It is animated now but before that it was filmed using 1:32 scale models.
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Any foreign objects in a gas tank will eventually clog the out take of the tank and cause the fuel pressure to drop effectively preventing the gas from reaching the engine and stalling the car. Removing them is costly since it requires removing the gas tank to drain it and clean the foreign objects out.
On older cars / trucks that do not have a coolant recovery tank you should fill the radiator to approximately one inch below the opening. ( when the engine is COLD } On more modern cars / trucks that have a coolant recovery tank, the radiator should be completely filled and the recovery tank should be filled to the full cold mark. You should only do this when the engine is cold to avoid personal injury. Why is the cooling system low? A pressure test should be performed and all leaks repaired.
Something not everyone takes into account is that every molecule has a weight, even the molecules that make up air. It may not be noticeable, but it's definitely present. So if by "empty tank" you mean "a tank containing no molecules", and it were compared to a tank filled with air, or "a tank containing at least one molecule", then you can see that a tank filled with air will weigh more than an empty tank (although the difference may be very very small).
No, but it will wreck your hot water tank. Every tank should have the gas or electrical shut off, the water valve to tank shut off, and the tank drained ONCE EVERY YEAR!!! The rust buildup on the bottom of the tank enhances the speed of the tanks demise.
George Westingtonhouse Jr. (NOT WASHINGTON) is a famous inventor. 1846-1914. He invented quite some inventions like the air brake, the rotary steam engine, etc. His enemy was Thomas Edison.