code: def rate_of_turn(speed, bank):
      '''return expected rate of turn in degrees/s for given speed in m/s and
         bank angle in degrees'''
      if abs(speed) < 2 or abs(bank) > 80:
          return 0
      ret = degrees(9.81*tan(radians(bank))/speed)
      return ref rate_of_turn(speed, bank):
      '''return expected rate of turn in degrees/s for given speed in m/s and
         bank angle in degrees'''
      if abs(speed) < 2 or abs(bank) > 80:
          return 0
      ret = degrees(9.81*tan(radians(bank))/speed)
      return ret
docs: return expected rate of turn in degrees/s for given speed in m/s and
         bank angle in degrees