The 11 kg disk has an angular velocity of w= 20 rad/s. (Figure 1) If the brake ABC is applied such that the magnitude of force P varies with time s shown, determine the time needed to stop the disk. The coefficient of kinetic friction at B is μ = 0.4. Neglect the thickness of the brake. Express your answer to three significant figures and include the appropriate units.

The 11 kg disk has an angular velocity of w= 20 rad/s. (Figure 1) If the brake ABC is applied such that the magnitude of force P varies with time s shown, determine the time needed to stop the disk. The coefficient of kinetic friction at B is μ = 0.4. Neglect the thickness of the brake. Express your answer to three significant figures and include the appropriate units.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section8.2: Rotational Dynamics

Problem 27PP

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The 11 kg disk has an angular velocity of w = 20 rad/s. (Figure 1)
Figure
400 mm
500 mm.
200 mm-
↓
B
500 mm --
P (N)
2
-t(s)
1 of 1
If the brake ABC is applied such that the magnitude of force P varies with time as shown, determine the time needed to stop the disk. The coefficient of kinetic friction at B is μk = 0.4.
Neglect the thickness of the brake.
Express your answer to three significant figures and include the appropriate units.
t = 5.86
μА
X Incorrect; Try Again;
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S
?
Nex

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