Physics
Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

K1k2/k1+k2
2k1k2/k1+k2
None
K1+k2/k1k2

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water
The sea is-deeper than the river

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