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A strip of thickness $40\:mm$ is to be rolled to a thickness of $20\:mm$ using a two-high mill having rolls of diameter $200\:mm$. Coefficient of friction and arc length in $mm$, respectively are

  1. $0.45\:\text{and}\:38.84$
  2. $0.39\:\text{and}\:38.84$
  3. $0.39\:\text{and}\:44.72$
  4. $0.45\:\text{and}\:44.72$
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