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1.9 Calculus

1.9 Calculus

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Question 322

The path of a high-precision laser cutter across a titanium plate is defined by the parametric equations

x=t2+8t,y=12t(8−t),a≤t≤b x = t^2 + 8t, \quad y = \frac{12}{t(8-t)}, \quad a \le t \le b x=t2+8t,y=t(8−t)12​,a≤t≤b

where ttt is the time in seconds, and aaa and bbb are constants. The cutter's path intersects the reference line y=1y = 1y=1 at two points representing the start and end of a specific cooling phase.

a.

Find the value of aaa and the value of bbb, where b>ab > ab>a.

[2]
b.

The region RRR is bounded by the path and the line y=1y = 1y=1. Show that the area of region RRR is given by

M−k∫abt+4t(8−t) dt M - k \int_{a}^{b} \frac{t+4}{t(8-t)} \, dt M−k∫ab​t(8−t)t+4​dt

where MMM and kkk are constants to be found.

[4]
ci.

Express t+4t(8−t)\frac{t+4}{t(8-t)}t(8−t)t+4​ in partial fractions.

[3]
cii.

Hence, use algebraic integration to find the exact area of RRR, giving your answer in the form P−Qln⁡3P - Q \ln 3P−Qln3, where PPP and QQQ are integers.

[4]
Markscheme

1.9 Calculus Questions

  1. A Level
  2. /Maths
  3. /1.9 Calculus

825 exam-style questions on OCR (MEI) A Level Maths 1.9 Calculus, covering 1.9.1 Gradient of a curve at a point, 1.9.2 Gradient as limit of chord gradient, 1.9.3 Derivative as gradient of tangent, 1.9.4 Sketch the gradient function, 1.9.5 Differentiate y = kx^n, 1.9.6 Second derivative as rate of change of gradient, 1.9.7 Stationary points: maxima and minima, 1.9.8 Increasing and decreasing functions, 1.9.9 Tangent and normal at a point, 1.9.10 Differentiate e^kx, a^kx and ln x (A-level only), 1.9.11 Differentiate trigonometric functions (A-level only), 1.9.12 Product rule (A-level only), 1.9.13 Quotient rule (A-level only), 1.9.14 Chain rule (A-level only), 1.9.15 Rates of change with the chain rule (A-level only), 1.9.16 Implicit differentiation (A-level only), 1.9.17 Concavity and the second derivative (A-level only), 1.9.18 Points of inflection (A-level only), 1.9.19 Integration as reverse of differentiation, 1.9.20 Integrate kx^n, 1.9.21 Constant of integration, 1.9.22 Indefinite and definite integrals, 1.9.23 Area between a graph and the x-axis, 1.9.24 Integrate e^kx, 1/x, sin kx, cos kx (A-level only), 1.9.25 Integration as the limit of a sum (A-level only), 1.9.26 Area between two curves (A-level only), 1.9.27 Integration by substitution (reverse chain rule) (A-level only), 1.9.28 Integration by substitution (other cases) (A-level only), 1.9.29 Integration by parts (A-level only), 1.9.30 Integration using partial fractions (A-level only), 1.9.31 Formulate first order differential equations (A-level only), 1.9.32 Solve first order differential equations (A-level only), and 1.9.33 Interpret solutions of differential equations (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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