Determine the maximum tension in the pendulum rod

[nesan]

Homework Statement

A clock’s pendulum is 60 cm long with a bob at the end of mass 500 g. Determine the maximum tension in the pendulum rod when the bob is

b) swinging at a speed of 2.4 m/s

Homework Equations

v^2 / r = ac

The Attempt at a Solution

9.8m/s^2 = g

(2.4)^2 / 0.6 = 9.6m/s^2

9.8 * 0.5 = 4.9N

9.6 * 0.5 = 4.8N

Fnet = 4.9 - 4.8 = 0.1 N

What am I doing wrong? ._.

Thank you.

Okay guys I looked t it from another perspective and ended up wit the right answer.

I added the force of gravity and the tension going up.

But here's a small question. Why do we have to add them? Are they not cancelling each other out? Or is it because the pendulum is balanced ? o.o

So we add both tensions?

 

[tiny-tim]

hi nesan!

So we add both tensions?

i'm very worried by your last question …

what did you think the two tensions were? ​

(the acceleration is upward

F_total = ma, so T - mg = ma, ie T = ma + mg)

 

[nesan]

hi nesan!


i'm very worried by your last question …

what did you think the two tensions were? ​

(the acceleration is upward

F_total = ma, so T - mg = ma, ie T = ma + mg)

Yup, I got that last night while in bed thinking. Haha xD

Thank you. :)<3