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  1. With what minimum acceleration can a fireman slide down a rope while breaking
  2. A 220 volts input is supplied to a transformer. The output circuit draws
  3. A black hole is an object whose gravitational field is so strong that even light
  4. An atom bomb weighing 1 kg explodes releasing 9×10¹³ J of energy.
  5. A Galilean telescope has an objective of focal length 100 cm and magnifying power 50