(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm involved in a dispute about conical pendulums, and my friend, for whatever reason, doesn't want to believe me until somebody backs me up. Assume t is the angle that the string makes with the horizontal.

2. Relevant equations

F=ma

3. The attempt at a solution

Tsint = mg

Tcost = mw^2*r = mw^2*Lcos(t)

T=mw^2*L, where L is the length of the string

Dividing gives:

sin t = g/(w^2*L)

This implies that if w^2*L is smaller than the acceleration of gravity, a conical pendulum cannot maintain a constant angle t with the horizontal.

P.S. this is actually not a homework question. I'm almost certain my calculations are right, but my friend insists that there's no minimum rotation speed for a conical pendulum.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Please help settle this dispute

**Physics Forums | Science Articles, Homework Help, Discussion**