1.

What should be the height 'h' to which a cylinderical vessel be filled by an isotropic liquid so that the force on its sides is equal to the force acting on its botom ? (r = radius) :

Answer»

h=r
`h=r^(2)`
`h=2r`
`h=r//2`

Solution :Average PRESSURE on side`=(hdg)/2`,AREA or side `=2pirh`.Force on side=`(hdg)/2xx2pirh=pirh^(2)dg,` Force on BOTTOM= hdg `xxpir^(2)thereforepirh^(2)dg=pir^(2)hdg` or `r=h`
Correct CHOICE is (a).


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