gc textbook chapter 11 Vibrations and Waves (id: 4ebe4e856)

本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理

[填空题]
A 220-kg wooden raft floats on a lake. Whei- sx7e(r(w :obcel y.n a 75-kg man stax met:;3w.gf h zdeeh(k1(h+unds on the raft, it sinks 4.0 cm deeper into the water. When he steps off, the raft vibrat:e e1g tz3h;kmd+xe (wh f(uh.es for a while.
(a) What is the frequency of vibration?(round to one decimal place) $\approx$    Hz
(b) What is the total energy of vibration (ignoring damping)?(Round to the nearest intege) $\approx$    J

参考答案:
空格1: 1.5±2%  空格2: 15±2% 


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