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PROBLEM 6.141
A 39-ft length of railroad rail of weight 44 lb/ft is lifted by the tongs
shown. Determine the forces exerted at D and F on tong BDF.
PROBLEM 6.142
A log weighing 800 lb is lifted by a pair of tongs as shown.
Determine the forces exerted at E and F on tong DEF.
PROBLEM 6.143
The tongs shown are used to apply a total upward force of 45 kN on a pipe cap.
Determine the forces exerted at D and F on tong ADF.
PROBLEM 6.144
If the toggle shown is added to the tongs of Problem 6.141 and a single
vertical force is applied at G, determine the forces exerted at D and F on
tong ADF.
PROBLEM 6.145
The pliers shown are used to grip a 0.3-in.-diameter rod.
Knowing that two 60-lb forces are applied to the handles,
determine (a) the magnitude of the forces exerted on the
rod, (b) the force exerted by the pin at A on portion AB of
the pliers.
PROBLEM 6.146
Determine the magnitude of the gripping forces exerted
along line aa on the nut when two 50-lb forces are applied
to the handles as shown. Assume that pins A and D slide
freely in slots cut in the jaws.
PROBLEM 6.147
In using the bolt cutter shown, a worker applies two 300-N
forces to the handles. Determine the magnitude of the
forces exerted by the cutter on the bolt.
PROBLEM 6.148
Determine the magnitude of the gripping forces produced
when two 300-N forces are applied as shown.
PROBLEM 6.149
Determine the force
P
that must be applied to the toggle CDE to
maintain bracket ABC in the position shown.
Similarly,
()5()
DE y DE x
FF
0: ( ) ( )
yDEyCDy
FFF
It follows that
()()
DE x CD x
FF
0: ( ) ( ) 0
xDExCDx
FPFF
1
()()2
DE x CD x
FF P
Also,
1
()()5 2.5
2
DE y CD y
FF PP
Free body: Member ABC:
1
0: (2.5 )(300) (450) (910 N)(150) 0
2
A
MPP
(750 225) (910 N)(150)P
140.0 NP
PROBLEM 6.150
Determine the force
P
that must be applied to the toggle CDE to maintain
bracket ABC in the position shown.
0: ( ) ( )
yDEyCDy
FFF
It follows that
()()
DE x CD x
FF
0: ( ) ( ) 0
xDExCDx
FFFP
1
()()2
DE x CD x
FF P
Also,
1
()()5 2.5
2
DE y CD y
FF PP
Free body: Member ABC:
1
0: (2.5 )(300) (450) (910 N)(150) 0
2
A
MPP
(750 225) (910 N)(150)P
260 NP
