A 100g pendulum bob hangs from a 1 meter string. What is the tension in the string when the pendulum is not moving (i.e. at the 'bottom')? What is the tension when it is at 30° to the vertical?
The Attempt at a Solution
Tension when not moving:
Tension at 30° to the vertical:
Is that correct?
My main dilemma is that my professor told us when a pendulum exceeds a 15° swing angle, that it can no longer be considered a simple pendulum and goes by more complicated physics, however, this pendulum swings to twice that angle.
Also, when I put this on a different site, someone answered and said "The tension at any angle cannot be known unless you also know its velocity at that point."