How long to rotate *One* degree?

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Discussion Overview

The discussion revolves around calculating the time required to rotate one degree at a rotational speed of 11.2 rad/s. Participants explore different approaches to convert units and derive the time from the given speed, focusing on the relationship between radians and degrees.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant converts 11.2 rad/s to degrees per second, obtaining 641.71 °/s, and seeks clarification on how to calculate the time for one degree.
  • Another participant suggests simplifying the problem by using a smaller angle, such as 2 °/s, to understand the calculation better.
  • There is a discussion about the importance of including units in calculations, with emphasis on converting °/s to s/° to find the desired time.
  • A participant confirms that dividing 1 by 641.71 will yield the time in seconds per degree, which aligns with their goal.
  • One participant proposes converting 1 degree to radians to simplify the calculation, drawing an analogy to linear motion with speed in meters per second.

Areas of Agreement / Disagreement

Participants express various methods to approach the problem, but there is no consensus on a single solution or method. Different perspectives on unit conversion and calculation steps remain present.

Contextual Notes

Some participants highlight the need for clarity in unit conversions and the potential confusion arising from different approaches to the problem.

Who May Find This Useful

This discussion may be useful for individuals interested in rotational motion, unit conversions, and mathematical reasoning related to physics problems.

AlecWins
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Moved from technical forum, so no template
Hi,

Feels like a simple one but for reason I am stumped.

If I am rotating at 11.2 rad/s, how long will it take to rotate ONE single degree?

-
Converting 11.2 rad/s into °/s, I get 641.71 °/s. So, this is equivalent to 1.783 rev/s.
At this point, do I divide 1 revolution by how many degrees I travel per second i.e. 1/641.71?
Or
Do I divide by the number of revolutions per second i.e. 1.783/641.71?

What would be the solution to the time taken to rotate one single degree when rotating at 11.2 rad/s?

Thanks.
 
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AlecWins said:
how long will it take to rotate ONE single degree?... I get 641.71 °/s.
Replace the number with simpler one, like 2 °/s, and think how you would compute the answer to your question then.
 
Always helpful to include the units in your math - the units are multiplied divided, and canceled the same as the numbers...or ion this case - write down the units you want to answer to be in, so you can see the necessary steps.

so you are asking how to get s/° (seconds (time) to move (per) One Degree) but you have °/s...
 
Windadct said:
so you are asking how to get s/° (seconds (time) to move (per) One Degree) but you have °/s...
Thanks for the clarification, so doing 1/641.71 would convert it to s/° which is what I am ultimately looking for. Makes sense now.
 
AlecWins said:
Hi,

Feels like a simple one but for reason I am stumped.

If I am rotating at 11.2 rad/s, how long will it take to rotate ONE single degree?

-
Converting 11.2 rad/s into °/s, I get 641.71 °/s. So, this is equivalent to 1.783 rev/s.
At this point, do I divide 1 revolution by how many degrees I travel per second i.e. 1/641.71?
Or
Do I divide by the number of revolutions per second i.e. 1.783/641.71?

What would be the solution to the time taken to rotate one single degree when rotating at 11.2 rad/s?

Thanks.

Wouldn't this be easier if you convert 1 degree into radian? You already know the "speed" is 11.2 rad/s. You now need to find the time it takes to "move" 1 radian.

If you are confused with this, try this equivalent situation. You are moving with speed of 11.2 m/s. How long does it take for you to move 1 m?

Zz.
 

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