Answered: As part of a class demonstration, a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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As part of a class demonstration, a physics teacher sits down
on a rolling office chair while holding a fire extinguisher. The
total mass of the teacher+chair+extinguisher is M = 82.0 kg.
Starting from rest, she aims the fire extinguisher horizontally
and squeezes the handle. Over the course of a few seconds,
∆m = 4.00 kg of carbon dioxide is ejected from the extin-
guisher with a speed of v = 20.0 m/s relative to the ground.
What is the total kinetic energy KE contained in the system
(teacher+chair+extinguisher+ejected carbon dioxide) at the
end of the demonstration? (You may neglect any friction in
the wheels of the chair.) For the limit check, investigate what
happens to KE if the handle is only squeezed very briefly so
that barely any carbon dioxide escapes (∆m → 0).

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