Physics
Isotopes of an element contain

equal number of nucleons
equal number of protons and electrons
the same number of protons but different number of neutrons
the same number of neutrons but different number of protons

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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 fall down at the same place where the string breaks
None of these
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

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