# Homework Help: Centripetal Force

1. Nov 24, 2005

### kingyof2thejring

Question 1
A conical pendulum consists of a string of length 1.2 m and a bob of mass 0.41 kg. The string makes an angle of 21° with the vertical. Calculate the tension in the string, in N.
iam not sure wat to do here if
$$l\omega{}^2 = \frac{g}{\cos\phi}$$
then i use
$$T=ml\omega{}^2$$ to get the force. is that the way to calculate the tension. Thanks in advance

Last edited: Nov 24, 2005
2. Nov 24, 2005

### rocketboy

First draw a diagram. I think you will see the answer when you do that.

(what would the tension be if it were straight down?)

3. Nov 24, 2005

Tcos 0 = mg
T=4.30