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Advances in Physics - download pdf or read online

By Alan Gladwell

ISBN-10: 9380168004

ISBN-13: 9789380168005

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Strain has no units, as it is a ratio between two lengths. Strain can be converted to a percentage by multiplying it by 100. Young's Modulus Young's Modulus is a measure of the stiffness of a material. , how much strain it will undergo) as a result of a given amount of stress. The formula for calculating it is: The values for stress and strain must be taken at as low a stress level as possible, provided a difference in the length of the sample can be measured. The unit of the Young's Modulus is Pascals, as strain has no units, so the units for stress are retained.

The ratios between the resistances are equal to the ratios between the potential differences. In other words, we can calculate the potential difference across a resistor using the formula: In many cases, you will be told to assume that the internal resistance of the power source is negligible, meaning that you can take the total potential difference as the EMF of the power source. A potential divider may work by combining a variable resistor such as an LDR or thermistor with a constant resistor, as in the diagram below.

5. What is the wavelength of green light? 6. The lowest frequency sound wave humans can hear has a frequency of approximately 20Hz. Given that the speed of sound in air is 343ms-1, what is the wavelength of the lowest frequency human-audible sound? Phasors Consider the image on the right. It shows a wave travelling through a medium. The moving blue dot represents the displacement caused to the medium by the wave. It can be seen that, if we consider any one point in the medium, it goes through a repeating pattern, moving up and down, moving faster the nearer it is to the centre of the waveform.

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Advances in Physics by Alan Gladwell

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