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  1. A stone tied to the end of a string of 1 m long is whirled in a horizontal circle
  2. Two small spherical shells A and B are given positive charges of 9C and 4C
  3. If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
  4. Wires A and B are made from the same material. A has twice the diameter and three times
  5. The area of cross-section of a steel wire (Y=2.0×10¹¹ N/m²) is 0.1 cm².