12. One rope with weight 2.0 kg and length 10.0 m is tied on a shelf and stretched taut by a 98 kg box at the bottom. What is the speed v of a transverse wave on the rope? (Gravitational acceleration g = 10 m/s2 )
(A) 10.0 m/s
(B) 10.7 m/s
(C) 70.0 m/s
(D) 70.7 m/s
(E) 100.0 m/s

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統計: A(5), B(2), C(41), D(6), E(0) #2356588

詳解 (共 2 筆)

#4154595
 v = √(T/u) = √(980/...
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#4744411
box比繩重的多 繩重忽略
v=√T/u=√98 x 10/(2/10)=70m/s
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