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The expected life of a ball bearing subjected to a load of 9800 N and working at 1000 rpm is 3000 hours. What is the expected life of the same bearing for a similar load of 4900 N and speed of 2000 rpm?
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- Unchanged
- 12000 hours
- 1500 hours
- 6000 hours
- Unchanged
Correct Option: B
L (P)3 = constant
| = |  |  | 3 | |||
| L2 | P1 |
| ⇒ | = | | | 3 | ||
| 2000 × 60 × t2 | 9800 |
t2 = 12000 hours
