問題詳情

2. A small ball of mass m is suspended in an elevator by a string of length L. Thestring does not stretch and its mass can be ignored. If the elevator locatedat the surface of the Earth and moves upward with an acceleration a, whatis the frequency of the ball's oscillatory motion?
(A) m(g - a)/(2πL),
(B)m(g +a)/(2πL),
(C)


(D)


(E)

Hereg is the gravitational acceleration on Earth's surface.

參考答案

答案：E
難度：計算中-1
書單：沒有書單，新增

用户評論

【鯊想上岸】評論

F=kx=m(g+a)T=2π√(m/k)k=m(g+a)/X=m(g+a)/LT=2π√(m/m(g+a)/Lf=1/T=1/2π√(g+a)/L