COSMOS: Complete Online Solutions Manual Organization System
Chapter 4, Solution 51.
Free-Body Diagram:
ΣM E = 0:
ME + (16.2 kN)x + (5.4 kN)(2.6 m) – T(1.5 m) = 0
ME = (1.5 T − 16.2 x – 14.04) kN ⋅ m
(1)
For x = 0.6 m, (1) gives:
(ME )1 = (1.5 T − 23.76) kN ⋅ m
For x = 7 m, (1) gives:
(ME )2 = (1.5 T − 127.44) kN ⋅ m
(a)
The maximum absolute value of ME is obtained when (ME )1 = − (ME ) and
1.5 T − 23.76 kN = − (1.5 T – 127.44 kN)
T = 50.400 kN
(b)
or T = 50.4 kN
For this value of T:
ME = 1.5(50.400) kN ⋅ m − 23.76 kN ⋅ m
= 51.84 kN ⋅ m
or ME = 51.8 kN ⋅ m