一道英语物理题By how much does the water pressure exceed atmospheric air pressure:a.) 1 m below the surface of a pool (of fresh water)?by Pa b.) 7 m below the surface?by Pa ________________________________________c.) How far below the surface do you have to go,before the total pressure you feel is triple that of atmospheric pressure at sea level (itself about 100,000 Pa)*?m(*Hopefully from this,you'll gain an appreciation for just how much our normal atmosph
问题描述：
一道英语物理题
By how much does the water pressure exceed atmospheric air pressure:
a.) 1 m below the surface of a pool (of fresh water)?
by Pa
b.) 7 m below the surface?
by Pa
________________________________________
c.) How far below the surface do you have to go,before the total pressure you feel is triple that of atmospheric pressure at sea level (itself about 100,000 Pa)*?
m
(*Hopefully from this,you'll gain an appreciation for just how much our normal atmospheric pressure is -- and that us human beings really do live "on the bottom of an ocean of air.")
答
a)
p
= ρgh
= 1000*9.8*1
= 9.8*10^3 Pa
b)
p
= ρgh
= 1000*9.8*7
= 6.9*10^4 Pa
c)
p = ρgh
(3-1)*10^5 = 1000*9.8*h
h = 20.4 m