A closed bottle contains some liquid. the bottle is shaken vigorously for 5 minutes. It is found that the temperature of the liquid is increased. Is heat transferred to the liquid? Is work done on the liquid? Neglect expansion on heating.
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Explanation:
A closed container containing any liquid is shook violently, so that the bottle (against viscous force) is handled. Therefore, the liquid temperature increases. Nevertheless, the machine does not receive any external power.
Work done: -
Work performed on a device by a constant force is defined as the product of the force variable in the direction of motion times the distance through which the force operates.
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