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Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?
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Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(mโ
k), and the styrofoam has k= 0.010 w/(mโ
k). the interior surface temperature is 19.0 โc , and the exterior surface temperature is -15.0 โc . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2
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Physics, 22.06.2019 21:00
What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%
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Two positive charges are equal. which has more electric potential energy?
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A fish swimming at a speed of 0.5m/s suddenly notices a shark appear behind it. Five seconds later,...
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