Um ebulidor de resistência elétrica igual a 75,0W está envolto por 0,20 kg de gelo a 0 ºC. Os terminais do ebulidor são conectados a um gerador que fornece uma corrente elétrica de intensidade igual a 2 A, durante 1,4 minutos. Considere que toda energia dissipada pelo ebulidor foi integralmente absorvida pelo gelo. Considere, ainda, cágua= 4 J/g ºC e Lf(água) =320 J/g. Sobre esse evento físico, pergunta-se: a) Qual a energia elétrica total fornecida pelo gerador? b) Qual a temperatura final da água?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

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Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.