在下列物理现象或者物理过程中,机械能守恒的是(        ) A

在下列物理现象或者物理过程中,机械能守恒的是(        )

A.匀速下落的降落伞                  B.沿斜面匀速上行的汽车

C.细绳拴着的小球在光滑的水平桌面上做匀速圆周运动

D.在水中下沉的石头

答案

C

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