PHYS 101 Lecture Notes - Lecture 31: Threshold Of Pain, Decibel, Statics
4 Aug 2015
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Document Summary
Phys 101: physics for the life sciences lecture 31: The minimum intensity that can be registered by the human ear is. The pain threshold is 1w /m2 . Since this range is so large we usually use the decibel scale(db). The minimum intensity then is 0 db. For the most part we will be studying viscous free fluids. All forces in these fluids a normal to the surface and there are no shear forces acting on these fluids. The deeper you are submerged in a fluid, the greater the pressure that is acting on you. Consider the fluid inside the imaginary cylinder and study the forces on it. Forces in the y-direction t= top b= bottom. Therefore: m= v and v = a d. (pt a ) ( a d g)+(pb a)=0 (pt a )+( a d g)=(p b a) Therefore, the pressure increases as you increase depth at which you are submerged.
