Statyka - ukł. sił równoległych - zła odp.??

[Jake]

Witam,

Zad.7. : Na rysunku 5.14 (pod spodem link) pokazana jest belka obciążona dźwigiem podnoszącym cięzar \(\displaystyle{ P=10 ^{4} N}\). Cięzar dźwigu wynosi \(\displaystyle{ 5*10 ^{4}N}\) i leży na prostej CD. Wyznaczyć reakcje podpór w pktach A i B, pomijając ciężar belki.

Pod spodem link do obrazka, tam także odpowiedzi podane przez skrypt (Engel, Giergiel) Nr zad.: 7.

Męczyłem sie juz nie wiem ile, by otrzymać wynik i nic, a na dobitke podane odpowiedzi sprawdzają sie tylko w 1 z 4 ułożonych przeze mnie równaniach ...



Z góry wielkie dzięki za jakieś objaśnienie, wskazówki!! (mam wielką nadzieje, że pojawi sie tu jakaś odp. ) Pozdr.

[miki999]

Wymyśliłem coś takiego.

\(\displaystyle{ {
\begin{pspicture}(0,-1.26)(4.75,1.26)
\pscircle[linewidth=0.04,dimen=outer](0.5,-0.52){0.1}
\pscircle[linewidth=0.04,dimen=outer](1.33,-0.53){0.11}
\pscircle[linewidth=0.04,dimen=outer](0.99,0.17){0.13}
\psline[linewidth=0.04cm](0.48,-0.48)(0.9,0.14)
\psline[linewidth=0.04cm](1.06,0.12)(1.3,-0.42)
\psline[linewidth=0.04cm](0.6,-0.52)(1.26,-0.52)
\psline[linewidth=0.04cm](0.48,-0.46)(0.5,0.18)
\psline[linewidth=0.04cm](0.5,0.18)(0.6,0.04)
\psline[linewidth=0.04cm](0.5,0.18)(0.38,0.04)
\psline[linewidth=0.04cm](1.34,-0.48)(1.34,0.16)
\psline[linewidth=0.04cm](1.34,0.16)(1.44,-0.02)
\psline[linewidth=0.04cm](1.34,0.16)(1.26,-0.02)
\psline[linewidth=0.04cm](1.42,-0.54)(2.02,-0.54)
\psline[linewidth=0.04cm](2.02,-0.54)(1.86,-0.44)
\psline[linewidth=0.04cm](2.0,-0.54)(1.88,-0.66)
\psline[linewidth=0.04cm](0.42,-0.54)(0.0,-0.54)
\psline[linewidth=0.04cm](0.0,-0.54)(0.08,-0.38)
\psline[linewidth=0.04cm](0.02,-0.52)(0.08,-0.72)
\psline[linewidth=0.04cm](1.0,1.02)(1.0,0.32)
\psline[linewidth=0.04cm](1.0,0.34)(1.1,0.46)
\psline[linewidth=0.04cm](1.0,0.38)(0.9,0.48)
\psline[linewidth=0.04cm](1.08,0.24)(4.42,0.86)
\psline[linewidth=0.04cm](4.42,0.86)(4.42,0.1)
\psline[linewidth=0.04cm](4.42,0.1)(4.56,0.22)
\psline[linewidth=0.04cm](4.4,0.12)(4.26,0.28)
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.6,0.1)
\lineto(4.6,0.04)
\curveto(4.6,0.01)(4.6,-0.045)(4.6,-0.07)
\curveto(4.6,-0.095)(4.6,-0.125)(4.6,-0.13)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.6,0.06)
\lineto(4.65,0.06)
\curveto(4.675,0.06)(4.71,0.045)(4.72,0.03)
\curveto(4.73,0.015)(4.725,-0.01)(4.71,-0.02)
\curveto(4.695,-0.03)(4.67,-0.045)(4.64,-0.06)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(1.22,1.22)
\lineto(1.21,1.18)
\curveto(1.205,1.16)(1.195,1.115)(1.19,1.09)
\curveto(1.185,1.065)(1.2,1.035)(1.22,1.03)
\curveto(1.24,1.025)(1.275,1.03)(1.29,1.04)
\curveto(1.305,1.05)(1.32,1.085)(1.32,1.11)
\curveto(1.32,1.135)(1.315,1.18)(1.31,1.2)
\curveto(1.305,1.22)(1.28,1.24)(1.22,1.24)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(1.24,1.12)
\lineto(1.27,1.09)
\curveto(1.285,1.075)(1.315,1.045)(1.33,1.03)
\curveto(1.345,1.015)(1.37,0.995)(1.4,0.98)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.18,-0.7)
\lineto(0.16,-0.75)
\curveto(0.15,-0.775)(0.135,-0.82)(0.13,-0.84)
\curveto(0.125,-0.86)(0.12,-0.905)(0.12,-0.93)
\curveto(0.12,-0.955)(0.12,-0.975)(0.12,-0.96)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.14,-0.66)
\lineto(0.19,-0.66)
\curveto(0.215,-0.66)(0.255,-0.675)(0.27,-0.69)
\curveto(0.285,-0.705)(0.295,-0.74)(0.29,-0.76)
\curveto(0.285,-0.78)(0.255,-0.8)(0.23,-0.8)
\curveto(0.205,-0.8)(0.165,-0.805)(0.12,-0.82)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.22,-1.02)
\lineto(0.24,-0.99)
\curveto(0.25,-0.975)(0.265,-0.96)(0.27,-0.96)
\curveto(0.275,-0.96)(0.28,-0.985)(0.28,-1.01)
\curveto(0.28,-1.035)(0.285,-1.085)(0.29,-1.11)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.46,-1.12)
\lineto(0.41,-1.15)
\curveto(0.385,-1.165)(0.345,-1.195)(0.3,-1.24)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.3,-1.12)
\lineto(0.34,-1.15)
\curveto(0.36,-1.165)(0.395,-1.195)(0.44,-1.24)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.1,0.48)
\lineto(0.11,0.35)
\curveto(0.115,0.285)(0.12,0.19)(0.12,0.16)
\curveto(0.12,0.13)(0.12,0.095)(0.12,0.08)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.12,0.48)
\lineto(0.17,0.48)
\curveto(0.195,0.48)(0.23,0.465)(0.24,0.45)
\curveto(0.25,0.435)(0.26,0.395)(0.26,0.37)
\curveto(0.26,0.345)(0.245,0.31)(0.23,0.3)
\curveto(0.215,0.29)(0.19,0.28)(0.16,0.28)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.18,0.1)
\lineto(0.21,0.13)
\curveto(0.225,0.145)(0.24,0.13)(0.24,0.1)
\curveto(0.24,0.07)(0.24,0.025)(0.24,-0.02)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.3,0.02)
\lineto(0.32,-0.01)
\curveto(0.33,-0.025)(0.34,-0.05)(0.34,-0.08)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(0.38,0.0)
\lineto(0.37,-0.04)
\curveto(0.365,-0.06)(0.345,-0.095)(0.33,-0.11)
\curveto(0.315,-0.125)(0.29,-0.15)(0.26,-0.18)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(1.66,0.26)
\lineto(1.66,0.17)
\curveto(1.66,0.125)(1.66,0.055)(1.66,0.03)
\curveto(1.66,0.0050)(1.66,-0.025)(1.66,-0.04)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(1.68,0.28)
\lineto(1.72,0.29)
\curveto(1.74,0.295)(1.775,0.29)(1.79,0.28)
\curveto(1.805,0.27)(1.81,0.245)(1.8,0.23)
\curveto(1.79,0.215)(1.765,0.19)(1.75,0.18)
\curveto(1.735,0.17)(1.715,0.155)(1.7,0.14)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(1.78,0.08)
\lineto(1.8,0.04)
\curveto(1.81,0.02)(1.82,-0.025)(1.82,-0.05)
\curveto(1.82,-0.075)(1.8,-0.105)(1.78,-0.11)
\curveto(1.76,-0.115)(1.75,-0.125)(1.76,-0.13)
\curveto(1.77,-0.135)(1.79,-0.14)(1.82,-0.14)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(1.94,-0.06)
\lineto(1.98,-0.09)
\curveto(2.0,-0.105)(2.02,-0.13)(2.02,-0.16)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(2.14,-0.1)
\lineto(2.07,-0.14)
\curveto(2.035,-0.16)(1.99,-0.195)(1.96,-0.24)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(2.08,-0.62)
\lineto(2.07,-0.73)
\curveto(2.065,-0.785)(2.055,-0.86)(2.04,-0.92)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(2.1,-0.6)
\lineto(2.15,-0.61)
\curveto(2.175,-0.615)(2.19,-0.645)(2.18,-0.67)
\curveto(2.17,-0.695)(2.14,-0.725)(2.12,-0.73)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(2.16,-0.96)
\lineto(2.19,-0.94)
\curveto(2.205,-0.93)(2.24,-0.93)(2.26,-0.94)
\curveto(2.28,-0.95)(2.29,-0.98)(2.28,-1.0)
\curveto(2.27,-1.02)(2.235,-1.04)(2.21,-1.04)
\curveto(2.185,-1.04)(2.19,-1.045)(2.22,-1.05)
\curveto(2.25,-1.055)(2.285,-1.06)(2.3,-1.06)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(2.5,-1.04)
\lineto(2.48,-1.07)
\curveto(2.47,-1.085)(2.445,-1.115)(2.43,-1.13)
\curveto(2.415,-1.145)(2.395,-1.165)(2.38,-1.18)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(2.38,-1.06)
\lineto(2.42,-1.07)
\curveto(2.44,-1.075)(2.475,-1.09)(2.49,-1.1)
\curveto(2.505,-1.11)(2.525,-1.13)(2.54,-1.16)
}
\end{pspicture}
}}\)
Możemy zapisać równania równowagi momentów sił względem pkt. \(\displaystyle{ P_1}\) i \(\displaystyle{ P_2}\). Zapomniałem narysować jednego pręta, ale dla momentów nie ma to większego znaczenia.

Mamy 2 niewiadome, 2 równania- możemy wyznaczyć \(\displaystyle{ P_{1_y}\ oraz\ P_{2_y}}\)


Ponadto możemy poniższą belkę rozdzielić na:
\(\displaystyle{ {
\begin{pspicture}(0,-0.92)(9.385,0.92)
\psframe[linewidth=0.04,dimen=outer](4.02,0.0)(0.1,-0.3)
\psellipse[linewidth=0.04,dimen=outer](4.08,-0.17)(0.1,0.11)
\psline[linewidth=0.04cm](0.12,-0.18)(0.1,0.82)
\psline[linewidth=0.04cm](0.1,0.82)(0.24,0.68)
\psline[linewidth=0.04cm](0.1,0.82)(0.0,0.68)
\psline[linewidth=0.04cm](0.12,-0.14)(1.16,-0.14)
\psline[linewidth=0.04cm](1.16,-0.14)(0.94,0.04)
\psline[linewidth=0.04cm](1.16,-0.1)(0.92,-0.36)
\psline[linewidth=0.04cm](3.62,0.6)(3.62,0.02)
\psline[linewidth=0.04cm](3.62,0.04)(3.78,0.2)
\psline[linewidth=0.04cm](3.64,0.06)(3.48,0.2)
\pscustom[linewidth=0.04]
{
\newpath
\moveto(5.12,0.84)
\lineto(5.1,0.81)
\curveto(5.09,0.795)(5.065,0.76)(5.05,0.74)
\curveto(5.035,0.72)(5.01,0.68)(5.0,0.66)
\curveto(4.99,0.64)(4.98,0.595)(4.98,0.57)
\curveto(4.98,0.545)(4.985,0.495)(4.99,0.47)
\curveto(4.995,0.445)(5.01,0.405)(5.02,0.39)
\curveto(5.03,0.375)(5.055,0.345)(5.07,0.33)
\curveto(5.085,0.315)(5.12,0.28)(5.14,0.26)
\curveto(5.16,0.24)(5.19,0.195)(5.2,0.17)
\curveto(5.21,0.145)(5.22,0.095)(5.22,0.07)
\curveto(5.22,0.045)(5.215,0.0)(5.21,-0.02)
\curveto(5.205,-0.04)(5.19,-0.08)(5.18,-0.1)
\curveto(5.17,-0.12)(5.15,-0.155)(5.14,-0.17)
\curveto(5.13,-0.185)(5.105,-0.225)(5.09,-0.25)
\curveto(5.075,-0.275)(5.045,-0.31)(5.03,-0.32)
\curveto(5.015,-0.33)(4.995,-0.36)(4.99,-0.38)
\curveto(4.985,-0.4)(4.975,-0.44)(4.97,-0.46)
\curveto(4.965,-0.48)(4.96,-0.525)(4.96,-0.55)
\curveto(4.96,-0.575)(4.96,-0.625)(4.96,-0.65)
\curveto(4.96,-0.675)(4.965,-0.72)(4.97,-0.74)
\curveto(4.975,-0.76)(4.995,-0.8)(5.01,-0.82)
\curveto(5.025,-0.84)(5.04,-0.87)(5.04,-0.9)
}
\psellipse[linewidth=0.04,dimen=outer](5.63,-0.11)(0.09,0.11)
\psframe[linewidth=0.04,dimen=outer](8.62,0.02)(5.74,-0.24)
\psline[linewidth=0.04cm](8.6,-0.12)(8.58,0.68)
\psline[linewidth=0.04cm](8.58,0.68)(8.8,0.5)
\psline[linewidth=0.04cm](8.56,0.66)(8.38,0.44)
\psline[linewidth=0.04cm](6.36,0.5)(6.36,0.0)
\psline[linewidth=0.04cm](6.36,0.0)(6.5,0.16)
\psline[linewidth=0.04cm](6.38,0.04)(6.16,0.22)
\psline[linewidth=0.04cm](6.38,0.02)(7.3,0.0)
\psline[linewidth=0.04cm](4.5,-0.18)(4.2,-0.2)
\psline[linewidth=0.04cm](4.2,-0.2)(4.32,-0.06)
\psline[linewidth=0.04cm](4.24,-0.22)(4.42,-0.34)
\psline[linewidth=0.04cm](4.1,-0.26)(4.1,-0.84)
\psline[linewidth=0.04cm](4.1,-0.84)(4.22,-0.76)
\psline[linewidth=0.04cm](4.12,-0.8)(3.96,-0.74)
\psline[linewidth=0.04cm](5.64,-0.14)(5.62,0.48)
\psline[linewidth=0.04cm](5.62,0.48)(5.8,0.34)
\psline[linewidth=0.04cm](5.64,0.44)(5.46,0.34)
\psline[linewidth=0.04cm](5.66,-0.08)(6.22,-0.1)
\psline[linewidth=0.04cm](6.22,-0.1)(6.12,-0.02)
\psline[linewidth=0.04cm](6.22,-0.1)(6.08,-0.2)
\pscustom[linewidth=0.04]
{
\newpath
\moveto(8.9,0.66)
\lineto(8.9,0.61)
\curveto(8.9,0.585)(8.9,0.535)(8.9,0.51)
\curveto(8.9,0.485)(8.9,0.44)(8.9,0.38)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(8.9,0.66)
\lineto(8.94,0.66)
\curveto(8.96,0.66)(8.985,0.645)(8.99,0.63)
\curveto(8.995,0.615)(8.985,0.585)(8.97,0.57)
\curveto(8.955,0.555)(8.955,0.535)(8.97,0.53)
\curveto(8.985,0.525)(9.015,0.505)(9.03,0.49)
\curveto(9.045,0.475)(9.07,0.445)(9.1,0.4)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(9.22,0.46)
\lineto(9.22,0.41)
\curveto(9.22,0.385)(9.22,0.365)(9.22,0.37)
\curveto(9.22,0.375)(9.22,0.405)(9.22,0.43)
\curveto(9.22,0.455)(9.225,0.5)(9.23,0.52)
\curveto(9.235,0.54)(9.26,0.565)(9.28,0.57)
\curveto(9.3,0.575)(9.32,0.565)(9.32,0.55)
\curveto(9.32,0.535)(9.3,0.515)(9.28,0.51)
\curveto(9.26,0.505)(9.26,0.49)(9.28,0.48)
\curveto(9.3,0.47)(9.335,0.45)(9.35,0.44)
\curveto(9.365,0.43)(9.365,0.41)(9.35,0.4)
\curveto(9.335,0.39)(9.295,0.38)(9.27,0.38)
\curveto(9.245,0.38)(9.22,0.375)(9.22,0.36)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.5,0.78)
\lineto(6.5,0.73)
\curveto(6.5,0.705)(6.5,0.655)(6.5,0.63)
\curveto(6.5,0.605)(6.5,0.56)(6.5,0.5)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.5,0.78)
\lineto(6.56,0.79)
\curveto(6.59,0.795)(6.63,0.785)(6.64,0.77)
\curveto(6.65,0.755)(6.645,0.725)(6.63,0.71)
\curveto(6.615,0.695)(6.585,0.675)(6.54,0.66)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.56,0.56)
\lineto(6.6,0.57)
\curveto(6.62,0.575)(6.655,0.57)(6.67,0.56)
\curveto(6.685,0.55)(6.685,0.53)(6.67,0.52)
\curveto(6.655,0.51)(6.62,0.495)(6.6,0.49)
\curveto(6.58,0.485)(6.585,0.48)(6.61,0.48)
\curveto(6.635,0.48)(6.67,0.48)(6.7,0.48)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.74,0.48)
\lineto(6.76,0.45)
\curveto(6.77,0.435)(6.79,0.415)(6.82,0.4)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.92,0.46)
\lineto(6.87,0.43)
\curveto(6.845,0.415)(6.805,0.385)(6.79,0.37)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.8,0.4)
\lineto(6.77,0.38)
\curveto(6.755,0.37)(6.72,0.345)(6.66,0.3)
}
\psline[linewidth=0.04cm](3.58,-0.04)(4.58,-0.04)
\psline[linewidth=0.04cm](4.58,-0.04)(4.48,0.14)
\psline[linewidth=0.04cm](4.56,0.0)(4.46,-0.14)
\psline[linewidth=0.04cm](6.36,0.06)(5.82,0.06)
\psline[linewidth=0.04cm](5.82,0.06)(6.0,0.22)
\psline[linewidth=0.04cm](5.88,0.04)(6.04,-0.04)
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.08,0.6)
\lineto(6.08,0.54)
\curveto(6.08,0.51)(6.08,0.455)(6.08,0.43)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.08,0.62)
\lineto(6.11,0.64)
\curveto(6.125,0.65)(6.155,0.65)(6.17,0.64)
\curveto(6.185,0.63)(6.2,0.605)(6.2,0.59)
\curveto(6.2,0.575)(6.18,0.55)(6.16,0.54)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.14,0.48)
\lineto(6.18,0.49)
\curveto(6.2,0.495)(6.225,0.48)(6.23,0.46)
\curveto(6.235,0.44)(6.22,0.415)(6.2,0.41)
\curveto(6.18,0.405)(6.16,0.395)(6.16,0.39)
\curveto(6.16,0.385)(6.165,0.38)(6.18,0.38)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.26,0.38)
\lineto(6.23,0.35)
\curveto(6.215,0.335)(6.18,0.31)(6.16,0.3)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(6.12,0.36)
\lineto(6.16,0.34)
\curveto(6.18,0.33)(6.22,0.315)(6.24,0.31)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(3.76,0.9)
\lineto(3.76,0.85)
\curveto(3.76,0.825)(3.76,0.775)(3.76,0.75)
\curveto(3.76,0.725)(3.76,0.68)(3.76,0.62)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(3.8,0.88)
\lineto(3.86,0.89)
\curveto(3.89,0.895)(3.945,0.9)(3.97,0.9)
\curveto(3.995,0.9)(4.025,0.88)(4.03,0.86)
\curveto(4.035,0.84)(4.015,0.815)(3.99,0.81)
\curveto(3.965,0.805)(3.91,0.795)(3.88,0.79)
\curveto(3.85,0.785)(3.805,0.775)(3.76,0.76)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(3.84,0.58)
\lineto(3.88,0.62)
\curveto(3.9,0.64)(3.94,0.665)(3.96,0.67)
\curveto(3.98,0.675)(4.0,0.645)(4.0,0.61)
\curveto(4.0,0.575)(4.0,0.535)(4.0,0.52)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.08,0.62)
\lineto(4.1,0.57)
\curveto(4.11,0.545)(4.125,0.52)(4.14,0.52)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.22,0.58)
\lineto(4.18,0.54)
\curveto(4.16,0.52)(4.125,0.49)(4.11,0.48)
\curveto(4.095,0.47)(4.07,0.45)(4.04,0.42)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.3,0.4)
\lineto(4.3,0.34)
\curveto(4.3,0.31)(4.3,0.255)(4.3,0.23)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.32,0.36)
\lineto(4.31,0.4)
\curveto(4.305,0.42)(4.3,0.465)(4.3,0.49)
\curveto(4.3,0.515)(4.305,0.56)(4.31,0.58)
\curveto(4.315,0.6)(4.345,0.615)(4.37,0.61)
\curveto(4.395,0.605)(4.42,0.575)(4.42,0.55)
\curveto(4.42,0.525)(4.395,0.495)(4.37,0.49)
\curveto(4.345,0.485)(4.32,0.475)(4.32,0.46)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.36,0.36)
\lineto(4.4,0.37)
\curveto(4.42,0.375)(4.44,0.345)(4.44,0.31)
\curveto(4.44,0.275)(4.44,0.23)(4.44,0.2)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.64,0.34)
\lineto(4.59,0.31)
\curveto(4.565,0.295)(4.53,0.26)(4.52,0.24)
}
\pscustom[linewidth=0.04]
{
\newpath
\moveto(4.5,0.34)
\lineto(4.53,0.31)
\curveto(4.545,0.295)(4.57,0.265)(4.58,0.25)
\curveto(4.59,0.235)(4.615,0.21)(4.66,0.18)
}
\end{pspicture}
}}\)
Oznaczenia dobierz sobie sam. Do układu po lewej możemy zapisać 3 równania równowagi i do układu po prawej również.

Nie sprawdzałem wyniku (sposobu zresztą też) i jeżeli to jakieś zad. dom. to lepiej sprawdź, bo nie jestem ekspertem z mechaniki
Ewentualnie jeżeli ktoś bardziej kompetentny to przeczyta, to niech zweryfikuje.


Pozdrawiam.

[Jake]

Mom. utwierdzenia zapomniałeś/pominąłeś.

ufff.... poszło , a tyle się męczyłem..

Wynik jest częściowo błędny (wg mnie, moze ktoś jeszcze skomentuje) tzn.
\(\displaystyle{ R _{A}=53750 N, R _{B} =6250N, M _{u} =20,5*10 ^{4}}\)

Dlaczego wydaje mi się, że Twoja metoda jest prawidłowa (oprócz tego, że logiczna)? Bo jak liczyłem dla całości:
\(\displaystyle{ M _{(A)}=M _{u} +12R _{B}-(P+Q _{dźw})4-P*4}\) to po wstawieniu wartości mom. utwierdzenia i reak.B zgadzało sie (liczyłem też to inaczej, wyznaczając odl. wypadkowej Q i P i też było ok), natomiast 2. równanie (kierunek Oy, sił poziomych nie ma):
\(\displaystyle{ R _{A}+R _{B}=Q+P}\) - nie zgadzało sie , czyli prawdopodobnie z tą siłą reakcji A było coś nie tak (powinno z tego wyjść właśnie 53750..

Dzieki wielkie. ALeż na tym czasu straciłem.. szkoda życią.. nast. razem szybciej uderze do Mózgów. Pozdr.

P.S. Wszystkie moje równ. były prawidłowe ( o ile to jest dobrze ) - przynajmniej tyle z tego pożytku..