Physics
Damp clothes are dried in spin dryers by the action of

Central forces
Non central forces
Centripetal forces
Centrifugal forces

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Air-gaps are necessary for bearing the weight of running train
Steel can be saved
Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided

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