IIT JEE , AIEEE Forum - Physics , Mechanics

aankurverma

oh srry i read it wrong r u answering d angle which it makes wid d horizontal ?????

as if d angle mentioned here is d angle which it makes wid d meniscus

cutepooja

ya thats what i am sayin

aankurverma

oh ok

well if it so den it can't b normal

by angle of rotation does it mean rotating n making angle

if it so den it can b true as if while rotating a bottle d angle can acute or varying frm 0 to 180 but not 90 or normal as if in dat position water can't come down

n same reasons for d angle option

cutepooja

ya rotating along wid making an angle wid horizontal

pls tell are u sayin answr is 0 to 180 but not 90
(why at 90 water cant come down the bottle whole we are rotating it)
water will come at 90 but less than x where x is frm 0 to 90
i wanna know the angle dependance (exactly)

cutepooja

FORUM EXPERTS PLEASE REPLY DO I HAVE TO BEG U FOR AN ANSWER PLS YAR HELP I DUN THINK IT IS EASY TO BE NEGLECTED

pebbati_abhimanyu

the angle cant b measured accurately but thk practically...........u put the bottle at 0 and slowly n steadily chg the angle.........at certain angle betweeen 0 n 90, the water flo is max.......the angle depends upon the size of the orifice.....

astatine19

Allright, here's atentative answer for the first qn:

Im taking some assumptions, that radius of first bubble is r, thickness of the bubble film is negligible, surface tension of soap is T, and that the inner surface of the outer bubble is almost touching the outer surface of the inner bubble.

We have, pressure in the first bubble as

where P₀is the atmospheric pressure

This will be the outside pressure for the 2nd bubble. So, pressure inside the 2nd bubble will be

So for the n^th bubble,

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