STEM Lessons for College Students

16.42 .. Adjusting Airplane Motors. The motors that drive airplane propellers are in some cases tuned by using beats. The whirring motor produces a sound wave having the same frequency as the propeller. (a) If one single-bladed propeller is turning at 575 rpm and you hear 2.0-Hz beats when you run the second propeller what are the two possible frequencies (in rpm) of the second propeller? (b) Suppose you increase the speed of the second propeller slightly and find that the beat frequency changes to 2.1 Hz. In part (a) which of the two answers was the correct one for the frequency of the second single-bladed propeller? How do you know?

University Physics with Modern Physics lessons by JJtheTutor. Designed to teach students problem solving skills.

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Question source: “University Physics with Modern Physics by Hugh Young and Roger Freedman

University Physics with Modern Physics lessons by JJtheTutor. Designed to teach students problem solving skills, test taking skills and how to understand the concepts.

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