Exam-Style Problems

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Nov 2013 p13 q11
1341

The diagram shows the curve \(y = \sqrt{x^4 + 4x + 4}\).

The region shaded in the diagram is rotated through 360° about the x-axis. Find the volume of revolution.

problem image 1341
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Nov 2013 p12 q9
1342

The diagram shows part of the curve \(y = \frac{8}{x} + 2x\) and three points \(A, B\) and \(C\) on the curve with \(x\)-coordinates 1, 2 and 5 respectively.

Find the volume obtained when the shaded region is rotated through 360° about the \(x\)-axis.

problem image 1342
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Nov 2022 p13 q10
1343

The diagram shows the circle \(x^2 + y^2 = 2\) and the straight line \(y = 2x - 1\) intersecting at the points \(A\) and \(B\). The point \(D\) on the \(x\)-axis is such that \(AD\) is perpendicular to the \(x\)-axis.

(a) Find the coordinates of \(A\).

(b) Find the volume of revolution when the shaded region is rotated through 360° about the \(x\)-axis. Give your answer in the form \(\frac{\pi}{a}(b\sqrt{c} - d)\), where \(a, b, c\) and \(d\) are integers.

(c) Find an exact expression for the perimeter of the shaded region.

problem image 1343
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June 2012 p12 q1
1344

The diagram shows the region enclosed by the curve \(y = \frac{6}{2x-3}\), the x-axis and the lines \(x = 2\) and \(x = 3\). Find, in terms of \(\pi\), the volume obtained when this region is rotated through 360° about the x-axis.

problem image 1344
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June 2012 p11 q11
1345

The diagram shows the line \(y = 1\) and part of the curve \(y = \frac{2}{\sqrt{x+1}}\).

(i) Show that the equation \(y = \frac{2}{\sqrt{x+1}}\) can be written in the form \(x = \frac{4}{y^2} - 1\). [1]

(ii) Find \(\int \left( \frac{4}{y^2} - 1 \right) \, dy\). Hence find the area of the shaded region. [5]

(iii) The shaded region is rotated through 360° about the \(y\)-axis. Find the exact value of the volume of revolution obtained. [5]

problem image 1345
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