Homework Help Forum: calculus (related rates)

Posted by drew on Tuesday, October 27, 2009 at 9:05pm.

A particle moves in the plane along the curve y=xln(x). At what rate is the distance from the origin increasing at the moment its x-coordinate is 2 cm and its x-coordinate is increasing at a rate of 17 cm/sec?

• calculus (related rates) - bobpursley, Tuesday, October 27, 2009 at 9:40pm

  distance=sqrt(y^2 + x^2) ddistance/dt= 1/2distance *( 2ydy/dt+2xdx/dt) now examine y dy/dt= x ln(x) (ln(x)+1) dx/dt ddistance/dt=rateyou want=1/2distance*(2xlnx+1)17cm/sec + x dx/dt) check that, I typed it in a hurry.

  
  

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