Recent content by FelixISF

A quick hint'd suffice..

Homework Statement A binary star consists of two stars that are orbiting a common centre. The only force acting on the stars is the gravitational force of attraction in a direction along the line joining the stars. a) Explain carefully why the total momentum of the binary is constant...

thank you. that helped.

Rod is 1. pulled, 2. pushed horizontally. Force required to sustain constant vel.? Homework Statement There are 2 scenarios. 1. A rod of mass 5kg is first pulled at constant velocity by a force at 45° to the horizontal. 2. Then the same rod is pushed at constant velocity by a force at...

I tried to use the following equation: d = sqrt((x1-x2)^2+(y1-y2)^2+(z1-z2)^2), but it doesn't give me the right answer. whats wrong then ? thanks :)

I don't see your point. I have tried to solve the problem but didn't manage to do so, cause I can't find the right formulas. All I am asking for is the information on what formulas might be helpful. Do you expect me to write some attempt here, even if the wrong equations were used...

Homework Statement line l1 : x=2 y= -1 + p z= 2p line l2 : x=-1 + t y=1-3t z=1-2t Find the shortest (exact) distance between l1 and l2. Homework Equations That's what I am looking for! The Attempt at a Solution Thanks!

Thanks!

Homework Statement \frac{(cos60 - isin60)^5 * (cos45 - isin45)^3}{(cos15-isin15)^7} Homework Equations The Attempt at a Solution I have had several tries so far, but simply do not know what to do. Would somebody be so kind and simplify this expression step by step. I...

thanks, that made it clear for me!

The field points in the direction opposite of the movement of the proton and the force acts directly opposite to the movement right? That means, that if no force other than the electric force is acting on the proton, it will automatically accelerate towards lower potential right?

I don't see how you go from -kQ/r^2 to kQ/r... Apart from the mathematical relation ship of the field being the gradient of the potential, I don't get the intuition behind it. so field = -kQ/r^2 and potential = kQ/r Now, there must be a relation between potential and field with which you can...

Homework Statement Find the electric potential a distance of .5 x 10^-10 m from the proton of a hydrogen atom Homework Equations V= kQ/r The Attempt at a Solution I know how to answer the question, because I know which equation to use. What I do not understand is, where the...

I am only given a picture of lines of constant electric potential. the lines are all bent around some centre point and at various distanctes from the point. The highest potentials are near the point. The lowest are far away. Does that help ?

I am a bit confused, because I was trying to solve a question involving lines of constant electric potential and protons/electrons which move through this field. Now, I noticed that I do not know why protons do accelerate towards lower potential? Could somebody please explain the reasoning...