# Random Questions from 2016 Prelims #7

VJC P1 Q9

(i) Sketch the graph with equation , where and

A hemispherical bowl of fixed radius cm is filled with water. Water drains out from a hole at the bottom of the bowl at a constant rate. When the depth of water if cm (where ).

(ii) Use your graph in (i) to show that the volume of water in the bowl is given by .

(iii) Find the rate of decrease of the depth of water in the bowl, given that a full bowl of water would become empty in 24 s,

(iv) without any differentiation, determine the slowest rate at which the depth of water is decreasing.

Showing 4 comments
• Charles

Hi may I know the mark allocation for the sub-parts of this question? Is it possible to include the mark allocation for future questions too?

• KS Teng

will try, cos i gave out 2016 prelims to my students and most of these solutions are meant for their independent checking.

• Charles

Can I also confirm that “y le r” refers to “y is a real number”?

• KS Teng

its a typo

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