Recent content by PhysicsLord

Ok. So I'm not sure what You mean by which time. I assume that it's the proper time for the object on which the force is acting. In any case, any difference in parallel vs. perpendicular force shouldn't change anything when we consider the time since they would both be acting on the same...

Is it not the time derivative of momentum?

Homework Statement A particle flies along in the positive +x direction. It has a constant force F applied 30º clockwise to the x-axis. It is moving at .6 c. What is the angle of acceleration? Homework Equations a = F/(mγ3) The Attempt at a Solution [/B] I'm pretty sure I know how to do...

The answer is as follows: as the woman pushes harder and harder, the effect of gravity becomes less important overall, in proportion to her pushing, in deciding what happens to the box. As we approach this extreme point, or the limit, since mg <<< Fsinø, You can essentially take mg+Fsinø =...