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Physics, 22.06.2019 09:00, cmflores3245
Sobre transformações cĂclicas, sĂŁo feitas algumas afirmações, determine quais estĂŁo corretas. i – a variação de energia interna em uma transformação cĂclica Ă© nula; ii – o trabalho, em uma transformação cĂclica, Ă© sempre positivo; iii – ao completar um ciclo, o gás tem a mesma temperatura com a qual começou a transformação; iv – uma transformação cĂclica Ă©, obrigatoriamente, composta de transformações conhecidas, como adiabática, isocĂłrica, etc: a) i e iii b) i e ii c) ii e iii d) i e iv e) iii e iv
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Physics, 22.06.2019 12:00, P4thing
Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?
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Physics, 22.06.2019 12:30, lanaasad7733
An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.
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