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Differentiation

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Question 107

The trajectory of a specialized particle in a particle accelerator is modeled by the curve C C\,C with equation

x=ye−4y,y∈R x = y e^{-4y}, \quad y \in \mathbb{R} x=ye−4y,y∈R
a.

Show that, for points on C C\,C with y≠0,14\displaystyle y\ne 0,\frac14y=0,41​,

dydx=yx(1−4y) \frac{\mathrm{d} y}{\mathrm{d} x} = \frac{y}{x(1 - 4y)} dxdy​=x(1−4y)y​

and state separately the value of dydx\displaystyle \frac{\mathrm{d}y}{\mathrm{d}x}dxdy​ at the origin (0,0)(0,0)(0,0).

[3]
b.

Given that a vertical detector strip at x=kx = kx=k, where k k\,k is a constant, detects the particle at exactly two distinct locations on the curve CCC,

find the range of possible values for kkk.

[4]
Markscheme

Differentiation Questions

  1. A Level
  2. /Maths
  3. /Differentiation

717 exam-style questions on Edexcel A Level Maths Differentiation, covering 9.1 Differentiating sin x and cos x, 9.2 Differentiating exponentials and logarithms, 9.3 The Chain Rule, 9.4 The Product Rule, 9.5 The Quotient Rule, 9.6 Differentiating Trigonometric Functions, 9.7 Parametric Differentiation, 9.8 Implicit Differentiation, 9.9 Using Second Derivatives, and 9.10 Rates of Change. Each one has a worked solution and a mark scheme showing where the marks go.

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