hello there, i have a final tommorrw and i need to understand these question, pl

Question

hello there, i have a final tommorrw and i need to understand these question, please if you are going to tell me the answer without the explanation please do not answer. i want to know how to answer these question if it was not a multiple question, also i do not want to waste this question, so please if you know the answer and how to do it please help me.

7. A solid object extends from r a to z b along the r-axis. The cross-section of the solid perpendicular to the z-axis at a point r has area given by an integrable function. G(ar) What quantity does the integral Jo G(r)dr represent? (a) The work required to empty a tank of water shaped like the solid object (b) The force exerted on the cross-section through r a if the object is filled with water (c) The mass of the object (d) The volume of the object e) None of the above

Explanation / Answer

ans is D) The volume of the object

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