Physics
posted by J .
Find the forces exerted by the two supports of a 4.0m, 50kg diving board when a 60kg woman stands at its end. The two supports are 0.8m apart. This time consider the mass of the diving board.

x1= 0.8m the distance between supports.
x2= 1.2 m  the distance between the righthand support anf the center of mass of the board,
x3 =3.2 m –the distance between the righthand support and the diver.
m1= 50 kg, m1•g = 490 N,
m2= 60 kg, m2•g = 588 N.
F1 is the downward force on the lefthand support,
F2 is the upward force on the righthand support.
Three torques act about the right support
τ1=+F1•x1,
τ2 =  m1•g•x2,
τ3 =  m2•g•x3,
Σ τ= τ1 +τ2 +τ3 = 0,
F1•0.8  490•1.2  588•3.2 = 0,
F1=(490•1.2 + 588•3.2)/0.8 =3087 N
ΣF =  F1 + F2  m1•g  m2•g = 0,
3087+F2490588 =0
F2 = 3087+ 490+588=4165 N