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When a metal is heated its density decreases. There are two sources that give rise to this diminishment of ρ: (1) the thermal expansion of the solid, and (2) the formation of vacancies. Consider a specimen of gold at room temperature (20?C) that has a density of 19.320 g/cm3.
(a) Determine its density upon heating to 800oC when only thermal expansion is considered.
(b) Repeat the calculation when the introduction of vacancies is taken into account. Assume that the energy of vacancy formation is 0.98 eV/atom, and that the volume coefficient of thermal expansion, αv is equal to 3αl.
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A particular inductor has appreciable resistance. When the inductoris connected to a 11.5 V battery, the current in the inductor is4.54 A. When it is connected to AC source with an rms output of11.5 V and a frequency of 69 Hz, the current drops to..
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find the maximum height reached by a body of mass 5 kg thrown with a speed of 10 m/s. take g= 10 m/s^2. find also the work done in reaching that height
A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. calculate the work done on the bag
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