Wanxing Shi

[Wanxing Shi @WanxingStar]

#PCZ223 When I was back in my city, after raining, sometimes we can see a thin layer of oil with different colors in small water puddles. The oil layer is thin enough and has a different index of refraction than water. Therefore, thin-film interference happens.

[Wanxing Shi @WanxingStar]

#PCZ223 The index of refraction of oil is slightly greater than water, around 1.4. So, when I emerged a pencil lead into oil, the angle of refraction in oil is smaller than which in water.

[Wanxing Shi @WanxingStar]

#PCZ223 I plucked two strings of the guitar with similar strength (similar amplitude). The result of the superposition of two waves is the beats (the wah-wah-wah sound).

[Wanxing Shi @WanxingStar]

#pcz222
Alternating source
Probably capacitors
maybe inductors

[Wanxing Shi @WanxingStar]

#PCZ222
I used the videos made by @ElectroBOOMGuy to get a better understanding of electronics part, especially the AC circuit part. Thank u very much!
Lab inside house, boom my mind🙏🏻

[Wanxing Shi @WanxingStar]

#PCZ222 LED light, as light emitting diode, is constructed by semiconductors. LED are made of direct gap semiconductor materials which allows the momentum of electrons change when jumping from one hole to another therefore emitting photons. https://t.co/H4JzxU05kK

[Wanxing Shi @WanxingStar]

#PCZ222 inductor is used as voltage booster in this case. Normal Neon light requires at least 100 v to light up. However, when an inductor is connected in the circuit, the induced emf generated is big enough to support the light.
https://t.co/2nkfW061SJ

[Wanxing Shi @WanxingStar]

#PCZ222
Electric cooker
By magnetic induction
Faster than a flame

[Wanxing Shi @WanxingStar]

#PCZ222
https://t.co/Of3uJoYTrk
This special conductive concrete is made of 80% standard concrete and 20% steel and carbon. Once it’s connected to a power source, the mixture conducts electricity and generates heat to melt the snow covered on it. (Really need it right now!)

[Wanxing Shi @WanxingStar]

#PCZ222 https://t.co/sCqx5RFo5z
This video makes sense to me cuz it explains the electric field around a long charged line in details using the cylinder Gaussian surface.

[Wanxing Shi @WanxingStar]

#PCZ222
Why the fields exist.
Between charge and thin sheets
Attract or resist

[Wanxing Shi @WanxingStar]

#PCZ222 I rubbed the plastic straw with its paper package and tada~~~ they are attracted to each other due to electric force between them caused by the rubbing process.

[Wanxing Shi @WanxingStar]

#PCZ222 It’s my favorite video with minutephysics. It uses a tool like a chessboard to explain space time interval which is much less abstract!!!!! https://t.co/7q27WODeio

[Wanxing Shi @WanxingStar]

#PCZ221
Promise forever
Every experiment
No devastation

[Wanxing Shi @WanxingStar]

#PCZ221 That’s a slide in my friend’s backyard. Once we sit on the top, we have gravitational potential energy relative to the ground. When we slide down, most potential energy will be converted into kinetic energy and the rest to internal energy as heat. (That’s my roomie :))

[Wanxing Shi @WanxingStar]

#PCZ221 https://t.co/pWDq5JQQBj via @YouTube This video shows the reverse motion of Bungee jump, which takes use of the gravity. Then you can just experience bungee with some kind of VR glass~ No fear maybe

[Wanxing Shi @WanxingStar]

#PCZ221 When the book is thrown up, I rotate it at the same time. The center of mass has a translational motion being thrown up and the rotational motion being rotated.

[Wanxing Shi @WanxingStar]

Where is SORRY?

[Wanxing Shi @WanxingStar]

#PCZ221 The object I know undergoing rotational motion with constant omega is Great wheel in Seattle! It takes 12 mins to complete three revolutions and its omega almost remains constant. Omega = 2pi/4min = 0.026 rad/s

[Wanxing Shi @WanxingStar]

#PCZ221 Concern my floss as a system. The gravity as an external force does positive work on it when it falls down. Also the normal force provided by the desk does negative work on it so eventually the floss is at rest.