2. A hard disk of model A rotates 5400 times per minute. The manufacturer provides a 3-year warranty, and guarantees that model A hard disk can continuously run for 3 years ( 365 days a year and 24 hours a day) without failure.
(a) How many times does the hard disk continuously rotate in 3 years? (express your answer in scientific notation)
(b) Assume that a hard disk of model A would be out of order after running for the number of times found in (a). If a hard disk of model A runs 260 days a year and 10 hours a day, do you think it can run for 8 years? Explain your answer.
更新1:
re. hk56740 Sorry! Your answer is wrong. You must multiply 5400, not divided by 5400. (3x365x24x60x5400)<- correct Therefore, the ans is (8.51x10^9)
