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A simple pendulum of length 1 m is allowed to oscillate with amplitude 2°. It collides elastically with a wall inclined at l° to the vertical. Its time period will be: (use g = π2)

 

a
23sec
b
43sec
c
2 sec
d
none of these

detailed solution

Correct option is B

Time period for half part:T = 2πlg = 2πlg = 2ππ = 2 secSo 2° part will be covered in a time t = T2 = 1 secFor the left l° part:θ = θ0sin(ωt)1° = 2° sin(2πT×t) ⇒12= sin(2πT×t)⇒π6 = π×t   ⇒ t= 16secTotal time ⇒ T2+2t⇒1+2×16 = 1+13 = 43sec

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