Showing viewers that objects immersed in a liquid are buoyed up by a force equal to the weight of the liquid displaced, this program explains the principle of buoyancy.
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Wednesday, 3 August 2011
Tuesday, 2 August 2011
The Difference Between Mass and Weight
There is a common perception that weight and mass are basically the same thing. This video aims to tease out the difference between mass and weight by asking people what makes a car difficult to push. The standard answer is that it is difficult to push because it's heavy. But heaviness is a measure of weight, the gravitational pull of the Earth attracting the car to Earth's center. When the car is pushed on a flat road, the force of gravity does not oppose the motion. Instead the resistance felt is an indication of the car's mass which determines its inertia. Inertia is the property of matter that means it tends to resist acceleration - the greater the mass, the less the acceleration for a given amount of force.
Other Veritasium videos
Other Veritasium videos
Julius Sumner Miller - Pascal Principle
Sciences demonstrations #14: Pascal Principle
Pascal principle, hydraulic press...
Other physics demonstrations by Julius Sumner Miller
Pascal principle, hydraulic press...
Other physics demonstrations by Julius Sumner Miller
Monday, 1 August 2011
Degrees of Angle - Sixty Symbols
We look at astronomy and nanotechnology in this film about angles, focusing especially on the tilt of the Earth's axis and the pole star (aka polaris). More at http://www.sixtysymbols.com/
Other Sixty Symbols videos
Other Sixty Symbols videos
Yale: Frontiers and Controversies in Astrophysics, Lecture 16
Source: Yale University, Open Yale Courses
Lecture 16: Hubble's Law and the Big Bang
The third and final part of the course begins, consisting of a series of lectures on cosmology. A brief history of how cosmology developed into a scientific subject is offered. The discovery of dark energy, along with dark matter, played a crucial role in the development of cosmology. The lecture then discusses the discovery of spiral nebulae in 1920, as well as the "Great Debate" over what they were. Hubble's famous redshift diagram is presented as the basis for Hubble's Constant and Big Bang cosmology. The difficulty of measuring distance of objects in space, and how to do it using the parallax method and the standard candle method, are discussed. Measure brightness using the magnitude scale is explained. Class ends with a review of logarithms.
00:00 - Chapter 1. Introduction to Cosmology
03:34 - Chapter 2. Spiral Nebulae and Hubble's Redshift Diagram
17:35 - Chapter 3. Measuring the Distance of a Star: The Parallax Method
25:13 - Chapter 4. Measuring Brightness: The Standard Candle Method
38:06 - Chapter 5. Absolute and Apparent Magnitude
48:04 - Chapter 6. Conclusion
Other lectures from this course
Lecture 16: Hubble's Law and the Big Bang
The third and final part of the course begins, consisting of a series of lectures on cosmology. A brief history of how cosmology developed into a scientific subject is offered. The discovery of dark energy, along with dark matter, played a crucial role in the development of cosmology. The lecture then discusses the discovery of spiral nebulae in 1920, as well as the "Great Debate" over what they were. Hubble's famous redshift diagram is presented as the basis for Hubble's Constant and Big Bang cosmology. The difficulty of measuring distance of objects in space, and how to do it using the parallax method and the standard candle method, are discussed. Measure brightness using the magnitude scale is explained. Class ends with a review of logarithms.
00:00 - Chapter 1. Introduction to Cosmology
03:34 - Chapter 2. Spiral Nebulae and Hubble's Redshift Diagram
17:35 - Chapter 3. Measuring the Distance of a Star: The Parallax Method
25:13 - Chapter 4. Measuring Brightness: The Standard Candle Method
38:06 - Chapter 5. Absolute and Apparent Magnitude
48:04 - Chapter 6. Conclusion
Other lectures from this course
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