※ 引述《johnchen0882 (ada)》之銘言：
: 96th:
: 10. a light source emits a light wave with frequency f to an observer.
: at the same time ,the observer moves toward the light source with
: speed of light . what is the frequency observed by the observer?
: A. B. C. D. E.
: 1/根號3倍 1/2倍 1倍 根號2倍 根號3倍
: 請問這會符合都普勒定律嗎? 如果是,好像選不到答案耶!
: 95th:
: a 50 g object is attached to a horizontal spring with a spring constant of
: 10 N/m and released from rest with an amplitude of 25cm . what is the speed
: of the object when it is halfway to the equilibrium position if the surface
: is fricitonless?
: A
: 4.21m/s
: B
: 8.42m/s
: C
: 3.06m/s
: D
: 9.68m/s
T=2π√(M/K)
v = 2πR/T * Sin(arccos((R/2)/R)) = 3.061862178
答案 C
: 謝謝各位~
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