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Help!!!help!!!facing a problem.

Submitted by iceberg25 on

help.....i am a first year undergraduate student.
how do i can design a delay switch mechanism using a dashpot.with the condition below:
a)time delay required 3seconds.Diameter at mechanism 74cm use suitable viscocity.
b)propose a refinement so that switch rate progresively slower.
so,where can i get this type of the information,how can start to do it?
thanks...