Integration and applications of integration — Question 10
QCAA 2025, Paper 2 · 1 mark
Q10 · 2025 · Technology-activeSimple familiar1 mark
QUESTION 10
Consider the solid of revolution formed by rotating a section of the curve y=sin(x) around the x-axis. Determine the volume of the solid of revolution.

(A)0.79 units3 (B)0.86 units3 (C)2.47 units3 (D)2.60 units3 WORKED SOLUTION
Answer C
1 markANSWERC — 2.47 units3 Worked solution
Using the disk method from x=0 to x=π/2, V=π∫0π/2sin2xdx=π[2x−4sin(2x)]0π/2=4π2≈2.47 cubic units. Worked explanation by QCE Vault; correct option verified against the QCAA answer key.
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