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But, what about more mundane problems where it seems to me=20
that it is much easier to consider the mass of the system to=20
be varying. Exampl=3D es include conveyor belts and=20
escalators, and the simple problem of keep=3D ing a hopper car=20
moving at constant velocity while it is moving under a grain=20
elevator that is dumping grain into it. F=3D3Ddp/dt works for=20
th=3D ose problems when you allow the mass vary.