Physics
Should cars have bumpers that collapse under impact?

Yes, since they help to absorb the impact of a collision and keep the occupants safe
No, since the colliding car would then ram into the occupants and kill them
Yes, since the offending car should get damaged and pay for the mistake
No, since it would be very expensive to get the car repaired

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Physics
Inside an aeroplane, flying at a high altitude,

normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
the pressure is the same as that outside.
normal humidity and partial vacuum are maintained.

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