how to go after this question????

An effervescent tablet is dropped in water. Determine its size as a function of time.

source:ORTVAY RUDOLF
PROBLEM SOLVING COMPETITION IN PHYSICS
1997

5 Answers

24
eureka123 ·

sorry posted in wrong secction...but plz tell me how to start this...

1
Anuj ·

i m not quite sure of this, but this may be related to rate of change of Surface area...also, since s.a. goes on decreasing with time, the rate of dissapearance will keep on decreasing

is this of ny help?

9
Celestine preetham ·

actually official solution doesnt exist

i think its like dr/dt = K

use
dV/dt = C .r2 as change in volume is prop to surface area

24
eureka123 ·

yeah cele i know that official soln dont exist for this competition and they would never be available in future toooooo.........

but i cant understand ur statement.. dr/dt = K [7][7]

9
Celestine preetham ·

dV/dt =Cr2

V= kr3

dV/dt = kr2dr/dt= Cr2

so dr/dt = k

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