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Physics, 22.06.2019 09:00, cmflores3245
Sobre transformaçáes cΓclicas, sΓ£o feitas algumas afirmaçáes, determine quais estΓ£o corretas. i β a variação de energia interna em uma transformação cΓclica Γ© nula; ii β o trabalho, em uma transformação cΓclica, Γ© sempre positivo; iii β ao completar um ciclo, o gΓ‘s tem a mesma temperatura com a qual comeΓ§ou a transformação; iv β uma transformação cΓclica Γ©, obrigatoriamente, composta de transformaçáes conhecidas, como adiabΓ‘tica, isocΓ³rica, 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 22:30, nickocasamplonp6mlob
The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaΟv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and Ο is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and Ο = 1.2 kg/m3.
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