Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

The ball will travel towards the center of the circle and fall down
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
It will fall down at the same place where the string breaks
None of these

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Physics
Which is evidence that supports the dynamo theory?

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

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