posted by tim on .
A bob of mass = 0.250 is suspended from a fixed point with a massless string of length = 23.0 . You will investigate the motion in which the string traces a conical surface with half-angle = 25.0.
What tangential speed must the bob have so that it moves in a horizontal circle with the string making an angle 25.0 with the vertical?
Im setting it up right but keep getting the wrong answer
The radius of the circle comes from trig:
but centripetal acceleration must equal the force of gravity pushing the bob inward, so
solve for v.