tỉ ssoos giữa the nang va dong nang

V

vietdung1998vp

$x = \frac{A}{2} \to \frac{{{{\rm{W}}_t}}}{{\rm{W}}} = \frac{{\frac{1}{2}k{x^2}}}{{\frac{1}{2}k{A^2}}} = {\left( {\frac{x}{A}} \right)^2} = \frac{1}{4}$
 
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