- #1
trajan22
- 134
- 1
quick question,
A uniform, aluminum beam 9.00 m long, weighting 300 N, rests symmetrically on two supports 5.00 m apart. A boy weighing 600 N starts at point A and walks toward the right.
How far beyond point B can the boy walk before the beam tips?
ans=1.25 m
How far from the right end of the beam should support B be placed so that the boy can walk just to the end of the beam without causing it to tip?
this second part is the part I am stuck on.
my equations are
all of these are the sum of the forces in that direction
Fx=0
no forces are acting in this direction
Fy=(F(support A)+F(support B))-(F(gravity on bar)+F(gravity on boy))
force of gravity of bar is at its center of mass between the two blocks
Tz=(F(gravity on bar)*(distance)-F(gravity on boy)*(distance))
rotation point is set around point b
i was able to solve for the first part of this problem however for the second part it appears that i have 2 unknowns with 1 effective equation so I am not really sure how to go.
i have included a figure but chances are it will take some time for it to come up.
A uniform, aluminum beam 9.00 m long, weighting 300 N, rests symmetrically on two supports 5.00 m apart. A boy weighing 600 N starts at point A and walks toward the right.
How far beyond point B can the boy walk before the beam tips?
ans=1.25 m
How far from the right end of the beam should support B be placed so that the boy can walk just to the end of the beam without causing it to tip?
this second part is the part I am stuck on.
my equations are
all of these are the sum of the forces in that direction
Fx=0
no forces are acting in this direction
Fy=(F(support A)+F(support B))-(F(gravity on bar)+F(gravity on boy))
force of gravity of bar is at its center of mass between the two blocks
Tz=(F(gravity on bar)*(distance)-F(gravity on boy)*(distance))
rotation point is set around point b
i was able to solve for the first part of this problem however for the second part it appears that i have 2 unknowns with 1 effective equation so I am not really sure how to go.
i have included a figure but chances are it will take some time for it to come up.