A non-conducting container filled with 25 kg of water at 20°C is fitted with a stirrer, which is made to turn by gravity acting on a weight of mass 35 kg. The weight falls slowly through 5 m in driving the stirrer. If all work done on the weight is transferred to the water and that the local acceleration of gravity is 9.8 m/s ?, determine: (a) The amount of work done on the water. (b) The internal energy change of the water. (c) The final temperature of the water, for which C, = 4.18 kJ/kg.°C.

A non-conducting container filled with 25 kg of water at 20°C is fitted with a stirrer, which is made to turn by gravity acting on a weight of mass 35 kg. The weight falls slowly through 5 m in driving the stirrer. If all work done on the weight is transferred to the water and that the local acceleration of gravity is 9.8 m/s ?, determine: (a) The amount of work done on the water. (b) The internal energy change of the water. (c) The final temperature of the water, for which C, = 4.18 kJ/kg.°C.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter3: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 82AP: Steam to drive an old-fashioned steam locomotive is supplied at a constant gauge pressure of 1.75106...

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A non-conducting container filled with 25 kg of water at 20°C is fitted with a stirrer, which is made to
turn by gravity acting on a weight of mass 35 kg. The weight falls slowly through 5 m in driving the
stirrer. If all work done on the weight is transferred to the water and that the local acceleration of
gravity is 9.8 m/s ², determine:
(a) The amount of work done on the water.
(b) The internal energy change of the water.
(c) The final temperature of the water, for which C, = 4.18 kJ/kg.°C.
(d) The amount of heat that must be removed from the water to return it to its initial temperature.
(e) The total energy change of the universe because of (1) the process of lowering the weight, (2) the
process of cooling the water back to its initial temperature, and (3) both processes together.

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