car lands on top of it, it’s not unlikely that the bottom car will be damaged or crushed.But the weight of the water (ie the pressure) has nothing to do with the crushing. Because the pressure is equal all the way around. Human divers can go to multiple hundreds of feet (with significant advanced training) because they can equalize the pressure in the air spaces in their bodies to the surrounding ocean. In fact the impact of one car landing on top of another in the ocean is less than in air because: a) Water has much more resistance than air, so terminal velocity is much less. b) The weight of the cars is less in water because of Archimedes’ principle. |
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