Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail

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Physics
The bats can fly in the dark because

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

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