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PROBLEM 4.152
The rectangular plate shown weighs 75 lb and is held in the
position shown by hinges at A and B and by cable EF.
Assuming that the hinge at B does not exert any axial
thrust, determine (a) the tension in the cable, (b) the
reactions at A and B.
PROBLEM 4.152 (Continued)
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 4.153
A force P is applied to a bent rod ABC, which may be supported in four different ways as shown. In each
case, if possible, determine the reactions at the supports.
PROBLEM 4.F1
Two crates, each of mass 350 kg, are placed as shown in
the bed of a 1400-kg pick-up truck. Draw the free-body
diagram needed to determine the reactions at each of the
two rear wheels A and front wheels B.
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 4.F2
A lever AB is hinged at C and attached to a control cable at A.
If the lever is subjected to a 75-lb vertical force at B, draw the
free-body diagram needed to determine the tension in the cable
and the reaction at C.
PROBLEM 4.F3
A light rod AD is supported by frictionless pegs at B and C and
rests against a frictionless wall at A. A vertical 120-lb force is
applied at D. Draw the free-body diagram needed to determine
the reactions at A, B, and C.
PROBLEM 4.F4
A tension of 20 N is maintained in a tape as it passes
through the support system shown. Knowing that the
radius of each pulley is 10 mm, draw the free-body
diagram needed to determine the reaction at C.
PROBLEM 4.F5
Two tape spools are attached to an axle supported by
bearings at A and D. The radius of spool B is 1.5 in. and
the radius of spool C is 2 in. Knowing that T
B
= 20 lb and
that the system rotates at a constant rate, draw the free-
body diagram needed to determine the reactions at A and
D. Assume that the bearing at A does not exert any axial
thrust and neglect the weights of the spools and axle.
PROBLEM 4.F6
A 12-m pole supports a horizontal cable CD and is held by a
ball and socket at A and two cables BE and BF. Knowing that
the tension in cable CD is 14 kN and assuming that CD is
parallel to the x axis (
= 0), draw the free-body diagram
needed to determine the tension in cables BE and BF and the
reaction at A.
PROBLEM 4.F7
A 20-kg cover for a roof opening is hinged at corners A
and B. The roof forms an angle of 30 with the
horizontal, and the cover is maintained in a horizontal
position by the brace CE. Draw the free-body diagram
needed to determine the magnitude of the force exerted
by the brace and the reactions at the hinges. Assume that
the hinge at A does not exert any axial thrust.
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