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2. it is...

  • ...out from the middle
  • ...high-->low
  • ...low-->high
  • ...none of these

3. the sizes of the blocks have to be...

  • equal distance apart
  • touching
  • in proportion
  • equal

4. what happens to some of the energy?

  • it is transferred to sound energy
  • it is transferred to heat energy
  • it is transferred to chemical energy
  • it disappears

5. producer is which bar?

  • bottom
  • second
  • top
  • third
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