Physics, 17.10.2019 10:00 dontcareanyonemo
An electric furnace is to melt 40 kg of aluminium/hour. the initial temperature of aluminium is 32°c. given that aluminium has specific heat capacity 950 j/kg k melting point 680*c, latent heat of fusion 450 kj/kg, the efficiency of furnace is 85% and cost of energy is 20 cents/kwhr calculate: (a) power required (b) the cost of operating the furnace for 30 hours
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Which type of circuit is becoming more common in residential electrical design and construction? a. hazardous-area circuit b. three-phase circuit c. 480-volt circuit d. communication circuit
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If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?
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Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?
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Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?
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An electric furnace is to melt 40 kg of aluminium/hour. the initial temperature of aluminium is 32°c...
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