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  1. A body cools in 7 minute from 60⁰C to 40⁰C. What time, in minute does it take to cool
  2. Two metal rods 1 and 2 of same lengths have same temperature difference
  3. A radioactive nucleus emits a beta particle. The parent and daughter nuclei are
  4. Which one of the following statement is FALSE ?
  5. A particle moves from position r₁ = 3i + 2j -6k to position r₂ = 14i + 13 j+ 9 k