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Black Holes, Tides, and Curved Spacetime
- De: Benjamin Schumacher, The Great Courses
- Narrado por: Benjamin Schumacher
- Duración: 12 h y 6 m
- Grabación Original
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General5 out of 5 stars 712
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Narración:5 out of 5 stars 622
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Historia5 out of 5 stars 620
Gravity controls everything from the falling of an apple to the rising of ocean’s tides to the motions of the heavens above. If you’ve ever wondered how this most puzzling force works across our entire universe, you will be delighted by this 24-part course that is accessible to any curious person, regardless of your science education. No other product on the market presents the subject of gravity in as much detail as this course, which will follow the past 400 years of research and experimentation in the field.
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3 out of 5 stars
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Good freshman high school lecture
- De Ron A. Parsons en 01-29-19
Excellent Lectures about Gravity (Physics)
Revisado: 05-05-19
I just finished listened to these lecture series by Prof Benjamin Schumacher. I enjoyed learning about the history of our understanding about gravity. While I am familiar with the physics from classical mechanics, I was glad to go into detail about the physics from general relativity. The included pdf (220 pages) was a nice addition to the lectures. Here are some of my favorite quotes:
“But a solid body held together by gravity, by a long-range attractive force between all masses, will tend to pull itself into a spherical shape. Every piece of the body is attracted to every other, even the pieces on the other side. And a sphere is the shape that minimizes the distances between all the pieces. The more massive the body, the stronger this tendency will be. But gravity is so weak that a solid body has to be many hundreds or even a thousand kilometers across before this sphere-making proclivity of gravity will win out.”
In explaining the tidal effect, Prof Schumacher instructs students to “imagine the fall of a spherical cloud of apples.” And then with a simple explanation from Newton’s law of universal gravitation he explains the mysterious force that squeezes in from the sides and also stretches out along the up-and-down direction the cloud as it falls freely.
Many lectures are ended with a preview or teaser of the next lecture, followed by a kind remark to the students, “And I’ll see you then.” I can imagine Prof Schumacher given this remark in the university.
The questions and answers on the pdf document are well though-out. The most thought-provoking question to me was Question 1 of Lecture 9: “How can we tell whether a piece of anomalous data requires us to change our basic theory?”
I recommend this lecture series to anyone interested in understanding gravity, tides, and black holes. I’m sure a future recording of the same lectures will be updated to include the important LIGO discovery in 2017.
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esto le resultó útil a 15 personas