Find the depth at which an air bubble of radius 0.0003 m will remain in equilibrium in water given surface tension of water
=7* 10-2 N/m, g= 9.8m/s-²

h = 0.047 m

Explanation:

It is given that,

Radius of an air bubble is 0.0003 m

The surface tension of water is

We need to find the the depth at which an air bubble of radius 0.0003 m will  remain in equilibrium in water. Let it is given by h.

The excess pressure inside air bubble Is given by the formula as follows :

.....(1)

T is surface tension

Also, pressure due to a height is given by :

So, equation (1) becomes :

So,

So, the depth is 0.047 m.

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when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min