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  1. A polished metal plate has a rough and black-spot. It is heated to 1400 K
  2. The potential energy of a weightless spring compressed by a distance D is proportional
  3. Imagine a light planet revolving around a very massive star in a circular
  4. According to Hook’s law, force is proportional to
  5. The number of beta particles emitted by a radioactive substance is twice the number