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.

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter14: Fluid Mechanics

Section: Chapter Questions

Problem 14.46P: Water falls over a dam of height h with a mass flow rate of R, in units of kilograms per second. (a)...

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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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