reduced pendulum length [地物] 折合摆长
equivalent pendulum length 等值摆长
pendellnge effective pendulum length 摆动长度
equivalent length of pendulum 等效摆长
length of equivalent pendulum 等摆长度
So if you look at the rod-- and we use the pendulum as our standard, l-- with length little l-- then you see the period will be the same if 1 1/2 R is little l...
所以如果你看杆子-,我们用摆作为标准，长度为-,你会发现如果,1，1/2，R等于l，周期相同。
would have obtained from a pendulum if the l/2 length of the pendulum were l...
,应该从摆中得到,如果摆的长度是l…
L the length of the pendulum is l, the length of the string.
摆锤的长度是，绳子的长度。
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