Photo Contest - Spin Angular Momentum (6/23-6/29)

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The discussion centers around a photo contest themed "Spin Angular Momentum," where participants must submit images of objects that spin on their axis. Acceptable subjects include windmills or figure skaters in motion, emphasizing that the normal behavior of the subject must involve spinning. Contest rules specify that only one photo per member is allowed, with guidelines on resizing, editing, and submission methods. Photos must be original and cannot be reused in future contests. The conversation also touches on humorous exchanges about unrelated topics, such as propellers and DIY projects, while maintaining focus on the contest's requirements. Participants are reminded of the deadline for submissions.
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Spin Angular Momentum

Your photo must have, as its main subject, something that spins on its axis. For example, a windmill. You do not have to capture a photo while it is spinning. It is sufficient to show that the objects "normal behavior" is to spin on its axis.

If, however, you are showing an object where its normal behavior is not to spin, but that it can spin under certain conditions, then you must clearly show the object in that condition. For example, a person's normal behavior is not to spin. However, a figure skater can. So you simply cannot show a photo of a person. You must show a photo of a person who is skating and doing the spin on the ice.

Get it? Good!Contest Rules:

1. Any digital photo or digitally-scanned photo relevant to the theme will be accepted within the contest period. In case there's a gray area, or you're not sure if the picture is suitable, check with me first.

2. Please resize your digital photo to no more than 800 x 600 or 600 x 800 pixels. You may also crop your picture if you wish. You are also allowed to adjust the brightness and contrast of your picture but these should not dramatically alter the look of the picture. But other than those, any form of picture editing or modification is not allowed. This is a photo contest, not a picture editing/special effect contest. You may add a watermark or your name/nickname to the photo for identification purposes.

3. Upload your photos to any of the photo servers such as imageshack or photobucket. Then post it the relevant contest thread and link your picture using the img command. PM me if you do not know how. Alternatively, you may simply upload your image file to PF, and then have the full image displayed in your post.

4. Only ONE picture per member per contest. Once a picture is posted, it cannot be changed other than a total withdrawl by that member from that week's photo contest. Exceptions will be made for modification to comply with the rules, such as resizing.

5. At the end of the contest period, I will open a poll and every PF member can vote for the picture they like best.

6. Note that in case we have a large number of entries, I will do the polling in more than one thread. If that's the case, you can vote in each of the polling threads. The photos will be assigned in the polling threads in the order they were submitted.

7. The photo of the subject must be something that you took directly, not via in intermediary medium, and not taken by someone else. Unless otherwise noted, a photo of another photo, painting, print, etc. does not qualify.

8. You can use a picture only once. Once it is used in a contest, it cannot be reused in another contest.

9. Please post only pictures meant for submission in this thread. Photos not meant for submission must not be posted in the contest thread. Posting of more than one photos by a member may result in an automatic disqualification from the week's contest.

Zz.
 
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2018-06-01 11.37.47.jpg
 

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That's a really big propeller! Why isn't it fastened to an airplane?
 
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DennisN said:
That's a really big propeller! Why isn't it fastened to an airplane?

Sigh. It is fastened to Earth to keep it revolving.
 
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paratroop.jpg
 

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angularmomentum.jpg
 

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  • #10
@Janus, congratulations, you caught it in superposition!
 
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  • #11
berkeman said:
You have a CO detector in that room, correct?
Incorrect, but not my house. It's a screened in porch, no glass panes, open to the outside on three sides. However, there is a fire extinguisher (not seen).
 
  • #12
I know it's boring, but we have to promote our DIY section!

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  • #13
  • #14
DennisN said:
That's a nice hammer, @fresh_42!
To a nail everything looks like a hammer.
 
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  • #15
DennisN said:
That's a nice hammer, @fresh_42!
The electrical motor has at least enough weight to use it like a hammer! I first thought of a HD but this damn thing didn't open although I removed six screws, and other old HD had screws I haven't a screwdriver for. Hope I'll never need a strong magnet. The next thought has been the drilling machine, but this little thing was easier to grab.
 
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  • #16
Way to drill down to the solution without screwing it up (said with a twist)!
 
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  • #17
kuruman said:
Incorrect, but not my house. It's a screened in porch, no glass panes, open to the outside on three sides. However, there is a fire extinguisher (not seen).
Sent you a PM about this, to avoid derailing the photo thread. :smile:
 
  • #18
marzena_spin_angular_momentum.jpg
 

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  • #19
I thought there would be lots like this.

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  • #20
A spinning coin caught in a superposition of heads and tails.
I did not observe if it became heads or tails, and no-one else was around, so maybe it is still in a superposition... :smile:
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  • #21
If you took the picture so that the line of sight were parallel to the surface, it would be ##Heads\cos \theta+Tails\sin \theta##. Clearly, ##\theta## is a hidden variable. :smile:
 
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  • #22
Sierra.jpg
 

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  • #23
Final day to submit your photo for this contest.

Zz.
 

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