Pen P of the flatbed plotter traces the curve - Path Coordinates

  • #1

Homework Statement


This is Pytels Dynamics 2nd edition problem 13.16

13.16. Pen P of the flatbed plotter traces the curve y=x3/80000, where x and y are
measured in mm. When x=200mm, the speed of slider A is 60 mm/s. For this position, calculate
(a) the speed of P; and (b) the normal component of the acceleration of P

Fig P13_16.jpg

Homework Equations




The Attempt at a Solution



Pytels_Dynamics 13_16.jpg


In part (a) I don't get 108.2 mm/s for the speed. what am I doing wrong?
 

Answers and Replies

  • #2
TSny
Homework Helper
Gold Member
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##\dot y## is the derivative of ##y## with respect to time. You took the derivative of ##y## with respect to ##x##. Hint: chain rule.
 
  • #3
I guess this is correct. Right?

Pytels_Dynamics063.jpg
 
  • #4
TSny
Homework Helper
Gold Member
12,955
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That look's correct. Nice work.
 

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