5.
\((1)\)如图,若一几何体的三视图如图所示,则此几何体的体积是______
\((2)\)函数\(y= \dfrac{\ln x}{x} \)的最大值是________
\((3)\)如图,双曲线\( \dfrac{{x}^{2}}{{a}^{2}}- \dfrac{{y}^{2}}{{b}^{2}}=1(a,b > 0) \)的两顶点为\({A}_{1},{A}_{2} \),虚轴两端点为\({B}_{1},{B}_{2} \),两焦点为\({F}_{1},{F}_{2} \)若以\({A}_{1},{A}_{2} \)为直径的圆内切于菱形\({F}_{1}{B}_{1}{F}_{2}{B}_{2} \),切点分别为\(A,B,C,D \)则双曲线的离心率\(e{=}\) ______ ;
\((4)\)设函数\(f(x)= \dfrac{{e}^{2}{x}^{2}+1}{x},g(x)= \dfrac{{e}^{2}x}{{e}^{x}} \)
, 对任意\({x}_{1},{x}_{2}∈(0,+∞) \)
,不等式\( \dfrac{g({x}_{1})}{k}\leqslant \dfrac{f({x}_{2})}{k+1} \)
恒成立,则正数\(k\)的取值范围是______ ;