4. A thin stick with length d and mass m is rotated continuously at a rate of one revolution per minute about the axis through the point at 0.1d from one end. Which statement is correct?
(A) The angular momentum is $73\pi md^{2}/9000 kg\cdot m^{2}/s$.
(B) The angular momentum is 0.
(C) The torque is $\pi md^{2}/30 N\cdot m$.
(D) The torque is $2\pi md^{2} N\cdot m$.
(E) None

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#7555145
這題在考什麼觀念 轉動慣量(包含以質心...
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