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“This year, I qualified for the USA Physics Olympiad Semifinals. (Your website has been extremely helpful to me and my friends, thank you!)”

“I couldn’t resist at least sending a thank you for helping keep me inspired.”

“I read your blog and am so proud of you…I know you work hard and you are a self motivated young man with a great future…Thank you for your solution of F=ma.”

“I have been following your blog for many months now. Thank you for all the resources you have been providing to everyone.”

“I read your portal on physics and really impressed with the amount of interest and resources you have posted.  Your intent to help others is amazing.”

“I’ve been using your website for YEARS to study for F=ma (l started the physics club at my school and had everyone using your site)…Your work is really an inspiration!”

“It is extremely helpful…We do appreciate your effort to help other students.”

“you were leading a Chinese School Physics class, and I happened to stop by and listen for a bit while you were doing relative motion. There was a problem about a soccer ball being kicked in a cross wind, and it made me really confused. I just now finally understood how that worked”

“Thank you so much for the posting the solutions, they are really helping me build confidence with QM!”

“I am taking undergrad QM at U of Houston Clear Lake this semester using the Townsend book. Thank you for posting these problem solutions. In some cases, where I have no clue as to how to proceed, you have given light. Thank you. Thank you. Thank you.”

“I am a student studying physics in Taiwan. I think that your works on writing solutions for “A Modern Approach to Quantum Mechanics” are very awesome that I can correct my mistake conveniently. I just want to say thank you for your effort.”

“I’ve read your answer to the A modern approach to quantum mechanics second edition by Townsend, it is really well written.”

“Thanks for posting this solution manual, I find it very helpful!”

“thanks for the solution by the way. They’re a life saver”

“thanks for all the topics of every year of f=ma.”

“…thanks a lot for compiling all these solutions, it’s been a great resource while studying and practicing.”

“Thanks for your great site – appreciate your resources especially related to F=ma and USAPhO”

“Thank you for a great resource for students preparing for F=ma!”

“I…want to thank you for all the solutions you post on the f=ma exams; they help me a lot, especially since sometimes the official solutions are not clear”

“Hi Mr. Huang, I just want to say thank you for your solutions. They are really helping me study for the f=ma exam.”

“I just want to thank you for your wonderful f=ma exam solutions…BTW you’re a wonderful smart guy I wish a successful future ahead of you and good luck on the f=ma exam!”

“Thank you so much for your advice, it does seem that recent exam are becoming much more conceptual so linking me to the Feynman Lectures was incredibly helpful.”

“Your webpage is so useful for the F=Ma preparation.”

“I am very thankful to you for providing solutions to classical mechanics by david morin.”

“Thank you for taking the time to respond. I will pass the information on to the student who brought it up!”

“Thank you so much for offering valuable advice and I love the websites you have.”

“I’m very impressed by your achievement…Great work.”

“Thanks for your solutions! They’re an excellent resource :)”

“You blog IS helpful! THANK YOU!”

“A physics lover myself, is interested in finding some study materials for my grade 9 son, who finds school work not challenging enough. I find your website very interesting.”
“the solutions of the problems of electrodynamics are very impressive”

“I will definitely take your advice and look to your website for help”

“I was so amazed to see your passion and achievements in your blog.”

“I would just like to express the gratitude I have for your website’s explanations, and my awe for your achievements and contributions to the scientific society. You’re truly an inspiration, and your accomplishments are overwhelming.”

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