The problem:(adsbygoogle = window.adsbygoogle || []).push({});

Figure 6-43 shows a "conical pendulum", in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.050 kg, the string has length L = 0.90 m and negligible mass, and the bob follows a circular path of circumference 0.94 m.

(a) What is the tension in the string?

(b) What is the period of the motion?

I found:

radius of the circle=circumference/2pi

angle that string makes with vertical=arcsin(r/l)

T_y=mg

T_x=F_centripetal=ma=mv^2/r

I would like very much to find v, but I don't see how using omega will be at all helpful. period=(2)(pi)(r)/v doesn't seem to get me anywhere, either.

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

Join Physics Forums Today!

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

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

# Homework Help: Tension in a conical pendulum's string

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