An ultrasonic level sensor for liquid ga
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K.P. Selig; H.G. Wener
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Article
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1981
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Elsevier Science
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English
β 158 KB
have a component perpendicular to the surface. According to the laws of friction, this would allow a frictional force parallel to the surface which would increase the reaction further. For a sufficiently large angle between AC and the surface, and sufficiently large coefficient of friction, the bull