問題詳情

12.A block with mass m 5ec0c7f843f71.jpg 250g is fastened to a spring with spring constant k 5ec0c8373836a.jpg 85N/m. The system is excited tooscillate. Assume that there is a velocity-dependent damping force Fd 5ec0c845dd8f4.jpg -bv in the system with b 5ec0c85a072f0.jpg 70g/s.How long does it take for the amplitude of the damped oscillation to drop to half its initial value? (ln2 5ec0c868c1535.jpg0.693)
(A)3s
(B)4s
(C)5s
(D)6s
(E)7s



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