Answer quickly
4. Two rods, ' A' and ' B',  of the same weight and equal length. have different thicknesses. A boy, while playing with them on a beach, held them vertically on the surface of sand as shown in the figure. Which one of them will sink less? Explain.


5. Three holes. A. B and C, are made in an empty can at different levels, one over the other, as shown in the figure. They are (temporarily) closed with an adhesive tape. The can is now filled with water. What will you observe, when the tape (on all of them) is pulled out? Justity your answer. 

Dear Student
4.
Pressure = Force/Area

As area of thin rod will be less than area of broad rod therefore it will apply more pressure on sand and hence will sink more.
So rod A will sink more and rob B will sink less.

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