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A helix is generated by a point moving round a cylinder while advancing

  • A.along a plane perpendicular to the axis
  • B.uniformly along its axis
  • C.at a rate increasing with the angle turned
  • D.toward the axis at a uniform rate

Answer: B

One revolution advances the point along the axis by the pitch, and developing the cylinder turns the helix into a straight line. Screw threads, helical springs and spiral staircases are all applications of the same curve.

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