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  1. A ball is dropped into a well in which the water level is at a depth h below the top
  2. An ideal heat engine works between temperature T₁=500 K and T₂=375 K.
  3. The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν
  4. A milli ammeter of range 10 mA has a coil of resistance 1 ohm
  5. The acceleration of an electron in an electric field of magnitude 50 V/cm,