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A 610 kilogram elevator starts from rest and moves upward for 3.10 second with constant acceleration until it reaches its cruising speed, 1.66 m/s.
(a) Find the average power of the elevator motor during this period?
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(b) Find how does this amount of power compare with its power during an upright trip with constant speed?
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A thermos contains 153 cm3 of coffee at 93.9 °C. Tocool the coffee, you drop two 14.0-g ice cubes into the thermos. What is the final temperature of the coffee in degrees Celsius
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