Jorge wishes to observe the progress of his vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that sound waves do not travel in a vacuum. So, Jorge places a mercury barometer inside the bell jar and follows the height of the mercury column as the pump chugs away. The density of mercury is 1.36 × 104 kg/m³ and the standard atmospheric pressure is 1.01 × 105 Pa. The acceleration g due to gravity is 9.81 m/s². When he observes a height of 7.89 mm of mercury, what fraction of atmospheric pressure, expressed as a percentage P, has Jorge achieved in his bell jar? P = %

Jorge wishes to observe the progress of his vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that sound waves do not travel in a vacuum. So, Jorge places a mercury barometer inside the bell jar and follows the height of the mercury column as the pump chugs away. The density of mercury is 1.36 × 104 kg/m³ and the standard atmospheric pressure is 1.01 × 105 Pa. The acceleration g due to gravity is 9.81 m/s². When he observes a height of 7.89 mm of mercury, what fraction of atmospheric pressure, expressed as a percentage P, has Jorge achieved in his bell jar? P = %

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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Concept explainers

Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.

Question

0 Jorge wishes to observe the progress of his vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that
sound waves do not travel in a vacuum. So, Jorge places a mercury barometer inside the bell jar and follows the height of the
mercury column as the pump chugs away.
The density of mercury is 1.36 × 104 kg/m³ and the standard atmospheric pressure is 1.01 × 105 Pa. The acceleration g due to
gravity is 9.81 m/s².
When he observes a height of 7.89 mm of mercury, what
fraction of atmospheric pressure, expressed as a percentage
P, has Jorge achieved in his bell jar?
P =
%

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