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MIT OpenCourseWare  Electromechanical Dynamics
MIT OpenCourseWare Electromechanical Dynamics

... In this section we analyze the system of Fig. 13.2.1 which consists of a channel of constant cross-sectional area through which an electrically conducting gas flows with velocity v. The electrical conductivity is high enough to justify a quasi-static magnetic field model. The two walls perpendicular ...
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... as we have been doing) in order to find the net displacement over the entire time interval. In vector language, the individual displacements would be connected together head to tail and the net displacement, known as the resultant or vector sum, would be an arrow (of the correct length) with its tai ...
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newton`s second law of motion—force and acceleration
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... Friction is a force like any other force and affects motion. Friction acts on materials that are in contact with each other, and it always acts in a direction to oppose relative motion. When two solid objects come into contact, the friction is mainly due to irregularities in the two surfaces. When o ...
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... Use 2) for rock 1 (upward) and realize that y(t)=0 when the rock lands: 0 = 100 + 15t-0.5x9.81t2 t=6.27 s (quadratic equation, disregard negative answer) Use 2 for rock 2 (dropped) to find the time it takes to reach the ground 0=100 +0t -0.5x9.81t2 t=4.515 s. So if he drops rock 2 6.27-4.52=1.75 s l ...
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... the reflection coefficient can be expected to be exponentially small if the wavelength is much less than the plasma length, the reflected wavelets are themselves exponentiated due to the plasma instability. Thus it may still be possible that the reflection coefficient in the center of the device is ...
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... In the seventeenth century, the Danish astronomer Tycho Brahe modified the Ptolemaic system in order to harmonize it with that of Copernicus. For over two decades, he made numerous observations of the positions of stars and planets, but died before he could draw conclusions from his studies. ...
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... Newton's second law states that: The net force acting on a body is equal to the product of the body's mass and the acceleration produced by this force or ...
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... The Third Law is the fundamental principle behind the motion of a rocket. The Third Law is a statement of the conservation of momentum. Momentum is the quantity of an object that is its mass multiplied by its velocity. This quantity, like energy, must be conserved (cannot be changed in quantity) by ...
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Equations of motion

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