Physics
Red light is used for signals because it has

High intensity
Long wavelength
High frequency
Low refraction in the medium

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Physics
Should cars have bumpers that collapse under impact?

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
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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Physics
What is the direction of torque?

Opposite to the direction of applied force
Perpendicular to the direction of applied force
Same as the direction of applied force
Parallel to the radius

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