If we have a solid cylinder, then the moment of inertia about this axis Q through the center of mass, which I've called Q, equals 1/2 MR squared.

假如有一个实心圆柱体，轴心的时间惯量,通过这个物质的中心，等于1/2，MR的平方。

youdao

Create new file 1280 x 1024 px. Create a rectangular selection in the center of the image, hit Q to enter quick mask mode.

建立一张1280*1024的白底画布.然后在画布中间用选框工具建立一个矩形选区 进入快速蒙版模式(Q).

youdao