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  1. The area of cross-section of one limb of an U-tube is twice that of the other.
  2. An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
  3. As a result of interference of two coherent sources of light, energy is
  4. If dimensions of critical velocity of a liquid flowing through a tube are expressed
  5. A resistance of 20 ohm is connected to a source of an alternating potential V