SITUATION 3. A slender rod of length I and weight W is pivoted at one end as shown. It is released from rest in a horizontal position and swings freely. The value of W = 1.8 lb and L = 3 ft AC -L 9. Determine the angular velocity-(rad/s) as it passes through a vertical position. a.) 5.148 b.) 5.674 c.) 4.721 d.) 4.485 10. Determine the corresponding reaction in lbs at the pivot. a.) 5.40 b.) 6.30 c.) 4.50 d.) 6.7 B 9.

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Chapter11: Angular Momentum
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SITUATION 3. A slender rod of length I and weight W is pivoted at one end as shown. It is released
from rest in a horizontal position and swings freely.
The value of W = 1.8 lb and L = 3 ft
A
L
B
9.
9. Determine the angular velocity (rad/s) as it passes through a vertical position.
a.) 5.148
b.) 5.674 c.) 4.721
d.) 4.485
10. Determine the corresponding reaction in lbs at the pivot.
a.) 5.40 b.) 6.30
c.) 4.50
d.) 6.7
11. A 200-kg flywheel is at rest when a constant 300 N-m couple is applied. After executing 560 revolutions, the
flywheel reaches its rated speed of 2400 rpm. Knowing that the radius of gyration of the flywheel is 0.4m,
determine the average magnitude of the couple due to kinetic friction in the bearing.
a.) 14.240 b.) 12.768
c.) 11.824
d.) 13.721
12. The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. The
110-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. Knowing that the kinetic
friction of the rotor produces a couple with a magnitude of 2.5 lb-ft, determine the number of revolutions
that the rotor executes before coming to rest.
a.) 8.693
b.) 9.365 c.) 11.024
d.) 12.351
Transcribed Image Text:SITUATION 3. A slender rod of length I and weight W is pivoted at one end as shown. It is released from rest in a horizontal position and swings freely. The value of W = 1.8 lb and L = 3 ft A L B 9. 9. Determine the angular velocity (rad/s) as it passes through a vertical position. a.) 5.148 b.) 5.674 c.) 4.721 d.) 4.485 10. Determine the corresponding reaction in lbs at the pivot. a.) 5.40 b.) 6.30 c.) 4.50 d.) 6.7 11. A 200-kg flywheel is at rest when a constant 300 N-m couple is applied. After executing 560 revolutions, the flywheel reaches its rated speed of 2400 rpm. Knowing that the radius of gyration of the flywheel is 0.4m, determine the average magnitude of the couple due to kinetic friction in the bearing. a.) 14.240 b.) 12.768 c.) 11.824 d.) 13.721 12. The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. The 110-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. Knowing that the kinetic friction of the rotor produces a couple with a magnitude of 2.5 lb-ft, determine the number of revolutions that the rotor executes before coming to rest. a.) 8.693 b.) 9.365 c.) 11.024 d.) 12.351
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