(a)The angular speed of a ceiling fan is increased uniformly in 3.0 s from 180 revs/min to 290 revs/min. What is the angular displacement of the blades during the acceleration?
(b) 25 g of copper at 430 K is mixed with 150 mL of water 290 K. Assuming energy is exchanged only between the copper and water, what is the final temperature of the mixture? The specific heats of copper and water are respectively 386 /kg.k and 4186 /kg.k
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