Recent content by redoxes

I am afraid I could not agree with you, because under your assumption,there will be F(0)=C Which is not equal to zero at the fixed end, and this will make the rod fly off, so it sounds impossible. I would like to think: f+C=F=\frac{3f\lambda R^{2}}{2mR}=\frac{3}{2}f and therefore...

Yep, I have realized that I ignored the constraint force, but I still do not understand how to calculate the constraint force f',it is f'=3f/2-f=f/2, isn't it? Is there another way to calculate it ? I only learn a few thing about constraint force before. Constraint force can adjust to the...

I think ,at the fixed end ,the tangential component of resultant force dF is zero according to dF =\lambda dr \cdot \alpha r,which have included the constraint force.

There is a rod treating as rigid body, the rod which mass is m and lenghth is R rotate about one end of itself with the angular acceleration \alpha . Apply a tangential external force f on another end to make the rod rotate. Now divide the rod into elements of mass. For each mass element dm with...

Draw a circle in a paper, if the line of sight perpendular to the paper , we see a circle ,but if the line of sight is not perpendular to the paper, must we see an ellipse ? how to prove it ? how to find out the major axis or minor axis ? It seem that when we observe the circle ,it should be...