P15 012

background image

12.

(a) The total weight is

W = ρghA =



1.00

× 10

3

kg/m

3

 

9.8 m/s

2



(200 m)



3000 m

2



= 6.06

× 10

9

N .

(b) The water pressure is

p = ρgh =



1.03

× 10

3

kg/m

3

 

9.8 m/s

2



(200 m)



1 atm

1.01

× 10

5

Pa



= 20 atm

which is too much for anybody to endure without special equipment.


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