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The life of the bearing, in hours, when the load is doubled to 2F is

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A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is is                     

      (a) 8000                                                              (b) 6000

      (c) 4000                                                              (d) 1000

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