July 2014

Problem 05 | Elimination of Arbitrary Constants

Problem 5
Eliminate A and B from x = A sin (ωt + B). ω being a parameter not to be eliminated.
 

Problem 06 | Elimination of Arbitrary Constants

Problem 6
Eliminate the c1 and c2 from x = c1 cos ωt + c2 sin ωt. ω being a parameter not to be eliminated.
 

Partial Derivatives

Let F be a function of several variables, say x, y, and z. In symbols,

$F = f(x, \, y, \, z)$.

The partial derivative of F with respect to x is denoted by

$\dfrac{\partial F}{\partial x}$

and can be found by differentiating f(x, y, z) in terms of x and treating the variables y and z as constants.
 

01 Maximum area of triangle of given perimeter

Problem 1
Show that the largest triangle of given perimeter is equilateral.
 

004-triangle-geven-perimeter.gif

 

821 Rectangle minus semi-circle | Moment of Inertia

Problem 821
Find the moment of inertia about the indicated x-axis for the shaded area shown in Fig. P-821.
 

821-rectangle-minus-semi-circle.gif

 

Cycloid: equation, length of arc, area

Problem
A circle of radius r rolls along a horizontal line without skidding.

  1. Find the equation traced by a point on the circumference of the circle.
  2. Determine the length of one arc of the curve.
  3. Calculate the area bounded by one arc of the curve and the horizontal line.
cycloid_small_02.gif