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PROBLEM 18.89 (Continued)
PROBLEM 18.89 (Continued)
PROBLEM 18.90
The slender rod AB is attached by a clevis to arm BCD which
rotates with a constant angular velocity
about the centerline
of its vertical portion CD. Determine the magnitude of the
angular velocity .
PROBLEM 18.90 (Continued)
cos30 sin30
LL
mg mr
Mk kH
PROBLEM 18.91
The slender rod AB is attached by a clevis to arm BCD which rotates with a constant
angular velocity
about the centerline of its vertical portion CD. Determine the
magnitude of the angular velocity .
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 18.91 (Continued)
2
cos30 sin30
22
B
G
LL
mg mr
Mk kH
22
313
4448
mgL mLr mL
kk
2
313
4448
grL
2
31 3
9.81 0.029904 0.3
44 48
2232.11
15.24 rad/s
PROBLEM 18.92
The essential structure of a certain type of aircraft turn indicator is shown.
Springs AC and BD are initially stretched and exert equal vertical forces at A
and B when the airplane is traveling in a straight path. Each spring has a
constant of 600 N/m and the uniform disk has a mass of 250 g and spins at
the rate of 12,000 rpm. Determine the angle through which the yoke will
rotate when the pilot executes a horizontal turn of 800-m radius to the right at
a speed of 720 km/h. Indicate whether point A will move up or down.
PROBLEM 18.92 (Continued)
PROBLEM 18.93
The 10-oz disk shown spins at the rate
1
750
rpm, while
axle AB rotates as shown with an angular velocity
of
6 rad/s. Determine the dynamic reactions at A and B.
PROBLEM 18.94
The 10-oz disk shown spins at the rate
1
750 rpm,
while axle AB rotates as shown with an angular velocity
2
. Determine the maximum allowable magnitude of
2
if the dynamic reactions at A and B are not to exceed
0.25 lb each.
