Hi!! I am really bad in physics, therefore could you help me please? What is the differential equation that fits the following physical description: The velocity at time t of a particle moving along a straitgh line is proportional to the fourth power of its position x. Thank you!!!

First, this is in the wrong forum. You should have posted it in the Math & Physics forum. Second, the fact that you say this problem is "urgent" leads me to believe this is homework. Which means you shouldn''t be posting this anywhere. If it isn''t homework, please explain what you are doing(and do that in the physics forum), please.

I''m the previous AP. I don''t know why, but I thought this was the For Beginners forum. Ignore the above post as the piece of stupidity it is.

Lucie,

I''m very sorry, but homework/school questions of this sort are against forum policy. I''m closing the thread. Please review forum policy on homework here:

Forum FAQ

The only time a homework question is acceptable is when the poster shows her or his own work in some detail in the original post, so that forum participants (and myself as moderator) can be reasonably sure that the poster is actually trying to solve the problem on their own and not merely trying to obtain an answer for free without doing any work. And in that case, the only truly acceptable replies are not answers, but suggestions and hints about how the poster can proceed to solve the problem on their own.

I will give you a hint about your problem. Why not start out by writing out the exact equation that is described by the problem statement, and then substitute the differential equation that represents the relationship between velocity and x?

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.