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Yes. vs > v0 and you're behind the source means you're catching up to it. Only the relative motion matters for the Doppler effect. Even though you're behind the source and it's moving away from you in absolute terms, you're moving toward it in relative terms.
There is only one rifle described in the question and it travels 0 m. nice try. The whole question is shown below: An observer stands 26 m behind a marksman practicing at a rifle range. The marksman fires the rifle horizontally, the speed of the bullets is 790 m/s, and the air temperature is 20°C. How far does each bullet travel before the observer hears the report of the rifle? Assume that the bullets encounter no obstacles during this interval, and ignore both air resistance and the vertical component of the bullets' motion.
motivation behind the invention
i need to know the science behind hair straighteners.
what is the science behind this resource/type of energy
The frequencies are the same, unless the source is moving relative to the observer.
Yes that is the case.
being towed behind a PWC with an operator and an observer on board
Pennsylvania is 5 hours behind Greenwich.
an observer or a wide-angle rearview mirror
Which of the following BEST describes the concept behind Web 2.0? Download Write Read-write Upload
Ice land is behind pennsylvnia in time, and all the hot girls go to pennsylvania. And there are topless beaches and lots of strip clubs.
The apparent frequency does not depend on who is in front.
I say Pennsylvania because their really behind
Yes, right behind Delaware.