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Exam-Style Questions on Volume of RevolutionProblems on Volume of Revolution adapted from questions set in previous Mathematics exams. |
1. | IB Analysis and Approaches |
A function \(f\) is defined as \(f(x) = \arcsin(x — 5)+\frac{\pi}{2}\), where \(4 \le x \le 6 \).
The region bounded by the curve, the y-axis, the x-axis and the line \(y = \pi \) is rotated fully about the y-axis to form a solid of revolution.
Find the volume of the solid.
2. | IB Analysis and Approaches |
The function \( f \) is defined by \( f(y) = \sqrt{y^2 + 10y} \) for \( 0 \leq y \leq 8 \).
The region enclosed by the graph of \( x = f(y) \) and the \( y \)-axis is rotated by \( 360^\circ \) about the \( y \)-axis to form a solid weight. The weight is drilled through from the top along the \( y \)-axis, creating a cylindrical hole 6 units deep. The volume of the remaining weight is 1000 cubic units.
Find the radius of the cylindrical hole that was drilled through the weight.
3. | IB Analysis and Approaches |
The function \( f \) is defined as \( f(x) = \sqrt{x \cos(x^2)} \), where \( 0 \leq x \leq \sqrt{\frac{\pi}{2}} \).
Consider the region \( R \) enclosed by the graph of \( f \) and the x-axis.
The region \( R \) is rotated by \( 2\pi \) radians about the x-axis to form a solid.
Find the exact volume of the solid formed.
4. | IB Analysis and Approaches |
Consider the function \(f(x) = \sec^{-1}(x) \text{ where } 1 \le x \le \frac{\pi}{2} \)
(a) Sketch the curve \(y=f(x)\) clearly indicating the coordinates of the endpoints.
(b) State the domain and range of \( f(x) \).
The curve \(y=f(x) \) is rotated \(2\pi\) about the y-axis to form a solid of revolution that is used to model a flower vase.
(c) Find an expression for the volume, \(Vm^2\), of water in the vase when it is filled to a height of \(h\) metres.
(d) Hence determine the maximum volume of the vase.
At \(t = 0\) the vase is empty. Water is then added to the vase at a constant rate of \(0.1m^3s^{-1} \)
(e) Find the time it takes to fill the vase to Its maximum volume.
(f) Find the rate of change of the height of the water when the vase is filled to half its maximum height.
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