Answer :

(a) The pressure at the bottom of the container (P) is sum of the pressure due to water and the atmospheric pressure.


Here, the density of water,



Now, Force on the bottom of the container , .


Given,


Hence, (ANS)


(b) The net horizontal forces cancel out as the pressure is same at all points lying in the same horizontal plane. The vertical forces (F’) includes the weight of the water and the force due to atmospheric pressure.



We have 0.5 l of water. So the weight will be 0.5 kg.



Thus the Total force is 205 N while the total downward force on the glass is 204 N {from (a)}.


Therefore, the total upward force,


Hence, the total upward force is 1 N.


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