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A friction pendulum bearing provides a restoring force through

  • A.a lead core that yields under displacement
  • B.a spring connecting the bearing to the foundation
  • C.the curvature of the sliding surface it moves on
  • D.the elasticity of a rubber layer within the bearing

Answer: C

Because the slider rides up a concave surface, gravity pulls it back towards the centre, and the radius of that surface fixes the isolated period. Friction between the slider and the surface provides the damping at the same time.

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