試題詳解

57. Two spring-block systems are placed in a viscous environment independently. The viscous forces experienced by the blocks is approximately linearly proportional to the speed of blocks. Due to the damping effect, both spring-block systems exhibit underdamped oscillating bchavior. The shape of blocks of the two systems is the same, but the mass and spring constant of the 1^st and the 2^nd system are (1 kg, 1 Nim) and (1.2 kg, 0.9 N/m), respectively. Initially, both blocks are at rest and are released 5 cm away from their equilibrium positions. Which of the following statements is true?
(A) It takes a longer time for the block in the 2^nd system to finally come to rest.
(B) It is not possible for these two systems to both exhibit underdamped behavior.
(C) Both blocks move towards the equilibrium position and then stop at the equilibrium position.
(D) In the very beginning, the oscillation frequency is larger for the 1^st system.
(E) In the very beginning, the oscillation frequency is larger for the 2^nd system.