Вопрос
A bar of mass m slides down a smooth inclined plane. When the bar is lowered to a height h relative to its original position, its total mechanical energy a. decreases by mgh b. will not change c. will increase by the amount of mgh d. will not be known because the angle of inclination of the plane is not specified
Решения
4.1334 голоса
Григорий
элита · Репетитор 8 летЭкспертная проверка
Отвечать
The correct answer is b. will not change.<br /><br />The total mechanical energy of the bar is the sum of its kinetic energy and potential energy. Since the inclined plane is smooth, there is no friction to dissipate the mechanical energy. Therefore, the total mechanical energy of the bar remains constant as it slides down the inclined plane. The change in potential energy is equal to the change in kinetic energy, and the total mechanical energy remains the same.
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