Physics
Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water
It produces corrosion

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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 it would be very expensive to get the car repaired
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

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