力学 - 质点系

There is a nicer way to write this:m,r +mr+mr +..coMm +m, +m +

. . 1 2 3 1 1 2 2 3 3 COM + + + + + + = m m m m r m r m r r     There is a nicer way to write this:

There is a nicer way to write this:NZm,ri1cOMNZm;i=1“The sum (总和) from i= 1 to N of

  = = = N i i N i i i m m r r 1 1 COM   There is a nicer way to write this: “The sum (总和) from i = 1 to N of

There is a nicer way to write this:NZm,ri=1rcoM =Mwhere M is the total mass (总质量)of the system

M m r r N i  i i = = 1 COM   There is a nicer way to write this: where M is the total mass (总质量) of the system