Aball of mass 24.6 g is attached to a cord of length 0.434 m and rotates in a vertical circle. what is the minimum speed the ball must have at the top of the circle so the cord does not become slack? the acceleration of gravity is 9.8 m/s 2 . answer in units of m/s.
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A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m
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Sobre transformações cÃclicas, são feitas algumas afirmações, determine quais estão corretas. i – a variação de energia interna em uma transformação cÃclica é nula; ii – o trabalho, em uma transformação cÃclica, é sempre positivo; iii – ao completar um ciclo, o gás tem a mesma temperatura com a qual começou a transformação; iv – uma transformação cÃclica é, obrigatoriamente, composta de transformações conhecidas, como adiabática, isocórica, 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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Aball of mass 24.6 g is attached to a cord of length 0.434 m and rotates in a vertical circle. what...
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