what would the perfect watch measure for this time interval? what is the uncertainty?

running watches interval timing image

Bri

Assume that an inexpensive watch runs 0.005% slower than a "perfect watch" (viz., a "time standard") that neither loses nor gains time. That inexpensive watch measures a time interval as Delta t = 5 days 8 hours 11 minutes 29 seconds ± 0.9 seconds, where the quoted uncertainty in time comes from the measurement procedure, not from the watch itself. Assuming that the same measurement procedure is used, what would the perfect watch measure for this time interval? Give the answer in seconds to the nearest 0.1 s. Also give the uncertainty in seconds to the nearest 0.1 second.

please show the steps on how to arrive at the correct answer,thanks!

Answer
Delta t = 5 days 8 hours 11 minutes and 29 seconds and this is the time on the Perfect watch.
Loss of time on an inexpensive watch of error 0.005% is delta time x percent error. Convert the delta time into seconds and multiply by the percent error.
Uncertainty is 0.9s. To find uncertainty multiply delta time in seconds with 0.9 seconds and find its value. Round to nearest 0.1 second.

You must do the working your own self.

What cameras have an interval shooting mode?

water_skip

What cameras have an interval shooting mode? I want a compact digital camera that will take a picture once in a while (like once a minute or something). That way I can leave it running all night and watch the stars go buy or something. Is there a name for this feature, besides time interval mode?

Answer
It's called time lapse photography.

Very few still cameras have this feature, although many top-end and even top consumer video cameras have a mode for it.

You'll likely need an aftermarket timer/shutter release if you want to automate this.

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