What will happen to two soap bubbles of different radii, which are in contact with each other? Why?

What will happen to the volume of a bubble of air found under water in a lake where the temperature is 15°C and the pressure is 1.5 atm, if the bubble then rises to the surface where the temperature is 25^(@)C and pressure is 1 atm

Friction is the force which opposes the relative motion between two surfaces in contact with each other. What is a limiting static friction?State the laws related to this.

Air is blown in between two pith balls suspended freely. a)What will happen to the balls? (i)They repel each other. (ii)They attract each other. (iii)They start oscillating. (iv)They remain in their initial position. (v)They fall on the ground. b)Give your explanation.

Which pair is different from the others?