9.15 A high-speed flywheel in a motor is spinning at 500 rpm when a power failure suddenly occurs. The flywheel has mass 40.0 kg and diameter 75.0 cm. The power is off for 30.0 s, and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 200 complete revolu- tions. (a) At what rate is the flywheel spinning when the power comes back on? (b) How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on, and how many revolutions would the wheel have made during this time? ●●
9.15 A high-speed flywheel in a motor is spinning at 500 rpm when a power failure suddenly occurs. The flywheel has mass 40.0 kg and diameter 75.0 cm. The power is off for 30.0 s, and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 200 complete revolu- tions. (a) At what rate is the flywheel spinning when the power comes back on? (b) How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on, and how many revolutions would the wheel have made during this time? ●●
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter11: Angular Momentum
Section: Chapter Questions
Problem 72P: An ice skater is preparing for a jump with turns and has his arms extended. His moment of inertia is...
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Angular speed, acceleration and displacement
Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.
Angular Position
Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.
Question
![9.15 A high-speed flywheel in a motor is spinning at 500 rpm
when a power failure suddenly occurs. The flywheel has mass 40.0 kg
and diameter 75.0 cm. The power is off for 30.0 s, and during this
time the flywheel slows due to friction in its axle bearings. During
the time the power is off, the flywheel makes 200 complete revolu-
tions. (a) At what rate is the flywheel spinning when the power
comes back on? (b) How long after the beginning of the power
failure would it have taken the flywheel to stop if the power had
not come back on, and how many revolutions would the wheel
have made during this time?
●●](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb3da0cd1-4491-4699-a531-553fdaf9ab08%2Faad53524-eea3-4da5-abcd-03f6266a603e%2Frt1ynov_processed.png&w=3840&q=75)
Transcribed Image Text:9.15 A high-speed flywheel in a motor is spinning at 500 rpm
when a power failure suddenly occurs. The flywheel has mass 40.0 kg
and diameter 75.0 cm. The power is off for 30.0 s, and during this
time the flywheel slows due to friction in its axle bearings. During
the time the power is off, the flywheel makes 200 complete revolu-
tions. (a) At what rate is the flywheel spinning when the power
comes back on? (b) How long after the beginning of the power
failure would it have taken the flywheel to stop if the power had
not come back on, and how many revolutions would the wheel
have made during this time?
●●
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