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Evidence has been accumulating for several decades that many galaxies harbor central mass concentrations that may be in the form of black holes with between a few million to a few billion time the mass of the Sun.
In this public lecture, Professor Genzel discusses measurements over the last two decades, employing high resolution infrared and radio imaging and spectroscopy on large ground-based telescopes that prove the existence of such a massive black hole in the centre of our Milky Way, beyond any reasonable doubt. These data also provide key insights into its properties and environment.
Future interferometric studies of the Galactic Center black hole promise to be able to test gravity in its strong field limit. Professor Genzel also briefly summarizes the cosmological evolution of massive black holes.
This event is brought to you by the Australian Institute of Physics and the Black Hole Society, and took place on Monday 27 July 2009. (1:08:04)
Found by teresahopson in Black Holes
July 30, 2012 at 03:18 PM
Ages: 16 - 18
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We define and discuss how to draw Free Body Diagrams which are also called Force Diagrams. In addition we define the force normal and the force applied. Force of friction and center of mass are briefly discussed, however, a much more detailed discussion of each is left for later lessons. Free Body Diagrams are drawn on a level surface and on an incline.
Content Times:
0:12 Defining Free Body Diagram or Force Diagram
0:46 Center of mass
1:13 The force of gravity
2:08 The force normal
3:28 Adding a force applied
4:02 The force of friction
4:53 Adding an incline
5:54 The force of friction caused by the incline
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Next Video: The Reality of our First Free Body Diagram
Previous Video: Weight and Mass are Not the Same
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Found by Flipping Physics in Forces
November 13, 2014 at 08:48 AM
Ages: 10 - 18
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In this video we examine the many causes of landslides. These mass movements of earth occur when gravity overcomes the frictional forces keeping layers of rock in place on a slope, resulting in planes of land moving and falling. (01:54)
Found by teresahopson in Soil and Erosion
September 26, 2017 at 03:47 PM
Ages: 10 - 18
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Sal Khan discusses whether the normal force balances the force of gravity for a frozen sock or a frozen banana. (07:12)
Found by teresahopson in Force & Balance
July 22, 2012 at 05:22 PM
Ages: 15 - 18
License: CC by-nc-nd
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Understanding Newton’s Universal Law of Gravitation. Including a dramatization of The Cavendish Experiment and force visualization via qualitative examples. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:11 Reviewing the standard Force of Gravity or Weight equation
0:56 Newton’s Universal Law of Gravitation
1:48 Defining r
2:47 The Cavendish Experiment
3:52 Visualizing qualitative examples
5:59 When to use the two Force of Gravity equations
Next Video: gravity.html">How Much is a Mermaid Attracted to a Doughnut?
Thank you to Bronson Hoover of dnbstudios for letting me use his original composition Bèke as Henry Cavendish’s background music.
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Previous Video: Conical Pendulum Demonstration and Problem
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Thank you to Scott Carter, Jonathan Everett, and Christopher Becke for being my Quality Control Team for this video.
Found by Flipping Physics in Gravity
November 12, 2017 at 05:05 PM
Ages: 10 - 18
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(12:44) Learn with Billy as he uses the Work-Energy Theorem or what I prefer to call the Net Work-Kinetic Energy Theorem to solve a problem. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:36 The problem statement
1:02 The Net Work-Kinetic Energy Theorem
2:03 The Net Work on the Horizontal Surface
3:39 The Net Work on the Incline
4:05 The Work done by the Force of Gravity
5:40 The Work done by the Force of Kinetic Friction
7:24 Substituting back into the Net Work equation
9:31 Positive vs. Negative Work
10:56 A generally overview of what happens to all the energies
11:57 Energy percentages
Need help understanding theta 1?
Next Video: Introduction to Power
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Previous Video: Deriving the Work-Energy Theorem using Calculus
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Found by Flipping Physics in Work
February 26, 2016 at 12:16 PM
Ages: 14 - 18
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Meet the experts of possibly the scariest phenomenon in the universe - super massive black holes. Described as gravity gone mad, whole solar systems can be sucked into these terrifying masses. Supermassive black holes are a million to a billion times the massive of a typical black hole. They could fill a solar system. At the heart of a supermassive black hole is one of the most mysterious things to physics, it is a singularity, where time space and all known laws of physics fall apart. Solving what happens at the center requires new physics, which we just don’t have right now. Video is of good quality, the information is for middle or high school students. (03:16)
Found by Barb in Black Holes
July 26, 2009 at 02:26 PM
Ages: 10 - 16
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Calculate the altitude of a satellite in geosynchronous orbit or geostationary orbit.
Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:11 What is geosynchronous orbit?
0:47 Drawing the free body diagram and starting to solve the problem
3:02 Solving for the satellite’s angular velocity
4:05 Identifying the masses and radii
5:25 Defining “r” and solving for altitude
6:29 The physics works!
Next Video: Dropping a Bucket of Water - Demonstration
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Previous Video: gravity.html">Deriving the Acceleration due to Gravity on any Planet and specifically Mt. Everest
Please support me on Patreon!
Thank you to Christopher Becke and Aarti Sangwan for being my Quality Control Team for this video.
Thank you to Youssef Nasr for transcribing the English subtitles of this video.
Found by Flipping Physics in Gravity
December 10, 2017 at 07:27 PM
Ages: 12 - 18
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This teacher-made presentation is a short lesson that describes force, labels, motion, and how to add and subtract force vectors. Other key vocabulary words addressed include: push, pull, magnitude, newtons, friction, gravity, lift, drag, weight, thrust, net force, unbalanced force, and balanced force. (04:41)
Found by begamatt in Force and Motion
March 21, 2011 at 11:46 AM
Ages: 9 - 18
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The laws of gravity have gone haywire at The Mystery Spot in Santa Cruz, California, where balls roll uphill and broomsticks stand on end. In this video clip, get the true story behind this mysterious destination. (2:45)
Found by CourtneyMorrison in Santa Cruz
April 22, 2012 at 03:08 PM
Ages: 12 - 18
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In this four-minute video, physicists study the primal forces of the
universe-gravity, electro-magnetics and the strong and weak nuclear
force as part of a series on the most important discoveries in the field of physics.
Found by freealan in Physics
June 16, 2011 at 09:57 PM
Ages: 8 - 18
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Professor Lewin packs a ton of information in this lecture. He covers Archimede's principle and hydrostatic pressure. He demonstrates how the center of gravity determines the stability of ships and also uses a helium filled ballon to talk about pressure differentials and percieved gravity (49:00).
Found by tyler.arnold in Archimedes' Principle
August 15, 2012 at 09:24 PM
Ages: 16 - 18
License: Public Domain
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Billy helps you review Conservation of Mechanical Energy, springs, inclines, and uniformly accelerated motion all in one example problem. Want Lecture Notes? This is an AP Physics 1 topic.
Content Times:
0:10 The problem
0:38 Listing the known values
1:40 Using Conservation of Mechanical Energy
2:56 Canceling out the Mechanical Energies which are not there
4:18 Drawing the Free Body Diagram
4:52 Summing the forces in the perpendicular direction
5:26 Summing the forces in the parallel direction
6:59 Using Uniformly Accelerated Motion
7:56 Finding the maximum height Next Video: Work due to the Force of Gravity on an Incline by Billy. (04:49)
Found by Flipping Physics in Conservation of Energy
January 12, 2016 at 01:14 PM
Ages: 13 - 18
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Equations to memorize for the AP Physics 1 Exam.
Want Lecture Notes?
Content Times:
0:13 What I mean by “Memorize”
1:09 Speed, velocity and acceleration
1:51 Missing UAM Equation
2:03 Force of gravity on an incline
2:23 Mechanical Energy equations
2:58 Power
3:35 Conservation of Linear Momentum
3:57 Angular velocity, angular acceleration and 2 UαM equations
4:30 Tangential velocity and Rolling without Slipping center of mass velocity
5:05 Centripetal Force
5:26 Moment of Inertia
5:52 Conservation of Angular Momentum
6:21 Beat Frequency
6:31 Net charge
6:39 Electric Potential Difference
6:55 Electric Power
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Found by Flipping Physics in AP Physics 1
April 14, 2015 at 02:33 PM
Ages: 12 - 18
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An astronaut on the International Space Station observes how water behaves in zero-gravity. This really shows the surface tension of water with a good explanation of what is happening. (02:52)
Found by tyler.arnold in Properties of Water
August 16, 2012 at 08:22 PM
Ages: 12 - 18
License: Public Domain
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This video explains why bones get weaker with less gravity. It also describes how to prevent bone loss in space. The video explains how osteoclasts in our bodies eat away damaged/cracked bones and osteoblasts build the bone back up—a process known as remodeling. In space, this process is altered and osteoblasts do less building while osteoclasts eat away more bone. Scientists, doctors, and engineers are working hard to find ways to keep bones healthy in space. Exercise is an important countermeasure to help keep bones healthy in space. (5:52)
Found by TracyMoon in Structure of Bone
May 27, 2012 at 09:21 AM
Ages: 12 - 18
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An 8.53 kg pumpkin is dropped from a height of 8.91 m. What is the power delivered by the force of gravity (a) over the whole displacement of the pumpkin, (b) right after the pumpkin is dropped and (c) right before the pumpkin strikes the ground?
Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:16 The example
1:26 Visualizing the example
2:22 Part (a)
3:32 Solving for Δt
5:32 Alternate solution to part (a)
6:33 Average vs. Instantaneous Power Equations
7:45 Part (b)
8:12 Part (c)
Next Video: Graphing Instantaneous Power
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Previous Video: Introduction to Power
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Found by Flipping Physics in Power
May 21, 2016 at 04:39 PM
Ages: 11 - 18
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String Theory is a theory in particle physics that attempts to describe the reality of our Universe and bring together Quantum Mechanics and General Relativity. As we attempt to better comprehend the nature of space/time, some leading physicists believe that String Theory gives us our best shot at grasping the true physical makeup of our Universe. Many think that the leading current scientist working on String Theory is Edward Witten, and it seems only time will tell the truth value of this amazing and complex theory. Part 9 addresses the weakness of gravity and gravity as radiating gravitons in terms of closed ended loops and more. (06:55)
Found by begamatt in 11 Part Series from NOVA
January 30, 2011 at 12:13 PM
Ages: 13 - 18
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An 8.53 kg pumpkin is dropped from a height of 8.91 m. Will the graph of instantaneous power delivered by the force of gravity as a function of _____ be linear? If not, what would you change to make the graph linear? (a) Time, (b) Position.
Want Lecture Notes? This is an AP Physics 1 Topic.
Content Times:
0:12 The example
1:08 The equation for instantaneous power
1:43 Part (a): Solving for velocity as a function of time
2:55 Part (a): Solving for power as a function of time
3:23 Part (a): Is power as a function of time linear?
4:26 Part (a): Graphing power as a function of time
5:03 Part (b): Solving for velocity as a function of position
5:58 Part (b): Solving for power as a function of position
7:02 Part (b): Is power as a function of position linear?
7:38 Part (b): How can we make the graph linear?
8:33 Part (b): Graphing power squared as a function of position
Next Video: Average Power Delivered by a Car Engine - Example Problem
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Previous Video: Average and Instantaneous Power Example
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Found by Flipping Physics in Power
June 2, 2016 at 02:53 PM
Ages: 11 - 18
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