Physics
Formula for distance is

Speed x time
Speed x acceleration
Time / speed
Velocity / speed

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Physics
The bats can fly in the dark because

They can see the objects in darkness
They generate flashes of light
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
No radiation of heat takes place
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media

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