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  • Video 
    PAIR distinguished lecture series : a 40-year journey by Professor Reinhard Genzel

    PAIR distinguished lecture series : a 40-year journey by Professor Reinhard Genzel

    More than one hundred years ago, Albert Einstein published his Theory of General Relativity (GR). One year later, Karl Schwarzschild solved the GR equations for a non-rotating, spherical mass distribution; if this mass is sufficiently compact, even light cannot escape from within the so-called event horizon, and there is a mass singularity at the center. The theoretical concept of a 'black hole' was born, and was refined in the next decades by work of Penrose, Wheeler, Kerr, Hawking and many others. First indirect evidence for the existence of such black holes in our Universe came from observations of compact X-ray binaries and distant luminous quasars. I will discuss the forty-year journey, which my colleagues and I have been undertaking to study the mass distribution in the Center of our Milky Way from ever more precise, long-term studies of the motions of gas and stars as test particles of the space time. These studies show the existence of a four million solar mass object, which must be a single massive black hole, beyond any reasonable doubt.
    Even date: 9/2/2023
    Speaker: Prof. Reinhard GENZEL
    Hosted by: PolyU Academy for Interdisciplinary Research

    Subjects:
    Physics and Cosmology and Astronomy
    Keywords:
    Nobel Prize winners Astrophysics Astronomy Deep space -- Milky Way Black holes (Astronomy) General relativity (Physics)
    Resource Type:
    Video
     
  • Video 
    A Look into future Battery

    A Look into future Battery

    This mini-lecture introduces the future battery. The Faculty of Applied Science and Textiles (FAST) and the Institute of Textiles & Clothing (ITC) organized the mini-lecture series for more than three years. The lectures aim to enrich students' knowledge in creative perspectives and arouse their interest in Sciences, Fashion and Textiles. In view of the unpredictable development of the COVID-19 pandemic, the upcoming mini-lecture Series will be switched from face-to-face mode to online mode.

    Subjects:
    Physics and Chemistry
    Keywords:
    Storage batteries
    Resource Type:
    Video
     
  • Video 
    What is Microgravity? Discovering Interesting Phenomena in Microgravity

    What is Microgravity? Discovering Interesting Phenomena in Microgravity

    An online lecture on the topic of "What is Microgravity? Discovering Interesting Phenomena in Microgravity".This lecture of “Science World: Exploring Space to Benefit Mankind” Education Programme in the 2021/22 school year for secondary students, which aims to cultivate the interest of local youth in space science and elevate their enthusiasm for participating in the development of space technology.

    Subjects:
    Physics and Aeronautical and Aviation Engineering
    Keywords:
    Gravity Reduced gravity environments
    Resource Type:
    Video
     
  • Video 
    The Magic of Light

    The Magic of Light

    An online lecture on the topic of "The Magic of Light".This lecture is suitable for secondary school and university students as well as the general public.

    Subjects:
    Physics
    Keywords:
    Light Reflection (Optics)
    Resource Type:
    Video
     
  • Video 
    The Unexpected Math Behind Van Gogh's "Starry Night"

    The Unexpected Math Behind Van Gogh's "Starry Night"

    Physicist Werner Heisenberg said, "When I meet God, I am going to ask him two questions: why relativity? And why turbulence? I really believe he will have an answer for the first." As difficult as turbulence is to understand mathematically, we can use art to depict the way it looks. Natalya St. Clair illustrates how Van Gogh captured this deep mystery of movement, fluid and light in his work.

    Subjects:
    Physics
    Keywords:
    Turbulence Starry night (Gogh Vincent van)
    Resource Type:
    Video
     
  • Video 
    Using Graphs to Explain Motion (Screencast)

    Using Graphs to Explain Motion (Screencast)

    In this screencast, you'll observe two vehicles moving across the screen at different rates then describe the motion. Additionally, you'll select the corresponding graphs of distance vs. time, velocity vs. time, and acceleration vs. time for each vehicle.

    Subjects:
    Physics
    Keywords:
    Speed Motion
    Resource Type:
    Video
     
  • Video 
    What Is Torque? (Screencast)

    What Is Torque? (Screencast)

    Learners read a description of torque and study the factors that cause its magnitude to change.

    Subjects:
    Physics
    Keywords:
    Torque -- Measurement
    Resource Type:
    Video
     
  • Video 
    Newton's Third Law of Motion - Video

    Newton's Third Law of Motion - Video

    In this learning activity you'll examine Newton's Third Law: for every action, there is an equal but opposite reaction.

    Subjects:
    Physics
    Keywords:
    Mechanics
    Resource Type:
    Video
     
  • Video 
    Newton's First Law of Motion - Video

    Newton's First Law of Motion - Video

    The learner views several animations to study Newton's First Law of Motion, also known as "The Law of Inertia."

    Subjects:
    Physics
    Keywords:
    Inertia (Mechanics)
    Resource Type:
    Video
     
  • Video 
    Newton's Second Law of Motion - Video

    Newton's Second Law of Motion - Video

    In this learning activity you'll examine force, mass, and acceleration to understand this "Law of Acceleration."

    Subjects:
    Physics
    Keywords:
    Acceleration (Mechanics) Motion
    Resource Type:
    Video