Physics
Circuit breaker usually operate under

Sub-transient state of short-circuit current
Transient state of short-circuit current
After D. C. component has ceased
Steady state of short-circuit current

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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 the colliding car would then ram into the occupants and kill them
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

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