Science:Math Exam Resources/Courses/MATH103/April 2016/Question 05 (b)
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Question 05 (b) 

The solid of part (i) is filled with liquid of varying density. It is given that liquid density units from the bottom of the solid is grams per cubic unit. Find the mass of the liquid inside the solid. 
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? 
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

Denoting the solid by for a given density function we have the mass formula 
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Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. The density function of the liquid is given in the question as By the hint, the mass of the solid is
In the case of our solid, the crosssections at height are circles with radii , so that Therefore (for ).
Hence the mass of the liquid inside the solid is 
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