Post a problem from your homework and I'll use retarded logic to solve it and I'll give you the worst answer possible.
Edit: keep the home work coming!
Edit: over 100 replies thanks for your support of this thread!
Edit: after rereading I have missed a lot of homework so I apologize for that, however you guys can also answer each other's questions as well.
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A long cart moves at relativistic speed v. Sand is dropped into the cart at a rate dm/dt = σ in the ground frame. Assume that you stand on the ground next to where the sand falls in, and you push on the cart to keep it moving at constant speed v. What is the force between your feet and the ground? Calculate this force in both the ground frame (your frame) and the cart frame, and show that the results are equal (as should be the case for longitudinal forces). Good luck