PHYS 101 Lecture Notes - Lecture 31: Threshold Of Pain, Decibel, Statics

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PHYS 101: Physics for the Life Sciences Lecture 31:
Intensity and Fluid Mechanics and Statics
Intensity:
I=Pavg
A
P=¿
Power
A=¿
Area
[]=W/m2
The minimum intensity that can be registered by the human ear is
1 012 W/m2.
The pain threshold is
1W /m2.
Since this range is so large we usually use the decibel scale(dB).
β=10log(I
I0
)
The minimum intensity then is 0 dB
The pain threshold is 120 dB.
Fluid Mechanics and Statics:
Fluid - “anything that can flow”
e.g. gasses and liquids
Mass Density -
ρ=m
V
mass
V=¿
volume
Volume is often quoted in litres
1L=1 03c m3=1 03m3
ρwater =1 03kg m3
Pressure -
P=
F
A
F
=¿
magnitude of force
A=¿
area over which force is applied
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