Question

A system of forces is such that every tangent to the curve given by x=a cos(theta),y=b sin (theta) ,z=b(theta)is a null line.Find the central axis and show that the pitch of the equivalent wrench is (a^2)/b.

Answer 1

what is this wrench?

Answer 2

@hero

Answer 3

someone please help...

Answer 4

have u studied nulll lines and null planes in mechanics?

Answer 5

no ... mechanics was my minor.

Answer 6

if you can give links probably I might learn something.

Answer 7

@experimentX http://en.wikipedia.org/wiki/Screw_theory