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  1. 1 point
    This week on Wednesday, I had to get an MRI for my knee to make sure everything was ok after I injured myself playing soccer a couple weeks earlier. While I was there, I was very curious about how the whole process worked and how it relates to physics so I did some research and here is what I found. In an article from medicalnewstoday.com titled MRI Scans: All You Need To Know by Peter Lam, I learned that "an MRI scanner contains two powerful magnets" and "upon entering an MRI scanner, the first magnet causes the body's water molecules to align in one direction, either north or south." So this is why I had to take off my earrings before going into the scanner because otherwise it would've been attracted to the magnet and cause problems. I then learned that "the second magnetic field is then turned on and off in a series of quick pulses, causing each hydrogen atom to alter its alignment and then quickly switch back to its original relaxed state when switched off. The magnetic field is created by passing electricity through gradient coils, which also cause the coils to vibrate, resulting in a knocking sound inside the scanner." This would explain why the machine was so loud and I had to wear headphones to block out the noise. But luckily, I got to listen to some country music to block out the sound of the banging. The scanner then detects these changes "and, in conjunction with a computer, cman create a detailed cross-sectional image for the radiologist to interpret." Lucky for me, my MRI showed that my knee looked very good and my injury was most likely a bone bruise. MRI's are very helpful tools for diagnosing patients and getting a better look inside the human body and I can appreciate knowing a little bit more about how they work! Visit: https://www.medicalnewstoday.com/articles/146309.php to read the full article.
  2. 1 point
    I feel the same way! We can do this!
  3. 1 point
    Absolutely fantastic post, and I love the jumper from Stanley -- that's how you serve aggressive!
  4. 1 point
    Dear Mr. Vank -- it's fantastic that you landed on the moon... but did you land on time?
  5. 1 point
    Ethan you're the man. Keep studying hard!
  6. 1 point
    You can do it Mady!
  7. 1 point
    Ethan you're the man. Keep studying hard!
  8. 1 point


    Honors Physics Essentials is an easy-to-read guide to algebra-based introductory physics, featuring more than 500 worked-out problems with full solutions and covering topics such as: kinematics, dynamics, momentum, impulse, gravity, uniform circular motion, rotational kinematics, work, energy, power, electrostatics, circuits, magnetism, microelectronics, waves, sound, optics, thermal physics, fluids, and modern physics. This book is designed to assist beginning physics students in their high school and introductory college physics courses as an invaluable supplemental resource in class as well as a review guide for standardized physics assessments such as the SAT Subject Test in Physics, PRAXIS Physics, and CST Physics exams. Honors Physics Essentials is integrated with the APlusPhysics.com website, which includes online question and answer forums, videos, animations, and supplemental problems to help you master the essential concepts of physics. Praise for Honors Physics Essentials: "This book is thorough and entertaining. The physics concepts are explained clearly enough for anyone to understand." -- Jeff, Physics Teacher. "If you are looking for an SAT Physics review book, or a review book for any non-calculus physics test, I'd recommend the Honors Physics Esssentials book. The charts and illustrations helped me organize key information, and I felt like I understood the concepts behind every question on the test." -- Nick, High School Physics Student. "I highly recommend this book to anyone who is having a hard time with entry level college physics. Quite frankly, I wish my school would adopt this book as our official text." -- Missy, College Physics Student. This is a license for a digital download of the PDF version for use by one person only on up to five electronic devices. This document may not be re-distributed, re-sold, or licensed to any other user.


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