A critical component for a mechanical system will be subjected to a 0.01 Hz cyclical stress during operation (0.01 cycles per second). The stress will fluctuate between a tensile load of 150 MPa and a compressive load of -250 MPa. The design calls for a survival confidence limit of 10% (i. e. 10% failure rate acceptable). Approximately how long, in days, can the component be used before it must be replaced during maintenance

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Because they're in different places for this the temperature varies.