A simple pendulum is vibrating with an angular amplitude of π π /2. The value of a for which the resultant acceleration has a direction along the horizontal is
A
B
180 0
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Here a r = 
= 
= 2g cos α α
and tan α α = 
( Q a t = g sin α α )
= 
i.e., tan 2 α α = 2 or sec 2 α α = 3
or cos α α = 
or α α = cos -1 
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