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PROBLEM 18.73 (Continued)
PROBLEM 18.74
The shaft of Problem 18.68 is initially at rest
(0)
when a couple
M
0
is applied to it. Knowing that the
resulting angular acceleration of the shaft is
2
(20 rad/s ) ,αi
determine (a) the couple
M
0
, (b) the
dynamic reactions at A and B immediately after the
couple is applied.
PROBLEM 18.68
The 8-kg shaft shown has a uniform
cross section. Knowing that the shaft rotates at the
constant rate
12 rad/s,
determine the dynamic
reactions at A and B.
PROBLEM 18.74 (Continued)
PROBLEM 18.75
The assembly shown weighs 12 lb and consists of 4 thin 16-in.-
diameter semicircular aluminum plates welded to a light 40-in.-
long shaft AB. The assembly is at rest
(0)
at time t 0
when a couple 0
M
is applied to it as shown, causing the
assembly to complete one full revolution in 2 s. Determine
(a) the couple
M
0
, (b) the dynamic reactions at A and B at
0.t
PROBLEM 18.75 (Continued)
PROBLEM 18.76
For the assembly of Problem 18.75, determine the dynamic
reactions at A and B at
2s.t
PROBLEM 18.75
The assembly shown weighs 12 lb and
consists of four thin 16-in.-diameter semicircular aluminum
plates welded to a light 40-in.-long shaft AB. The assembly is at
rest
(0)
at time t
0
when a couple 0
M
is applied to it as
shown, causing the assembly to complete one full revolution in
2 s. Determine (a) the couple
M
0
, (b) the dynamic reactions at
A and B at
0.t
2r
3r
3r
PROBLEM 18.76 (Continued)
PROBLEM 18.77
The sheet-metal component shown is of uniform thickness
and has a mass of 600 g. It is attached to a light axle
supported by bearings at A and B located 150 mm apart. The
component is at rest when it is subjected to a couple
M
0
as
shown. If the resulting angular acceleration is
2
(12 rad/s ) ,k
determine (a) the couple
M
0
, (b) the
dynamic reactions at A and B immediately after the couple
has been applied.
PROBLEM 18.77 (Continued)
PROBLEM 18.77 (Continued)
