I strongly suggest that everyone begin following Andrzej Veitia. His problems are great and most are related to physics. All of them are quite challenging and I think all but one are level 5 problems. I haven't had much success with any of the problems but they are all well designed, have a nice visual and are based off of interesting concepts in physics.
Here are some of his most recent problems:
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Yes, I too suggest to follow the person mentioned above but the problems are by the Physics Challenge Master, not by him. He is simply resharing the old problems. :)
(I am not sure but I remember seeing a "Staff" badge on his profile long ago.)
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Pranav, are the problems given by David Sir?
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Yes, as I mentioned, those problems are already published in the past weekly sets.
(I am not sure about the 4th one though.)
I also suggest the same. He's awesome! ;)
I also have a suggestion Behold The Power Of The Sun This is also a Level 5 Physics Problem.
Please reshare this post.