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A wheel having moment of inertia \( 4 \mathrm{~kg} \mathrm{~m}^{2} \) about its symmetrical axis, rotates at rate of
\( \mathrm{P} \) \( 240 \mathrm{rpm} \) about it. The torque which can stop the rotation of the wheel in one minute is
(1) \( \frac{5 \pi}{7} \mathrm{Nm} \)
(2) \( \frac{8 \pi}{15} \mathrm{Nm} \)
(3) \( \frac{2 \pi}{9} \mathrm{Nm} \)
(4) \( \frac{3 \pi}{7} \mathrm{Nm} \)
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