在平面直角坐标系\(xOy\)中,过\(y\)轴上一点\(A\)作平行于\(x\)轴的直线交某函数图象于点\(D\),点\(P\)是\(x\)轴上一动点,连接\(DP\),过点\(P\)作\(DP\)的垂线交\(y\)轴于点\(E(E\)在线段\(OA\)上,\(E\)不与点\(O\)重合\()\),则称\(\angle DPE\)为点\(D\),\(P\),\(E\)的“平横纵直角”\(.\)图\(1\)为点\(D\),\(P\),\(E\)的“平横纵直角”的示意图\(.\) 如图\(2\),在平面直角坐标系\(xOy\)中,已知二次函数图象与\(y\)轴交于点\(F(0,m)\),与\(x\)轴分别交于点\(B(-3,0)\),\(C(12,0).\) 若过点\(F\)作平行于\(x\)轴的直线交抛物线于点\(N\).
\((1)\)点\(N\)的横坐标为___________;
\((2)\)已知一直角为点\(N,M,K\)的“平横纵直角”,若在线段\(OC\)上存在不同的两点\({{M}_{1}}\)、\({{M}_{2}}\),使相应的点\({{K}_{1}}\)、\({{K}_{2}}\)都与点\(F\)重合,试求\(m\)的取值范围;
\((3)\)设抛物线的顶点为点\(Q\),连接\(BQ\)与\(FN\)交于点\(H\),当\(45{}^\circ \leqslant \angle QHN\leqslant 60{}^\circ \)时,求\(m\)的取值范围.