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-Mike
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Yes, there are manufacturers that produce stopwatch models that display seconds only. These types of stopwatches are commonly used in sports and timing applications where precise second accuracy is required. Examples of manufacturers that produce seconds only stopwatches include ACCUSPLIT, Ultrak, and Seiko.
9.84 seconds is seconds only. It means 9840 milli seconds.
If you know the distance you've run, you can calculate your average speed by dividing the distance by the time it took.
A year only as about 30 million seconds.
Mathematically, frequency = (1/Period) Conceptually, the period is how long it takes a wave to begin repeating itself. For example, if I start a stopwatch when the wave reaches its peak, and then stop timing when it reaches its next peak, the time on the stopwatch is the period. The frequency is how far the wave gets in 1 second. Some examples: If it take a wave 30 seconds to go through one cycle, the period is 30 seconds. In 1 second, it gets only 1/30 of the way through its cycle. Its frequency is 1/30 then. If a wave repeats itself 10 times in 1 second, its frequency is 10. It's period must be 1/10 of a second.
There are only 31,536,000 seconds in a year. So, light can only travel for 31,536,000 in a year.