Physics
The earth is a

Good reflector of heat
Bad absorber and bad radiator of heat
Good absorber and good radiator of heat
Non-absorber of heat

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

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