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  1. Radius of first orbit of the electron in a hydrogen atom is 0.53 Å. So the radius
  2. Four indentical thin rods each of mass M and length l, form a square frame
  3. A circular road of radius 1000m has banking angle 45°.The maximum safe speed of a car
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  5. A motor-cyclist drives a motor cycle in a vertical circle. His minimum velocity