Angular Acceleration: Solve 500-700rev/sec in 30sec

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Homework Help Overview

The problem involves calculating the average angular acceleration of a fan that increases its speed from 500 to 700 revolutions per second over a specified time period. The subject area pertains to rotational motion and angular kinematics.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the calculation of angular acceleration, with one attempting to derive it using the change in revolutions per second. Others raise questions about unit conversion and the implications of a potential misprint in the time duration.

Discussion Status

The discussion is ongoing, with participants providing input on the calculations and questioning the accuracy of the time duration stated in the original problem. There is no explicit consensus on the correct approach or final answer yet.

Contextual Notes

There is a noted discrepancy regarding the time duration in the problem statement, with one participant suggesting it should be 3.0 seconds instead of 30 seconds. This has implications for the calculations being discussed.

Sparky500
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Homework Statement



A fan increases in speed from 500 to 700rev/sec in 30 seconds. What is the average angular acceleration during that time?


Homework Equations





The Attempt at a Solution



The answer i get for this one is

∝=(700-500 rev⁄sec)/3sec

any input appreciated
 
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well, same problem again.

1. the angular acceleration has the units of rad/s^2
2. how many rad is 200 rev?
 
sorry i have given the wrong answer for you to look at, the correct answer (one i have) should have read:

=418.9 rad⁄s^2
 
200 * 2pi / 30 = 41.89 ...
 
hi, just noticed that i had a misprint in my original question above (sorry about this) in the question it says 30 secs whereas it should read 3.0 secs.
therefore would my original answer be the correct one (sorry)
 

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