Physics Girl: Work and Energy - Physics 101 / AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 9 (Work and Energy) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: 1. A rocket pushes a space cow, from rest, with a Force of 100N, over a distance of 10m. How much work did the rocket do? What is the final kinetic energy of the cow? How fast is the cow moving? 2. You lift a 10kg cow, with a constant velocity, 10m up. How much work did you do? How much potential energy is stored in the gravitational field? 3. You drop the cow 10m onto a big cow airbag. How fast was the cow moving right before she hit the airbag? How fast would a cow with twice as massive be moving with the same setup? 4. A giant wrecking ball with 80kg mass, is dropped from a height 0f 35m. It bounces off of a trampoline and reaches a height of 14m on the return trip. How much energy was lost to heat in the bounce? 5. A square cow slides down a frictionless ramp, starting at a height h above the ground. At the bottom, the cow starts sliding along the ground. How far does the cow slide, in terms of m, g, h, and u, where u is the coefficient of friction between the cow and the ground? [u is mu] Special thanks to Mark Rober for his encouraging shoutout and to Simone Giertz for letting me almost hit myself in the face with a bowling ball at her workshop. Credits: Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Victoria C. Page - Kaitlyn Ali Sophia Chen - Researcher/Writer Erika K. Carlson - Researcher/Writer Hope Butner - Production Assistant Levi Butner - Videographer Lauren Ivy - Set Design Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Rachel Allen - Illustrator Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants Cathy Cowern - Transcription


Click here to view video on YouTube.

minutephysics: Join Me in Voting! (If you can vote in the US)

Teacher or professor: minutephysics
Subject: Physics
Content of the Lesson: Go to http://www.vote.org or https://www.ballotready.org for information about voting in your area. To all my non-US-voting viewers... thanks for your support, and I bet you know someone in the US who can vote :) Created by Henry Reich


Click here to view video on YouTube.

Physics Girl: Gravity and Orbital Mechanics - Physics 101 / AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 8 (Gravitation and Orbits) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: 1. An object with mass M is a distance R from the center of the earth. Another object with mass 2M is at a distance 3R from the center of the earth. What is the ratio of the forces between each object and the earth? 2. What is the force of gravity between the Earth and a pineapple with mass of 1kg, if the pineapple is falling near the Earth’s surface? 3. What would the acceleration due to gravity be on a planet with half the radius, but twice the mass of Earth? 4. The ISS orbits with an average altitude of 410 km. What is its orbital velocity? What is its orbital period? 5. Extras Credit: What is the orbital velocity of an object orbiting the Earth at a height of 35,800 km above the Earth’s equator? (Don’t forget to add in the Earth’s radius!). What is the orbital period? Credits: Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Victoria C. Page - Video Editor Sophia Chen - Researcher/Writer Erika K. Carlson - Researcher/Writer Hope Butner - Production Assistant Levi Butner - Videographer Lauren Ivy - Set Design Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Rachel Allen - Illustrator Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants Cathy Cowern - Transcription


Click here to view video on YouTube.

Physics Girl: Circular Motion - Physics 101 / AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 7 (Circular Motion) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: Problem1: You have a one kilogram ball on a two meter long string. You swing it in a circle so it goes around once every two seconds. What’s the tension in the string? Problem 2: What is the magnitude of the centripetal force keeping the Earth moving in its orbit around the Sun? Problem 3: The coefficient of friction between tires and the road is about 1.0. At what angle should we bank our road if the average speed of cars driving on the road is 80 km/hr? (Don’t forget to convert to m/s!) Thank you to Derek Muller from Veritasium and for his incredibly kind shout out at the end of the video, and for encouraging people to pursue physics! And thanks to Lizzie Armanto for letting me use her footage! Credits: Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Victoria C. Page - Video Editor Sophia Chen - Researcher/Writer Erika K. Carlson - Researcher/Writer Hope Butner - Production Assistant Levi Butner - Videographer Lauren Ivy - Set Design Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Rachel Allen - Illustrator Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants Cathy Cowern - Transcription Velodrome Photo: https://flic.kr/p/cSkSDQ Fritz Zwicky Portrait: http://www.zwicky-stiftung.ch


Click here to view video on YouTube.

Physics Girl: Free Body Diagrams - Physics 101/AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 5 (Free Body Diagrams) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: Problem 1: Draw a free body diagram (FBD) for a bottle of nail polish falling straight down. Draw a FBD for a soccer ball kicked at at an angle, after the kick. What about during the kick? Problem 2: You are standing on a scale in an elevator that is accelerating upwards at a rate of 2.0 m/s². If your mass is 58kg, what does the scale read in Newtons? What would it read if you were decelerating at 2.0m/s² (accelerating at -2.0 m/s²) Problem 3: We built a human-sized Atwood machine using two masses: 65kg and 79kg. The masses fell 2.0 meters from rest and it took 2.2 seconds. What do we get for “g”? What are some possible sources of error? Problem 4: You build an Atwood Machine where the masses have a ration of 4:5. What will the acceleration of the masses be? Special thank you to the amazing Bill Nye for his shoutout at the end of the video! Credits Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Spenser Reich - Video Editor Sophia Chen - Researcher/Writer Erika K. Carlson - Researcher/Writer Hope Butner - Production Assistant Levi Butner - Videographer Kyle Kitzmiller - Consultant Andy Brown - Curriculum Consultant Lauren Ivy - Set Design Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Rachel Allen - Illustrator Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants Cathy Cowern - Transcription


Click here to view video on YouTube.

Physics Girl: Why it’s impossible to make a red bubble… or IS it?!

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Take a look at a bubble and you’ll see all the colors of the rainbow... right? WRONG. Bubbles are actually missing colors! Check out Self-Evident on PBS Voices: https://youtu.be/Bwsne4eMVyU My Patreon! https://www.patreon.com/physicsgirl If you liked this video, check out: Only some humans can see this type of light: bit.ly/pgpolarized How rainbows with NO COLOR are possible: bit.ly/pgwhiterain http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Creator/Host: Dianna Cowern Editor: Levi Butner Production Assistant: Hope Butner Thanks to Ben Ryder for the amazing footage of wave interference from his YouTube channel: https://www.youtube.com/channel/UCnIDbkWZ-92D2REQefJuoHA The awesome folks who shared their bubble pictures with me on twitter!: Andy Callaway, Philip Palermo, lifewithjess, Danny Thomas, Cate McCleery, @SbastienAndrie4, and so many more that didn't make it into the video. Special thanks to our Sally Ride level patrons: David Cichowski, Fabrice Eap, Henning Bitsch, Kenneth Hunter, Margaux Lopez, Patrick Olson, Vikram Bhat, wc993219. Join the Physics Girl Patreon community! ►► https://www.patreon.com/physicsgirl Sources: Wave interference video footage provided by Ben Ryder's YouTube channel: https://www.youtube.com/channel/UCnIDbkWZ-92D2REQefJuoHA


Click here to view video on YouTube.

Physics Girl: Newton's Laws of Motion - Physics 101 / AP Physics 1 Review - Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 4 (Newton's Laws of Motion) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: Problem 1: You push your square space cow, mass 5kg, with a force of 10N. What will be the acceleration of your space cow? Problem 2: Your tiny cow has a mass of 1kg and is standing in a field in Kansas. What force does Earth’s gravity exert on the cow? Problem 3: You are suspending two cows from the ceiling, one below the other. You have really strange hobbies. The lower cow has a mass of 2kg. The upper cow has a mass of 1kg. What is the tension in the rope between the top cow and the ceiling? Problem 4: Now you have two square cows, one mass 4kg, the other mass 2kg, lined up on a frictionless surface. You push on the first cow such that the two cows accelerate at 2 m/s^2. What force does the second cow exert on the first? Special thank you to astrophysicist and folklorist Moiya McTier for her shoutout at the end of the video! Find Moiya on Twitter @GoAstroMo Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Victoria C. Page - Video Editor Sophia Chen - Researcher/Writer Erika K. Carlson - Researcher/Writer Levi Butner - Videographer Hope Butner - Production Assistant Darren Dyk - Slow Motion Cinematography Andy Brown - Curriculum Consultant Lauren Ivy - Set Design Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Alicia Cowern - Transcription Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants


Click here to view video on YouTube.

Physics Girl: 2D Motion - Physics 101 / AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 3 (2D Motion & Kinematics) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: Problem 1 You’re jumping off a 10m high cliff with an initial horizontal velocity of 2m/s. Some rocks extend 1m out at the base of the cliff. Will you clear the rocks? By how much? Problem 2 Kick a ball at a speed of 20m/s at an angle 37º above the ground. a. How long is the ball in the air? b. How far away is the ball when it lands? c. How high did the ball go? Problem 3 Juliet throws an egg at Romeo’s window. The bottom of the window starts 6m above the ground, and the window itself is 1m tall. The egg leaves Juliet’s hand 1 m above the ground, traveling 30m/s at an angle of 60º with respect to the ground. Does she hit the window? Executive Producer/ Host/ Writer: Dianna Cowern Lead Writer & Course Designer: Jeff Brock Producer: Laura Chernikoff Video Editor: Spenser Reich Researcher/Editor: Sophia Chen Videographer: Levi Butner Production Assistant: Hope Butner Set Design: Lauren Ivy Curriculum Consultants Lucy Brock & Samantha Ward Consulting Producer: Vanessa Hill Curriculum Consultant: Andy Brown Skate Videographer: Darren Dyk Consultant: Kyle Kitzmiller Illustrator: Aleeza McCant Transcription: Alicia Cowern & Cathy Cowern


Click here to view video on YouTube.

Physics Girl: Trig Review for Physics - Common Math Tools - Physics 101, AP Physics 1 Review with Physics Girl

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Creator/Host/Writer: Dianna Cowern Producer: Laura Chernikoff Head Writer: Jeff Brock Researcher/Writer: Sophia Chen Editor: Levi Butner Exercises in this video: Problem 1: 1. You are running north-east at a speed of 4 m/s. What component of your velocity is north? How about east? Problem 2: You are kite-surfing and your kite is pulling you upwards at an angle of 60º with respect to the ocean, with a force of 1200 Newtons. What component of that force is up? How much of it is sideways, parallel to the water? Problem 3: Extra Credit: You are swimming across a river, swimming perpendicularly to the current. You can swim 1 m/s. The river has a current of 2 m/s. With respect to the shore, what is the angle of your resulting velocity vector? How fast are you swimming over the riverbed? Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Levi Butner - Videographer/ Video Editor Sophia Chen - Researcher/Writer Hope Butner - Production Assistant Andy Brown - Curriculum Consultant Set Design - Lauren Ivy Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Alicia Cowern - Transcription Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants


Click here to view video on YouTube.

minutephysics: Why Masks Work BETTER Than You'd Think

Teacher or professor: minutephysics
Subject: Physics
Content of the Lesson: Thanks to the Heising-Simons foundation for their support: https://www.hsfoundation.org (their COVID-19 grants: https://www.hsfoundation.org/grants/covid-19-response-grants/ ) Check out https://aatishb.com/maskmath to explore and for references. This video is about how masks (whether surgical, or N95, or cloth) are counterintuitive and actually work much better epidemiologically than one might expect. Masks do double-duty, and the fraction of interactions with masks is much higher than the fraction of people wearing masks, so partially adopted, partially effective masks are able to reduce the basic reproduction number surprisingly well. REFERENCES: Aatish’s detailed writeup on github: https://github.com/aatishb/maskmath/blob/master/model/mathmodel.ipynb Amid the Coronavirus Crisis, a Regimen for Re-entry: https://www.newyorker.com/science/medical-dispatch/amid-the-coronavirus-crisis-a-regimen-for-reentry Face Masks Against COVID-19: An Evidence Review https://www.preprints.org/manuscript/202004.0203/v3 Mask FAQ Test Results: https://www.maskfaq.com/test-results The Effect of Mask Use on the Spread of Influenza During a Pandemic: https://onlinelibrary.wiley.com/doi/full/10.1111/j.1539-6924.2010.01428.x Calibrated Intervention and Containment of the COVID-19 Pandemic: https://arxiv.org/ftp/arxiv/papers/2003/2003.07353.pdf Cloth Mask Breathability and Filtration Efficiency Technical Report: https://static1.squarespace.com/static/5e8126f89327941b9453eeef/t/5f2c4463a5c9f75a38d2b26f/1596736614213/N95DECON_cloth_mask_breathability_filtrationtechnical_report_v1_200804.pdf What kind of mask should I be wearing to protect against COVID-19? http://built-envi.com/what-kind-of-mask-should-i-be-wearing-to-protect-against-covid-19/ Masks for all? The science says yes. https://www.fast.ai/2020/04/13/masks-summary/ The Real Reason to Wear a Mask: https://medium.com/the-atlantic/the-real-reason-to-wear-a-mask-e6405abbc484 Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics Link to Patreon Supporters: http://www.minutephysics.com/supporters/ MinutePhysics is on twitter - @minutephysics And facebook - http://facebook.com/minutephysics And Google+ (does anyone use this any more?) - http://bit.ly/qzEwc6 Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich


Click here to view video on YouTube.

Physics Girl: I WAS THERE! How David Blaine flew helium balloons to the height of jets (and jumped)

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Check out David Blaine's video with Physics Girl's Dianna Cowern: https://www.youtube.com/watch?v=HZCJ8kZ2IKY ASCENSION full Livestream: https://www.youtube.com/watch?v=QwzvNAAqH3g David Blaine casually floated up to 25,000ft over the Arizona desert holding 52 helium balloons. I was invited to witness the testing and preparation! Thanks to David Blaine, Luke Aikins, and the rest of the team for having us and for taking such good health and safety precautions! Thanks to Kyle Kitzmiller. http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Creator/Host: Dianna Cowern Editor: Levi Butner Production Assistant: Kyle Kitzmiller Research: Sophia Chen Research: Hope Butner Research: Patrick Muhlberger Sources: Victorians who flew as high as jets: https://www.bbc.com/future/article/20160419-the-victorians-who-flew-as-high-as-jets FAA Info on Decompression Sickness https://www.faa.gov/pilots/safety/pilotsafetybrochures/media/dcs.pdf Cerebral Hypoxia Information https://www.ninds.nih.gov/Disorders/All-Disorders/Cerebral-Hypoxia-Information-Page


Click here to view video on YouTube.

Physics Girl: Freefall - Physics 101 / AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Lesson 2 of Dianna's Intro Physics Class on Physics Girl. Topic: Freefall. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: Problem 1: If we drop a wrecking ball from a height of 35 meters, how long will it take to fall? Problem 2: The ball bounces on a trampoline. It takes the ball 1.7 seconds to reach its maximum height. What is the height? How fast was the ball going when it left the trampoline? Problem 3: You dive off a diving board, 5 meters high, into a pool. You end up 2.5 meters deep in the pool. Assuming constant acceleration, what was your acceleration while the pool water was you slowing down? Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Victoria Page - Video Editor Sophia Chen - Researcher/Writer Levi Butner - Videographer Hope Butner - Production Assistant Darren Dyk - Slow Motion Cinematography Andy Brown - Curriculum Consultant Set Design - Lauren Ivy Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Alicia Cowern - Transcription Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants


Click here to view video on YouTube.

Physics Girl: Fact-Checking this Viral Bottle Trick

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Breaking the bottom out of a glass bottle by hitting the top is a challenging trick, but involves a ton of physics. The explanation is related to cavitation - a process seen in the Mantis Shrimp attack, head injuries and pouring honey! Creator/Host/Writer: Dianna Cowern Editor/Videographer: Levi Butner Research/Writer: A.J. Fillo Research: Meredith Fore Slow Motion Cinematography: Darren Dyk Thanks to Ed Ivory, Hope Butner and Kyle Kitzmiller Sources: Instructional YouTube Video Guy: https://www.youtube.com/watch?v=lDMcrvjDpCY Usage: https://phys.org/news/2020-04-pierce.html Cancer treatment: https://physicsworld.com/a/tuned-ultrasound-selectively-disrupts-the-structure-of-cancer-cells/ Mantis shrimp footage: Maya Devris and YouTube/Deep Look Shark Footage: Jan Acosta 2010 Propeller footage and animation created and owned by IET Institute for Energy Technology, University of Applied Sciences Rapperswil Bullet Footage provided by DSG technology


Click here to view video on YouTube.

Physics Girl: 1D Motion & Kinematics - Physics 101 aka AP Physics 1 Review with Dianna Cowern

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: PROBLEM 1 A girl is riding her bike with a constant velocity of 10 m/s. How far has she gone after 7 seconds? Graph her motion both in x vs t, and v vs. t. Show her displacement on both graphs. PROBLEM 2 A driver is driving at a constant velocity of 20 m/s. She steps on the gas at t=0 and accelerates to 30 m/s with constant acceleration. It took her 4 seconds to accelerate. How far did she go in those 4 seconds? Graph her motion on a v vs t graph and show the displacement on that graph. PROBLEM 3 A biker, biking at 10 m/s hits a tree and comes to a complete stop. Assuming a helmet “crumple zone” of 10 cm, what is the minimum acceleration her head could undergo? How many “g”s is that? Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Spenser Reich - Video Editor Levi Butner - Videographer Hope Butner - Production Assistant Darren Dyk - Slow Motion Cinematography Andy Brown - Curriculum Consultant Set Design - Lauren Ivy Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Alicia Cowern - Transcription Lucy Brock, Samantha Ward - Curriculum Consultants


Click here to view video on YouTube.

Physics Girl: Dianna's Intro Physics Class: Trailer - Physics 101, AP Physics 1 Review with Physics Girl

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! In this class we will cover these topics: 1D Motion Free Fall 2D Motion Newton’s Laws Free Body Diagrams Friction Circular Motion Gravity & Orbits Energy & Work Energy Conservation Power Momentum Impulse Collisions Rotation Angular Momentum Simple Harmonic Oscillations Waves Sound Electric Charge DC Circuits Creator/Host: Dianna Cowern Writer: Jeff Brock Editor: Levi Butner


Click here to view video on YouTube.

Physics Girl: 38 People on this Flight Got Sick. Why? - The Science of Ventilation

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: How likely are you to get sick on an airplane? How safe are airplanes? The science of ventilation and bioaerosol research. If you liked this video, check out: What stretching actually does to your body: https://www.youtube.com/watch?v=1JgBp7dX4AU Only some humans can see this type of light: https://www.youtube.com/watch?v=CSu0cV3fqi8 Creator/Host: Dianna Cowern Video Editing: Levi Butner Research/writing: Sophia Chen Writing/Editing: Dianna Cowern Special thanks to our Sally Ride Patrons! Special thanks to our Sally Ride level patrons: Alejandro Gutierrez, Brian O'Connell, David Cichowski, Fabrice Eap, Henning Bitsch, Kenneth Hunter, Margaux Lopez, Patrick Olson, Vikram Bhat, wc993219. Join the Physics Girl Patreon community! ►► https://www.patreon.com/physicsgirl Thanks to Malin Alsved, Hope Butner and Kyle Kitzmiller. http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Credits: Some Stock footage provided by Videvo, downloaded from www.videvo.net Resources: https://pdfs.semanticscholar.org/3a69/98741b1e14fe3e15d5fe0bc6ed4e58d83475.pdf?_ga=2.94557724.129545850.1594340593-1120174445.1589328977 [1977 info and H1n1 stat are in Lei 2017, with further details about 1977 flight here: http://blog.h1n1.influenza.bvsalud.org/en/2009/09/28/influenza-air-transmission/] [THERE’S THIS VERY COMPREHENSIVE TABLE OF RECOMMENDATIONS FROM A TRADE ASSOCIATION, THAT IS COOL TO JUST RUN THROUGH. YOU CAN PICK THE EXAMPLES YOU LIKE, BUT I’LL JUST HIGHLIGHT A FEW THAT I FOUND INTRIGUING.] https://www.ashrae.org/File%20Library/Technical%20Resources/Standards%20and%20Guidelines/Standards%20Addenda/62-2001/62-2001_Addendum-n.pdf [Source: https://www.designingbuildings.co.uk/wiki/Indoor_air_velocity] http://epibulletins.dhss.alaska.gov/Document/Display?DocumentId=888 https://www.smithsonianmag.com/smart-news/study-maps-how-flu-virus-moves-around-plane-180968541/ Transmission of COVID-19 virus by droplets and aerosols: A critical review on the unresolved dichotomy https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293495/ https://lbourouiba.mit.edu/sites/default/files/documents/14BourouibaBush-sneezecloudJFM_corrected.pdf https://up.codes/s/outdoor-airflow-rate https://www.technologyreview.com/2020/07/07/1004841/a-group-of-239-scientists-say-theres-growing-evidence-covid-19-is-airborne/?itm_source=parsely-api Timeline of COVID-19 https://www.who.int/emergencies/diseases/novel-coronavirus-2019/events-as-they-happen https://www.who.int/emergencies/diseases/novel-coronavirus-2019/technical-guidance/naming-the-coronavirus-disease-(covid-2019)-and-the-virus-that-causes-it#:~:text=The%20International%20Committee%20on%20Taxonomy,two%20viruses%20are%20different. Ventilation rates on airplanes: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.304.7321&rep=rep1&type=pdf Ventilation rates inside: https://www.epa.gov/indoor-air-quality-iaq/how-much-ventilation-do-i-need-my-home-improve-indoor-air-quality Transmission rates on airplanes https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7165818/


Click here to view video on YouTube.

Physics Girl: Insanely Fun DIY Science Experiments at Home with Physics Girl

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: If you liked this video check out these: HOME CHALLENGE: 20 Easy Experiments in 5 mins https://www.youtube.com/watch?v=8aaXZDazPxs Laser Cooling: https://www.youtube.com/watch?v=hFkiMWrA2Bc Special thanks to our Sally Ride level patrons: Alejandro Gutierrez, Brian O'Connell, David Cichowski, Fabrice Eap, Henning Bitsch, Kenneth Hunter, Margaux Lopez, Patrick Olson, Vikram Bhat, wc993219. Join the Physics Girl Patreon community! ►► https://www.patreon.com/physicsgirl Creator/Host: Dianna Cowern Editor: Levi Butner Thanks to Hope Butner and Laura Chernikoff!


Click here to view video on YouTube.

minutephysics: The Astounding Physics of N95 Masks

Teacher or professor: minutephysics
Subject: Physics
Content of the Lesson: Head to http://brilliant.org/MinutePhysics to sign up for free and get 20% off a Premium subscription to Brilliant! This video was written in collaboration with Aatish Bhatia - https://aatishb.com To learn more about using & decontaminating N95 masks: https://www.n95decon.org Thanks to Manu Prakash for useful discussion and feedback (Manu is involved with the N95 decontamination project) Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics Link to Patreon Supporters: http://www.minutephysics.com/supporters/ The physics & engineering of N95 mask design is pretty incredible. REFERENCES 10X efficiency of electrically charged fibers "The electrostatic charge of N95 masks is a major contributor to their filtration efficiency, improving it at least 10-fold over uncharged fabric" (Tsai et al., Journal of Electrostatics 2002; Peter Tsai, personal communication). Prakash Lab COVID-19 Response Group Working Draft Document on N95 masks: https://docs.google.com/document/d/1aACcbkyZjR7nZy_wWeGQ9U2iGy0y4QajBeOL8RqAZIQ/edit “Electrostatic charge contributes as much as 95% of the filtration efficiency” Molina, A., Vyas, P., Khlystov, N., Kumar, S., Kothari, A., Deriso, D., ... & Prakash, M. (2020). Project 1000 x 1000: Centrifugal melt spinning for distributed manufacturing of N95 filtering facepiece respirators. arXiv preprint arXiv:2004.13494. https://arxiv.org/pdf/2004.13494.pdf Tsai, P. P., Schreuder-Gibson, H., & Gibson, P. (2002). Different electrostatic methods for making electret filters. Journal of electrostatics, 54(3-4), 333-341. https://www.researchgate.net/profile/Phillip_Gibson/publication/222659741_Different_electrostatic_methods_for_making_electret_filters/links/5a5912cba6fdcc3bfb5ab21e/Different-electrostatic-methods-for-making-electret-filters.pdf History of Electrets Jefimenko, O. D., & Walker, D. K. (1980). Electrets. The Physics Teacher, 18(9), 651-659. https://aapt.scitation.org/doi/abs/10.1119/1.2340651 Physics of Air Filtration Hinds, W. C. (1999). Aerosol technology: properties, behavior, and measurement of airborne particles. John Wiley & Sons. https://www.wiley.com/en-us/Aerosol+Technology%3A+Properties%2C+Behavior%2C+and+Measurement+of+Airborne+Particles%2C+2nd+Edition-p-9780471194101 Scientific consortium for data-driven study of N95: https://www.n95decon.org/ N95 & virus particle sizes Bałazy, A., Toivola, M., Adhikari, A., Sivasubramani, S. K., Reponen, T., & Grinshpun, S. A. (2006). Do N95 respirators provide 95% protection level against airborne viruses, and how adequate are surgical masks?. American journal of infection control, 34(2), 51-57. http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.488.4644&rep=rep1&type=pdf Harnish, D. A., Heimbuch, B. K., Husband, M., Lumley, A. E., Kinney, K., Shaffer, R. E., & Wander, J. D. (2013). Challenge of N95 filtering facepiece respirators with viable H1N1 influenza aerosols. Infection Control & Hospital Epidemiology, 34(5), 494-499. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4646082/ Liao, L., Xiao, W., Zhao, M., Yu, X., Wang, H., Wang, Q., ... & Cui, Y. (2020). "Can N95 respirators be reused after disinfection? How many times?. ACS nano. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7202248/ MinutePhysics is on twitter - @minutephysics And facebook - http://facebook.com/minutephysics And Google+ (does anyone use this any more?) - http://bit.ly/qzEwc6 Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich


Click here to view video on YouTube.

Physics Girl: I Dipped my Hand into Boiling Hot Oil - Leidenfrost Effect?

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Dipping hand in boiling hot oil to demonstrate physical properties! Check out Prideland on PBS Voices: https://youtu.be/ZETEru4Xepk Check out PBS Deep Look https://www.youtube.com/channel/UC-3SbfTPJsL8fJAPKiVqBLg Check out PBS Above the Noise https://www.youtube.com/channel/UC4K10PNjqgGLKA3lo5V8KdQ Water in Boiling Oil - Nick Moore https://www.youtube.com/watch?v=wkAbV-yXy0M Check Out Nick’s channel! https://www.youtube.com/channel/UCT7EuC-o1dMvz-hatkytk9w Special thanks to our Sally Ride level patrons: Alejandro Gutierrez, Brian O'Connell, David Cichowski, Fabrice Eap, Henning Bitsch, Kenneth Hunter, Margaux Lopez, Vikram Bhat, wc993219. Join the Physics Girl Patreon community! ►► https://www.patreon.com/physicsgirl Creator/Writer/Host: Dianna Cowern Editor: Levi Butner High speed videography: Darren Dyk https://www.youtube.com/beyondslowmotion Thanks to Kyle Kitzmiller, Ed Ivory, Mark Rober, Dr. David willey, Nick Moore, Darren Dyk, AJ Fillo, and the Portland State Aerospace Society Sources: Thanks to Prof. David Willey https://www.youtube.com/watch?v=QJIBYPGXC8Q Indian restaurateur known for dipping hands in boiling hot oil: https://www.youtube.com/watch?v=t3-6XLdCyAM https://iopscience.iop.org/article/10.1088/1361-6404/ab37d6/pdf https://actascientific.com/ASNH/pdf/ASNH-02-0083.pdf http://volcaniclightning.tripod.com/leidenfr.htm Original Leidenfrost paper: https://books.google.com/books?hl=en&lr=&id=r3JgAAAAcAAJ&oi=fnd&pg=PA1&dq=leidenfrost&ots=e-nRxCcb9V&sig=QztGjnLcOUGUDEPF-V1KSM4AOYM#v=onepage&q=leidenfrost&f=false Translations: https://fdocuments.us/document/johann-gottlob-leidenfrost.html http://volcaniclightning.tripod.com/translation.htm 1947 study on burn injuries https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1934304/


Click here to view video on YouTube.

Physics Girl: "Of course it's scary." - Candid Interview with COVID-19 ER Nurse and Epidemiologist

Teacher or professor: Physics Girl
Subject: Physics
Content of the Lesson: Dianna from Physics Girl interviews an ER Nurse Practitioner and an Epidemiologist about their experiences with the COVID-19 pandemic. Support more science content like this by joining my Patreon community! http://patreon.com/physicsgirl Many things to my Sally Ride Level Patrons on Patreon Sally Rides: Alejandro Gutierrez, Brian O'Connell, David Cichowski, Fabrice Eap, Henning Bitsch, Kenneth Hunter, Margaux Lopez, Vikram Bhat, wc993219 More Physics Girl videos you might like: What happens when black holes collide? | EXPERT ANSWERS PHYSICS GIRL QUESTIONS https://www.youtube.com/watch?v=uSzQPAzOoYg What stretching actually does to your body ft. Sofie Dossi https://www.youtube.com/watch?v=1JgBp7dX4AU Thanks to Val Waters, Arti Virkud, Laura Chernikoff, Hope Butner and Kyle Kitzmiller More Physics Girl: http://physicsgirl.org/ http://twitter.com/thephysicsgirl http://facebook.com/thephysicsgirl http://instagram.com/thephysicsgirl Resources: https://www.ncbi.nlm.nih.gov/pubmed https://www.coronavirus.gov https://www.nih.gov/health-information/coronavirus https://www.ncbi.nlm.nih.gov/pubmed/30158180 https://paloaltoonline.com/news/2020/04/17/stanford-study-more-than-48000-santa-clara-county-residents-have-likely-been-infected-by-coronavirus https://www.medrxiv.org/content/10.1101/2020.04.14.20062463v1.full.pdf https://www.ncbi.nlm.nih.gov/pubmed/29669545 https://www.ncbi.nlm.nih.gov/pubmed/29587707


Click here to view video on YouTube.