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A pendulum with a length of \( 1 \mathrm{~m} \) is released from an initial angle of \( 15^{\circ} \). After \( 1000 \mathrm{~s} \), its amplitude
P has been reduced by friction to \( 5.5^{\circ} \). What is the

W value of \( \frac{b}{2 m} \) ? (Given, \( \ln 2.73=1 \) )
(1) \( 0.5 \times 10^{-3} \mathrm{~s}^{-1} \)
(2) \( 0.001 \mathrm{~s}^{-1} \)
(3) \( 0.002 \mathrm{~s}^{-1} \)
(4) \( 0.005 \mathrm{~s}^{-1} \)
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