Physics
Should cars have bumpers that collapse under impact?

No, since it would be very expensive to get the car repaired
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 the colliding car would then ram into the occupants and kill them

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The human body maintains a constant temperature
The carpet is a better conductor of heat than the stone
The floor and carpet are at different temperatures
The stone conveys the heat away from the feet more rapidly than the carpet

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