Physics Preliminary 8.2 The World Communicates 1. The wave model can be used to explain how current technologies transfer information 1. Describe the energy transformations required in one of the following: – Mobile telephone – Fax/modem – Radio and television A. An energy transformation is a change in the type of energy‚ for example a change from sound energy to electromagnetic waves. Relating this to the mobile telephone‚ it undergoes basic energy transformations of‚ sound wave
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two or more plane surfaces. A familiar example is the triangular prism‚ usually made of glass‚ used to split beam of white light into its component colors. When light is refracted through a prism it is dispersed into its constituent colors‚ and the angle at which the light emerges from the prism depends upon its wavelength. A prism spectrometer can be used to measure the
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axis of symmetry it will strike the parabola and reflect toward the focus. You can see heavy black line segments drawn on the parabola on the lines tangent to the parabola at the points of incidence. Two angles are formed between each of these segments and the light striking and bouncing off; each pair of angles are equal and depend upon the location the light hits the parabola. Imagine the focus is a light bulb and the parabola a mirror. The light bulb emits light in all directions. All
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Mechanics 3-Aerofoil Lab Report Introduction This report aims to investigate the effect the angle of attack of an aerofoil has on the air flow around it. This was done by recording the lift and drag forces the aerofoil experienced when positioned at different angles of attack. The experimental lift force the aerofoil experienced when positioned at different angles of attack was then compared with theoretical values. An attempt was made to explain any discrepancies between experimental
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An aircraft that has elevons (combined ailerons and elevators) e.g.‚ Concorde is governed by slightly different equations. The effect of the tab angle is usually ignored as most tailless aircraft have powered controls and so no tabs. The lift equation therefore becomes Moments about the cg give us: For TRIM‚ the elevon angle to trim is [pic] For STABILITY it is clear that the aerodynamic centre is also the neutral point for a tailless aircraft (hn = h0 and Kn = h0-h)
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typically about 2m. Edge effects are usually small. The transmittance () of a glass cover for solar radiation depends on the angle of incidence . Typical values for clear glass are given in Table 1. Table 1. Transmittance of a Glass Cover. : 0° 60° 70° 80° 90° (): 0.9 0.8 0.65 0.35 0 The absorptance () of the black plate for solar radiation also depends on the angle of incidence . Table 2 shows typical values for () and the product ().(). Table 2. Absorptance of a Black Plate. : 0° 60° 70° 80° 90° ():
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Background P. elliottii x P. caribaea is a fast growing tree‚ with a good stem form and good branching characteristics. The hybrid produces a stable wood with mature wood properties comparable to or better than those of commercial species such as P. patula‚ P. elliottii and P. taeda. (Malan‚ 2002). Both the parent species used to create this hybrid unfortunately are known to from resin-related defects. It is thus expected that this hybrid suffers from the same resin related defects and there appear
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Chapter 13 – States of Matter Pressure (P) – the amount of force per unit area. Pressure=F/a or P=F/a Pascal’s Principle “Any change in pressure at a point on a confined fluid is transmitted throughout the fluid”. Any change is transmitted throughout the fluid. Buoyancy & Archimedes Principle “When an object is submerged in a fluid‚ it displaces a certain volume of that fluid. The amount of force pushing upward on the object is equal to the density of the fluid (Ï) times the acceleration
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SCIENCE EXAM NOTES Organ Systems CELL - Cell Membrane : surrounds the cytoplasm in the plant cell and surrounds the cell in the animal cell - Cell Wall : surrounds Cell - Chloroplast : type of organelle in the plant cell ; Conducts photosynthesis - Golgi Apparatus : modifies‚ sorts‚ and packages proteins and other materials from the cellular endoplasmic reticulum - Mitochondrion : produces energy - Nucleus : regulates all cell activity - Nucleolus : contains the DNA of a cell - Vacuole
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Altitude of the sun affects insolation because as the angle of the sun in the sky decreases and becomes more oblique‚ the land area to be heated up by the rays and the depth of atmosphere they must travel through increase. Therefore the amount of insolation lost through absorption‚ scattering and reflection increases. Areas in lower latitudes have higher temperatures than those in higher latitudes‚ because the sun is at a higher angle of incidence. One might expect the highest amount of insolation to
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