10. A pendulum is released from rest at point A, swings through point B over to point C, and then back to point A... then repeats as shown in the figure. At which point(s) is the tangential acceleration & restoring force zero?
A) A
B) B
C) C
D) A & B
E) A & C
F) B & C
G) Somewhere between A & B
H) Somewhere between B & C
11. A pendulum is released from rest at point A, swings through point B, over to point C, and then back to point A... then repeats as shown in the figure. You start your stopwatch when the pendulum is released at point A. When should you press "stop" to get the time measurement for one period, T?
A) As soon as the pendulum passes through point B
B) When the pendulum reaches the other side at point C
C) When the pendulum swings through point B on its way back after reaching C
D) When the pendulum swings over & all the way back to point A