Flywheel Deceleration: Revolutions, Linear Acceleration, and Time Calculations

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Homework Help Overview

The problem involves a flywheel that is decelerating uniformly from an initial speed of 800 revolutions per minute to rest over a period of 6 seconds. The discussion focuses on calculating the number of revolutions made before coming to rest, determining linear acceleration components, and exploring the timing of equal radial and tangential accelerations.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the calculations for the number of revolutions and express difficulty in progressing through the problem, particularly with parts b and c. There is a suggestion to create a diagram to aid understanding.

Discussion Status

Some participants have made attempts at part a, arriving at a figure of 40 revolutions, while others express uncertainty about how to proceed with subsequent parts of the problem. The discussion reflects a mix of attempts and questions, with no clear consensus on the next steps.

Contextual Notes

The problem requires the creation of a vector diagram for part b, which some participants note as a necessary step but have not yet completed. There is an emphasis on the need for clarity regarding the components of acceleration and their relationship to the flywheel's motion.

2502floyd
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Can anyone please please please :cry: help?

A flywheel initially rotating at a speed of 800 rev/min, is brought to rest with uniform angular deceleration in 6 secs.

a. How many revolutions does the flywheel make before coming to rest?

b. Determine the magnitude and direction of the resultant linear acceleration of a point A on the flywheel 0.2s before coming to rest. Draw a vector diagram showing the magnitude and direction of the resultant linear acceleration and its radial and tangentail components. A is positioned at a fixed radius of 160mm from the axis of rotation.

c. At what time will both the radial and tangential components of acceleration be equal in magnitude.

:cry: :cry: :cry:
 
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What have you done up till now ?
 
Part a.

I make it 40 revolutions
I can't do part c because I can't do part b
 
2502floyd said:
Part a.

I make it 40 revolutions
I can't do part c because I can't do part b

The question asks you to make a diagram (which you should do anyway). So why not make one? Or try?
 

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