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

Above a certain minimum value depending on amount of water in the pail
Below 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
Which is evidence that supports the dynamo theory?

Granite and basalt conduct electricity
Earth's outer core contains liquid that conducts electricity
Convection occurs in Earth's inner core
Earth's core contains a large amount of iron

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