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  4. A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector a is correctly shown in

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Q. A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector a is correctly shown in

IIT JEEIIT JEE 2002Work, Energy and Power

Solution:

Net acceleration a of the bob in position $B$ has two components.
image
(a) $a _{n}=$ radial acceleration (towards $B A$ )
(b) $a _{t}=$ tangential acceleration (perpendicular to $B A$ )
Therefore, direction of $a$ is correctly shown in option (c).