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PROBLEM 16.13 (Continued)
PROBLEM 16.14
Bars AB and BE, each of mass 4 kg, are welded together and are pin-
connected to two links AC and BD. Knowing that the assembly is
released from rest in the position shown and neglecting the masses of
the links, determine (a) the acceleration of the assembly, (b) the forces
in the links.
PROBLEM 16.15
At the instant shown the tensions in the vertical ropes AB and
DE are 300 N and 200 N, respectively. Knowing that the mass
of the uniform bar BE is 5 kg, determine, at this instant, (a) the
force P, (b) the magnitude of the angular velocity of each rope,
(c) the angular acceleration of each rope.
PROBLEM 16.16
Three bars, each of mass 3 kg, are welded together and are pin-
connected to two links BE and CF. Neglecting the weight of the
links, determine the force in each link immediately after the system
is released from rest.
PROBLEM 16.17
Members ACE and DCB are each 600 mm long and are connected by
a pin at C. The mass center of the 10-kg member AB is located at G.
Determine (a) the acceleration of AB immediately after the system
has been released from rest in the position shown, (b) the
corresponding force exerted by roller A on member AB. Neglect the
weight of members ACE and DCB.
PROBLEM 16.17 (Continued)
PROBLEM 16.18
A prototype rotating bicycle rack is designed to save space at a
train station. The combined weight of platform BD and the
bicycle is 40 lbs and is centered at 1 ft. above the midpoint of
the platform. The motor at A causes the support beam AB to
have an angular velocity of 10 rpm and zero angular
acceleration at θ = 30°. At this instant, determine the vertical
components of the forces exerted on platform BD by the pins
at B and D.
PROBLEM 16.19
The triangular weldment ABC is guided by two pins that slide
freely in parallel curved slots of radius 6 in. cut in a vertical
plate. The weldment weighs 16 lb and its mass center is located
at Point G. Knowing that at the instant shown the velocity of
each pin is 30 in./s downward along the slots, determine (a) the
acceleration of the weldment, (b) the reactions at A and B.
PROBLEM 16.19 (Continued)
PROBLEM 16.20
The coefficients of friction between the 30-lb block and the 5-lb platform
BD are
0.50
s
µ
=
and
0.40.
k
µ
=
Determine the accelerations of the block
and of the platform immediately after wire AB has been cut.
