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Written by Nuntaya
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Monday, 02 April 2012 13:01 |
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ที่มา : www.youtube.com Upload by MIT
This lecture reviews selected concepts previously covered in lectures 16 through 24: one-dimensional collisions, simple harmonic oscillation (SHO) of a suspended rod, conservation laws for a satellite s orbit, the Doppler shift, and pure role.
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Buoyant Force and Bernoulli's Equation |
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Written by Nuntaya
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Monday, 02 April 2012 12:56 |
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ที่มา : www.youtube.com Upload by MIT
Concepts covered in this lecture include hydrostatics, Archimedes' Principle, fluid dynamics, and Bernoulli's Equation. The buoyant foce of air on a ballon is discussed, and then Professor Lewin demonstrates how a balloon and a pendulum behave in accelerated, closed containers. The lecture ends with some non-intuitive demos shoiing how ping pong balls behave in air streams.
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Written by Nuntaya
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Monday, 02 April 2012 12:45 |
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ที่มา : www.youtube.com Upload by MIT
In this lecture Processor Lewin introduces elasticity and Young's modulus. The fractional length deformation of a material (the strain) depends on the force per unit area (the stress). The stress vs. strain dependence is described conceptually, then explored empirically. The speed of sound in a material depends on the stiffness and density of the material; from this follows the fundamental frequency at which a rod resonates.
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Pressure in a Static Fluid |
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Written by Nuntaya
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Monday, 02 April 2012 12:53 |
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ที่มา : www.youtube.com Upload by MIT
Concepts covered in this lecture include gases and incompressible liquids, Pascal's Principle, hydrostatic and barometric pressure. Professor Lewins concludes with a discussion of overpressure in our lungs. The lung capacity, our ability to overcome hydrostatic pressure, is measured with a manometer. This is related to how deep snorkeling works, and why scuba-divers use pressurized air tanks. Professor Lewin demonstrates that by blowing on a manometer, or by sucking on it, we can raise or lower a column of water by about 1 meter (0.1 atmosphere). So why then was he able to suck fluid up a straw of several meters long?
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Written by Nuntaya
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Monday, 02 April 2012 12:41 |
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ที่มา : www.youtube.com Upload by MIT
Static equilibrium is covered in this lecture, achieved only when the net external force AND net external torque on an object are both zero. A ladder leaning against the wall is analyzed to determine the minimum angle it can make with the floor without sliding. Professor Lewin continues with the topic by discussing how to locate the center of mass of a rigid body. The center of mass always lines up below the point of suspenson such that the net torque is zero. He concludes by discussing the stability of a ropewalker, improved by lowering her center of mass below the rope.
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Page 17 of 30 |
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