41. A wire of length L, Young’s modulus Y, and cross-sectional area A is stretched elastically by an amount ∆L . It behaves as a spring by using the Hooke’s law. What is the work done in stretching the wire by an amount ∆L?
(A)
(B)
(C)
(D)
(E)

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統計： A(1), B(1), C(0), D(27), E(1) #2974204

面試倒楣鬼-22幸運上後西

B1 · 2022/07/31

#5576019

視為彈簧去分析算式
會發現彈性係數k = YA/L , x =△L
max F = kx = △L * YA/L ,
work = (1/2)kx² = (1/2)(YA/L) △L²(D)

41. A wire of length L, Young’s modulus Y, and cross-sectional area A is stretched elastically by an amount ∆L . It behaves as a spring by using the Hooke’s law. What is the work done in stretching the wire by an amount ∆L? (A) (B) (C)(D) (E)