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  1. The mean radius of the earth is R, its angular speed on its own axis is ?
  2. A particle with total energy E is moving in a potential energy region U(x)
  3. A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N
  4. The alternating current in a circuit is given by I=50 sin314t. The peak value
  5. When a wire of uniform cross-section a, length l and resistance R