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Spider is able to see only half of the sphere which is topmost hemispherical surface.
when insect enters in bottom hemispherical surface it becomes invisible for the spider.
a/c question insect is travelling vertical circular path it travels pi/4cm in 1sec.
then it will travel 2pi r dist i.e. 40picm in 160sec. hence it will travel pi r i.e20pi (half circle) in 80s.
Spider is able to see only half of the sphere which is topmost hemispherical surface. when insct enters in bottom hemispherical surface it becomes invisible for the spider. a/c question insct is travelling vertical circular path it travels pi/4cm in 1sec.then it will travel 2pi r dist i.e. 40picm in 160sec. hence it will travel pi r i.e20pi (half circle) in 80s.
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