selected problems from chapter 12. 1) 2) 240 n t bc cos(30) t bc sin(30) t ab
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Selected Problems from Chapter 12
1)
2)
sin(30)
240480
0.5
3cos(30) 480 416
2
BC
BC
AB BC
T W
T N
T T N
240 N
TBCcos)30)
TBCsin)30)
TAB
3)
20 N80N
TAC TBD
Take the torque around A:
TBD x1.5 = 80x0.5+20x0.75
Find TBD .
4)
Take the torque around the middle point.
Total positive torque = total negative torque
0.5 9.8 30 0.3 9.8 10 0.6 9.8 ( 50)x
Find the value of x
5)
Take the torque around the pin point
Total positive torque = total negative torque
8 sin 60 75 5T
find T
6)
Take the torques around O
Total positive torque = total negative torque
720 x 1.5 = Fw x 4
Find Fw
7)
Take the torques around the hinge point
Total positive torque = total negative torque
T x L sin (15) = 10.0 x g x L/2 cos (60) + 5.0 x g x L cos (60)
Find T.
8)
3 211
/
/
500 9.8 / (4.00 10 )2.00 10
/ 4.5
.
F AE
L L
m
L mm
Find L in mm
9)
