Physics
Should cars have bumpers that collapse under impact?

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
Yes, since they help to absorb the impact of a collision and keep the occupants safe
No, since it would be very expensive to get the car repaired

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Physics
The earth is a

Good reflector of heat
Non-absorber of heat
Bad absorber and bad radiator of heat
Good absorber and good radiator of heat

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