A simple pendulum is oscillating with angular displacement `90^(@)` For what angle with vertical the acceleration of bob direction horizontal?

A simple pendulum is oscillating in a trolley moving on a horizontal straight road with constant acceleration a. If direction of motion of trolley is taken as positive x direction and vertical upward direction as positive y direction then the mean position of pendulum makes an angle

A simple pendulum is oscillating in a trolley moving on a horizontal straight road with constant acceleration a. If direction of motion of trolley is taken as positive x direction and vertical upward direction as positive y direction then the mean position of pendulum makes an angle

A simple pendulum is oscillating without damping. When the displacement of the bob is less then maximum, its acceleration vector vec(a) is correctly shown in :

A simple pendulum is oscillating without damiping, When the displacement of the bob is less than maximum, its acceleration vector veca is correctly show in: